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Hass Avocado Composition and Potential Health Effects
Mark L. Dreher a & Adrienne J. Davenport b
a Nutrition Science Solutions, LLC , Wimberly , TX , 78676 , USA
b No affiliation
Accepted author version posted online: 03 Feb 2012.Published online: 02 May 2013.
To cite this article: Mark L. Dreher & Adrienne J. Davenport (2013): Hass Avocado Composition and Potential Health Effects,
Critical Reviews in Food Science and Nutrition, 53:7, 738-750
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ISSN: 1040-8398 / 1549-7852 online
DOI: 10.1080/10408398.2011.556759
Hass Avocado Composition
and Potential Health Effects
MARK L. DREHER1and ADRIENNE J. DAVENPORT2
1Nutrition Science Solutions, LLC, Wimberly, TX 78676, USA
2No affiliation
Hass avocados, the most common commercial avocado cultivars in the world, contain a variety of essential nutrients and
important phytochemicals. Although the official avocado serving is one-fifth of a fruit (30 g), according to NHANES analysis
the average consumption is one-half an avocado (68 g), which provides a nutrient and phytochemical dense food consisting
of the following: dietary fiber (4.6 g), total sugar (0.2 g), potassium (345 mg), sodium (5.5 mg), magnesium (19.5 mg),
vitamin A (43 μg), vitamin C (6.0 mg), vitamin E (1.3 mg), vitamin K1(14 μg), folate (60 mg), vitamin B-6 (0.2 mg), niacin
(1.3 mg), pantothenic acid (1.0 mg), riboflavin (0.1 mg), choline (10 mg), lutein/zeaxanthin (185 μg), phytosterols (57 mg),
and high-monounsaturated fatty acids (6.7 g) and 114 kcals or 1.7 kcal/g. The avocado oil consists of 71% monounsaturated
fatty acids (MUFA), 13% polyunsaturated fatty acids (PUFA), and 16% saturated fatty acids (SFA), which helps to promote
healthy blood lipid profiles and enhance the bioavailability of fat soluble vitamins and phytochemicals from the avocado or
other fruits and vegetables, naturally low in fat, which are consumed with avocados. There are eight preliminary clinical
studies showing that avocado consumption helps support cardiovascular health. Exploratory studies suggest that avocados
may support weight management and healthy aging.
Keywords Fruit, monounsaturated fat, cardiovascular health, normal blood glucose, weight control, healthy aging
INTRODUCTION
The avocado (Persea americana) originated in Mexico,
Central or South America, and was first cultivated in Mexico
as early as 500 BC (Duester, 2000; Rainey et al., 1994; Cali-
fornia Avocado Commission, 2011). The first English language
mention of avocado was in 1696. In 1871, avocados were first
introduced to the United States in Santa Barbara, California,
with trees from Mexico. By the 1950s, there were over 25 avo-
cado varieties commercially packed and shipped in California,
with Fuerte accounting for about two-thirds of the production.
As the large-scale expansion of the avocado industry occurred
in the 1970s, the Hass avocado cultivar replaced Fuerte as the
leading California variety and subsequently became the primary
global variety. The Hass avocado contains about 136 g of pleas-
ant, creamy, smooth texture edible fruit covered by a thick dark
green, purplish black, and bumpy skin. The avocado seed and
skin comprise about 33% of the total whole fruit weight (USDA,
2011). Avocados are a farm-to-market food; they require no
Address correspondence to Dr. Mark Dreher, PhD, Nutrition Science Solu-
tions LLC, 900 S. Rainbow Ranch Road, Wimberley, TX 78676, USA. E-mail:
nss3@sbeglobal.net
processing, preservatives or taste enhancers. The avocado’s nat-
ural skin eliminates the need for packaging and offers some
disease and insect resistance, which allows them to be grown
in environmentally sustainable ways. This review provides the
first comprehensive literature summary of the published nutri-
tion and health research related to the avocado and its major
components.
HASS AVOCADO COMPOSITION
Avocado consumers tend to consume significantly more of
key shortfall nutrients—dietary fiber, vitamins K, and E, potas-
sium, and magnesium—in their diet than non-avocado con-
sumers (Fulgoni et al., 2010a). Although the U.S. Nutrition
Labeling and Education Act (NLEA) defines the serving size
of an avocado as one-fifth of a fruit, or 30 g (1 ounce), the
National Health and Nutrition Examination Survey (NHANES)
2001–2006 finds that the average consumption is one-half an
avocado (approximately 68 g) (Fulgoni et al., 2010a; 2010b).
The nutrition and phytochemical composition of Hass avocados
is summarized in Table 1. One-half an avocado is a nutrient and
phytochemical dense food consisting of the following: dietary
fiber (4.6 g), total sugar (0.2 g), potassium (345 mg), sodium
738
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HASS AVOCADO COMPOSITION AND POTENTIAL HEALTH EFFECTS 739
Tab le 1 Hass avocados (Persea americana) composition of edible portion (USDA, 2011)
Value per 1 fruit, 1/2 fruit, 68 g 1 serving, 30 g
Nutrient/phytochemical 100 g 136 g (NHANES eating occasion) (NLEA serving)
Proximates
Water (g) 72.3 98.449.221.7
Energy (kcal) 167 227 114 50.0
Energy (kcal) (insoluble fiber adjusted) 148 201 101 44.0
Protein (g) 1.96 2.67 1.34 0.59
Total lipid (fat) (g) 15.4 21.010.54.62
Ash, g 1.66 2.26 1.13 0.50
Carbohydrate, by difference (g) 8.64 11.85.90 2.59
Fiber, total dietary (g) 6.80 9.20 4.60 2.00
Sugars, total (g) 0.30 0.41 0.21 0.09
Starch (g) 0.11 0.15 0.08 0.03
Minerals
Calcium (mg) 13.0 18.09.04.0
Iron (mg) 0.61 0.83 0.42 0.18
Magnesium (mg) 29.039
.019.59.0
Phosphorus (mg) 54.0 73.036.516.0
Potassium (mg) 507 690 345 152
Sodium (mg) 8.0 11.05.52.0
Zinc (mg) 0.68 0.92 0.46 0.20
Copper (mg) 0.17 0.23 0.12 0.05
Manganese (mg) 0.15 0.20 0.10 0.05
Selenium (ug) 0.40 0.50 0.25 0.10
Vitamins and Phytochemicals
Vitamin C (mg) 8.80 12.06.02.60
Thiamin (mg) 0.08 0.10 0.05 0.02
Riboflavin (mg) 0.14 0.19 0.09 0.04
Niacin (mg) 1.91 2.60 1.30 0.57
Pantothenic acid (mg) 1.46 2.00 1.00 0.44
Vitamin B-6 (mg) 0.29 0.39 0.19 0.09
Folate, food (μg) 89.0 121 60.527.0
Choline, total (mg) 14.2 19.39.65 4.30
Betaine (mg) 0.71.00.50.2
Vitamin B-12 (μg) 0.00.00.00.0
Vitamin A (μgRAE) 7.0 10.05.02.0
Carotene, beta (μg) 63.0 86.043.019.0
Carotene, alpha (μg) 24.0 33.016.57.0
Cryptoxanthin, beta (μg) 27.0 37.018.58.0
Lutein +zeaxanthin (μg) 271 369 185 81.0
Vitamin E (alpha-tocopherol),mg 1.97 2.68 1.34 0.59
Tocopherol, beta (mg) 0.04 0.05 0.03 0.01
Tocopherol, gamma (mg) 0.32 0.44 0.22 0.10
Tocopherol, delta (mg) 0.02 0.03 0.02 0.01
Vitamin K1(phylloquinone) (μg) 21.0 28.614.36.30
Lipids
Fatty acids, total saturated (g) 2.13 2.90 1.45 0.64
16:0 (g) 2.08 2.82 1.41 0.62
Fatty acids, total monounsaturated (g) 9.80 13.36.65 2.94
18:1 (g) 9.07 12.36.15 2.71
Fatty acids, total polyunsaturated (g) 1.82 2.47 1.24 0.55
18:2 (g) 1.67 2.28 1.14 0.50
18:3 (g) 0.13 0.17 0.09 0.04
Cholesterol (mg) 0 0 0 0
Stigmasterol (mg) 2.03.01.51.0
Campesterol (mg) 5.07.03.52.0
Beta-sitosterol (mg) 76.0 103 51.523.0
(5.5 mg), magnesium (19.5 mg), vitamin A (5.0 μg RAE), vita-
min C (6.0 mg), vitamin E (1.3 mg), vitamin K1(14 μg), folate
(60 mg), vitamin B-6 (0.2 mg), niacin (1.3 mg), pantothenic acid
(1.0 mg), riboflavin (0.1 mg), choline (10 mg), lutein/zeaxanthin
(185 μg), cryptoxanthin (18.5 μg), phytosterols (57 mg), and
high-monounsaturated fatty acids (6.7 g) and 114 kcals or 1.7
kcal/g (after adjusting for insoluble dietary fiber), which may
support a wide range of potential health effects (USDA, 2011;
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740 M. L. DREHER AND A. J. DAVENPORT
Tab le 2 Composition: Avocado compared to tree nut qualified health claims reference amount (edible portion) (USDA, 2011)
Hass avocado Almonds 1.5 oz Pistachios 1.5 oz Walnuts 1.5 oz
Nutrient 1 fruit (136 g) (42.5 g) (42.5 g) (42.5 g)
Water (g) 98.41.10.81.7
Calories (kcal) 227 254 240 278
Calories (kcal) (insoluble fiber adjusted) 201 239 235 269
Total fat (g) 21.022.1 19.127.7
Monounsaturated fat (g) 13.313.8 10.13.8
Polyunsaturated fat (g) 2.55.55.720
Saturated fat (g) 2.91.72.32.6
Protein (g) 2.79.09.06.5
Total Carbohydrate (g) 11.89.0 12.25.8
Dietary fiber (g) 9.24.64.22.9
Potassium (mg) 690 303 450 188
Magnesium (mg) 39.0 120 48 68
Vitamin C (mg) 12.00.01.40.6
Folate (mcg) 121 23 21 42
Vitamin B-6 (mg) 0.40.05 0.50.2
Niacin (mg) 2.61.50.60.5
Riboflavin (mg) 0.20.40.10.06
Thiamin (mg) 0.10.04 0.30.15
Pantothenic acid (mg) 2.00.10.20.2
Vitamin K (ug) 28.60.06.31.2
Vitamin E (α-Tocopherol) (mg) 2.710.10.90.3
γ-Tocopherol (mg) 0.44 0.39.08.9
Lutein +zeaxanthin (ug) 369 0.0 494 4.5
Total phytosterols (mg) 113 54 123 30
ADA, 2009). Avocados contain an oil rich in monounsaturated
fatty acids (MUFA) in a water based matrix, which appears to
enhance nutrient and phytochemical bioavailability and masks
the taste and texture of the dietary fiber (USDA, 2011; Unlu
et al., 2005). Avocados’ are a medium energy dense fruit be-
cause about 80% of the avocado edible fruit consists of water
(72%) and dietary fiber (6.8%) and has been shown to have sim-
ilar effects on weight control as low-fat fruits and vegetables
(USDA, 2011; Bes-Rastrollo et al., 2008). An analysis of adult
data from the NHANES 2001–2006 suggests that avocado con-
sumers have higher HDL-cholesterol, lower risk of metabolic
syndrome, and lower weight, BMI, and waist circumference
than nonconsumers (Fulgoni et al., 2010b). One avocado fruit
(136 g) has nutrient and phytochemical profiles similar to 1.5
ounces (42.5 g) of tree nuts (almonds, pistachios, or walnuts),
which have qualified heart health claims (FDA, 2003; 2004;
USDA, 2011; and USDA and HHS, 2010b) (Table 2).
THE ROLE OF AVOCADO IN CARDIOVASCULAR
HEALTH
Avocado Clinical Studies
There are eight preliminary avocado cardiovascular clinical
trials summarized in Table 3 (Grant, 1960; Colquhoun et al.,
1992; Alvizouri-Munoz et al., 1992; Lerman-Garber et al., 1994;
Carranza et al., 1995; Lopez-Ledesma et al., 1996; Carranza-
Madrigal et al., 1997; Pieterse et al., 2005).
The first exploratory avocado clinical study demonstrated
that the consumption of 0.5–1.5 avocados per day may help to
maintain normal serum total cholesterol in men (Grant, 1960).
Half the subjects experienced a 9–43% reduction in serum to-
tal cholesterol and the other subjects (either diabetic or very
hypercholesterolemic) experienced a neutral effect, but none of
the subjects showed increased total cholesterol. Also, the sub-
jects did not gain weight when the avocados were added to their
habitual diet.
In the 1990s, a number of avocado clinical trials consis-
tently showed positive effects on blood lipids in a wide variety
of diets in studies on healthy, hypercholesterolemic, and type
2 diabetes subjects (Colquhoun et al., 1992; Alvizouri-Munoz
et al., 1992; Lerman-Garber et al., 1994; Carranza et al., 1995;
Lopez-Ledesma et al., 1996; Carranza-Madrigal et al., 1997).
In hypercholesterolemic subjects, avocado enriched diets im-
proved blood lipid profiles by lowering LDL-cholesterol and
triglycerides and increasing HDL-cholesterol compared to high
carbohydrate diets or other diets without avocado. In normolipi-
demic subjects, avocado enriched diets improved lipid profiles
by lowering LDL-cholesterol without raising triglycerides or
lowering HDL-cholesterol. These studies suggest that avocado
enriched diets have a positive effect on blood lipids compared
to low-fat, high carbohydrate diets or the typical American diet.
However, since all these trials were of a small number of sub-
jects (13–37 subjects) and limited duration (1–4 weeks), larger
and longer term trials are needed to confirm avocado blood lipid
lowering and beyond cholesterol health effects.
In a randomized crossover study of 12 women with type
2 diabetes, a monounsaturated fat diet rich in avocado was
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HASS AVOCADO COMPOSITION AND POTENTIAL HEALTH EFFECTS 741
Tab le 3 Avocado cardiovascular health clinical overview
Conclusions Methods Results References
Daily addition of California avocados
to the habitual diet showed a
beneficial effect on total cholesterol
(TC) and body weight control
(Preliminary, uncontrolled study)
- Open label study for 4 weeks (n=16)
- Normal/hypercholesterolemic male patients
in Veteran’s Administration Hospital
- 27–72 yrs old
- 0.5–1.5 California avocados per day in
addition to habitual diet
- 1/2 subjects had significantly lowered total
cholesterol (TC) by 9–43%
- 1/2 subjects had unchanged TC
- No subjects had increased TC
- 3/4 of subjects lost weight or remained weight
stable despite an increase intake of calories
and fat
- Generally the subjects had a more regular
bowel movement pattern
Grant, 1960
An avocado enriched diet (AE) was
more effective than the AHA III diet
in promoting heart healthy lipid
profiles in women
(Limited number of subjects and short
duration)
- Randomized, crossover study for 3 weeks
(n=15)
- Females w/ baseline total cholesterol
(4–8 mm/L)
- 37–58 years old
- 66.8 ±0.8 kg body weight
- Two diets:
(1) High MUFA primarily avocado diet (AE)
or
(2) High in complex carbohydrates low-fat
diet (AHA III)
- Both diets decreased total cholesterol (TC)
compared to baseline
- Avocado diets were more effective in
decreasing TC 8.2% vs. 4.9%
- LDL-C decreased (p<0.05) on AE but not
AHA III diet
- HDL-C did not change on AE but decreased
by 13.9% on the AHA III (p<0.01)
Colquhoun et al.,
1992
Avocado enriched diets can help avoid
potential adverse effects of low-fat
diets on HDL-C and triglycerides
(Well designed study but limited
number of subjects and short
duration)
- Randomized, crossover study for 2 weeks
(n=16)
- Healthy subjects baseline total cholesterol
4.2 ±0.68 mm/L; mean age 26 years;
mean BMI 22.9
- Four diets:
(1) Control, typical diet
(2) MUFA fat diets with avocado (75% from
Hass Avocados) (RMF)
(3) Habitual diet plus same level of Hass
avocados as (2) (FME)
(4) Low-saturated diet (LSF)
- Both RMF and LSF diets had similar
reductions in total cholesterol (TC) and
LDL-C
- Both FME and LSF diets had significantly
lower TC, LDL-C and HDL-C (p<0.05)
- RMF and FME diets lowered triglycerides
(TG) and the LSF diet had significantly
increased TG levels (p<0.05)
Alvizouri-Munoz
et al., 1992
Partial replacement of avocados for
other dietary fats in patients with
type 2 diabetes favorably affected
serum lipid profile and maintained
adequate glycemic control
(Well designed study but limited
number of subjects)
- Randomized, crossover study for 4 weeks
(n=12)
- Women with type 2 diabetes; mean 56 ±
8 years; BMI 28 ±4
- Three diets
(1) Control, American Diabetes Diet plan;
30% kcal from fat (ADA)
(2) High MUFA diet with 1 avocado (Hass)
and 4 teaspoons of olive oil; 40% kcal
from fat (HMUFA)
(3) High in complex carbohydrates 20% Kcal
from fat (High-CHO)
- Both HMUFA and High-CHO diets had a
minor hypo-cholesterolemic effect with no
changes in HDL-C
- HMUFA diet was associated with a greater
decrease in triglycerides (20 vs. 7% for
High-CHO)
- Glycemic control was similar for both
HMUFA and High CHO diets
Lerman-Garber
et al., 1994
Diets rich in avocados appear to help
manage hyper-cholesterolemia
(Well designed study but limited
number of subjects and level of
avocado consumption very high)
- Randomized crossover for study 4 weeks
with a controlled diet (n=16)
- Hyper-cholesterolemic subjects with
phenotype II and IV dyslipidemias
- Two diets:
(1) Avocado rich diet (75% fat from
avocado) diet
(2) Low-saturated fat diet
The Avocado diet had significantly lowered
total cholesterol, LDL-C levels, and
increased HDL-C with a mild decrease in
triglycerides compared the low-saturated fat
diet plan
Carranza et al.,
1995
Avocado-enriched diets had
significantly improved lipoprotein
and/or triglyceride profiles in
normal and hyper-cholesterolemic
subjects
(Complex clinical design and very
short duration)
- Randomized, controlled study for 7 days
(n=67)
(1) Healthy normo-lipidemic subjects
(<200 mg/dL)
(2) Mild hyper-cholesterolemia and type 2
diabetic patients (201–400 mg/dL)
- Enriched avocado diet vs. isocaloric
non-avocado diets. 300 g Hass Avocado
substituted for other lipid sources (both
diets contained about 50% kcal from fat
- Subjects with normal cholesterol had a 16%
decrease in serum total cholesterol following
avocado diets vs. an increase in total
cholesterol with the control (p<0.001)
- Subjects with elevated cholesterol had
significant decrease (p<0.001) total serum
cholesterol (17%), LDL-C (22%),
triglycerides (22%), and a slight increase in
HDL-C
- No changes with the non-avocado habitual diet
Lopez-Ledesma
et al., 1996
(Continued on next page)
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742 M. L. DREHER AND A. J. DAVENPORT
Tab le 3 Avocado cardiovascular health clinical overview (Continued)
Conclusions Methods Results References
Vegetarian diets with avocados
promote healthier lipoprotein
profiles compared to low-fat and
vegetarian diets without avocados
(Preliminary study with limited
number of subjects)
- Randomized, prospective, transversal and
comparative 4 week study and controlled
diet (n=13)
- Dyslipidemic subjects with high blood
pressure
- Three vegetarian diets:
(1) 70% carbohydrate, 10% protein and 20%
lipids
(2) 60% carbohydrates, 10% protein and 30%
lipids (75% of the fat from Hass avocados)
(3) Diet 2 w/o avocado
The avocado diet significantly reduced
LDL-C, whereas high carbohydrate and
non-avocado diets did not change LDL-C
Carranza-
Madrigal et al.,
1997
The consumption of as much as 1 1/2
avocados within an
energy-restricted diet does not
compromise weight loss or
lipoproteins or vascular function
(Well designed study)
- Randomized, controlled, parallel study,
free-living (n=61)
- Male (n=13) and female (n=48) adults
with a age 40.8 ±8.9 years; BMI 32 ±3.9
- Energy restricted diet for 6 weeks at the
rate of 30% kcal from fat
- 200 g avocado/day (30.6 g fat) substituted
for 30 g of mixed fat (e.g., margarine and
vegetable oil) compared to a control diet
without avocado
- There was no difference in body weight,
BMI, and% body fat when avocados were
substituted for mixed fats in an energy
restricted diet
- There was also no difference in serum lipids
(total cholesterol, LDL-C, HDL-C, and
triglycerides), fibrinogen, blood pressure, or
blood flow when avocados were substituted
for mixed fats in an energy-restricted diet
Pieterse et al.,
2005
compared with a low-fat complex-carbohydrate-rich diet for
effects on blood lipids (Lerman-Garber et al., 1994). After 4
weeks, the avocado rich diet resulted in significantly lowered
plasma triglycerides and both diets maintained similar blood
lipids and glycemic controls. Additionally, a preclinical study
found that avocados can modify the HDL-C structure by in-
creasing paraoxonase 1 activity (PON-1), which can enhance
lipophilic antioxidant capacity and help convert oxidized LDL-
C back to its nonoxidized form (Mendez and Hernandez, 2007).
Avocado Components Related to Cardiovascular Health
The following section is an assessment of avocado’s many
nutrients and phytochemicals (Table 1) with potential cardio-
vascular health benefits. Avocados have a similar composition
profile to that of tree nuts, which have a heart health claim, with
less than half the calories (USDA, 2011) (Table 2).
Fatty Acids
Avocados can fit into a heart healthy dietary pattern such as
the DASH diet plan (USDA and HHS, 2010a; Jakobsen et al.,
2009; de Souza et al., 2008; Appel et al., 2005). Avocados
contain a monounsaturated fatty acids (MUFA)-rich fruit oil
with 71% MUFA, 13% polyunsaturated fatty acids (PUFA),
and 16% saturated fatty acids (SFA). As the avocado fruit ripens,
the saturated fat decreases and the monounsaturated oleic acid
increases (Lu et al., 2009; Slater et al., 1975; Moreno et al.,
1980). The use of avocado dips and spreads as an alternative
to more traditional hard, SFA rich spreads or dips can assist in
lowering dietary SFA intake (Avocado Central, 2012).
Carbohydrates
Dietary Fiber
Avocado fruit carbohydrates are composed of about 80%
dietary fiber, consisting of 70% insoluble and 30% soluble fiber
(Marlett and Cheung, 1997). Avocados contain 2.0 g and 4.6 g
of dietary fiber per 30 g and one-half fruit, respectively (USDA,
2011). Thus, moderate avocado consumption can help to achieve
the adequate intake of 14 g dietary fiber per 1000 kcal as about
one-third this fiber level can be met by consuming one-half an
avocado.
Sugars
Compared to other fruits, avocados contain very little sugar
(USDA, 2011). One-half an avocado contains only about 0.2 g
sugar (e.g., sucrose, glucose, and fructose). The primary sugar
found in avocados is a unique seven-carbon sugar called D-
mannoheptulose and its reduced form, perseitol, contributes
about 2.0 g per one-half fruit but this is not accounted for as sugar
in compositional database as it does not behave nutritionally as
conventional sugar and is more of a unique phytochemical to
avocados (Meyer and Terry, 2008; Shaw et al., 1980). Prelim-
inary D-mannoheptulose research suggests that it may support
blood glucose control and weight management (Roth, 2009).
The glycemic index and load of an avocado is expected to be
about zero.
Minerals
Potassium
Clinical evidence suggests that adequate potassium intake
may promote blood pressure control in adults (USDA and HHS,
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HASS AVOCADO COMPOSITION AND POTENTIAL HEALTH EFFECTS 743
2010b). The mean intake of potassium by adults in the United
States was approximately 3200 mg per day in men and 2400 mg
per day in women, which is lower than the 4700 mg per day
recommended intake (USDA and HHS, 2010b; IOM, 2005).
Avocados contain about 152 mg and 345 mg of potassium per
30 g and one-half fruit, respectively. Also, avocados are natu-
rally very low in sodium with just 2 mg and 5.5 mg sodium per
30 g and one-half fruit, respectively (USDA, 2011). The health
claim for blood pressure identifies foods containing 350 mg
potassium and less than 140 mg of sodium per serving as po-
tentially appropriate for this claim (FDA, 2000).
Magnesium
Magnesium acts as a cofactor for many cellular enzymes re-
quired in energy metabolism, and it may help support normal
vascular tone and insulin sensitivity (IOM, 1997). Preliminary
preclinical and clinical researches suggest that low magnesium
may play a role in cardiac ischemia (IOM, 1997). In the Health
Professionals Follow-up Study, the results suggested that the
intake of magnesium had a modest inverse association with
risk of coronary heart disease in men (Al-Delaimy et al., 2004).
Magnesium was shown to inhibit fat absorption to improve post-
prandial hyperlipidemia in healthy subjects (Kishimoto et al.,
2009). Avocados contain about 9 and 20 mg magnesium per
30 g and one-half fruit, respectively (USDA, 2011).
Vitamins
Antioxidant Vitamins
Avocados are one of the few foods that contain significant lev-
els of both vitamins C and E. Vitamin C plays an important role
in recycling vitamin E to maintain circulatory antioxidant pro-
tection such as potentially slowing the rate of LDL-cholesterol
oxidation. Evidence suggests that vitamin C may contribute to
vascular health and arterial plaque stabilization (IOM, 2000).
According to a recent review article, vitamin C might have
greater CVD protective effects on specific populations such as
smokers, obese, and overweight people; people with elevated
cholesterol, hypertension, and type 2 diabetics; and people over
55 years of age (Honarbakhsh and Schachter, 2009). Avocado
fruit contains 2.6 mg and 6.0 mg vitamin C per 30 g and one-half
fruit, respectively (USDA, 2011). Avocados contain 0.59 mg
and 1.34 mg vitamin E (α-tocopherol) per 30 g and one-half
avocado, respectively (USDA, 2011). One randomized clinical
study suggested that a combination of vitamin C and E may
slow atherosclerotic progression in hypercholesterolemic per-
sons (Salonen et al., 2003).
Vitamin K1(phylloquinone)
Vitamin K1functions as a coenzyme during synthesis of the
biologically active form of a number of proteins involved in
blood coagulation and bone metabolism (IOM, 2001). Phyllo-
quinone (K1) from plant-based foods is considered to be the
primary source of vitamin K in the human diet. Vitamin K1in
its reduced form is a cofactor for the enzymes that facilitate ac-
tivity for coagulation (McCann and Ames, 2009). The amount
of vitamin K1found in avocados is 6.3 μg and 14.3 μg per
30 g and one-half fruit, respectively (USDA, 2011). Some peo-
ple on anticoagulant medications are concerned about vitamin
K intake; however, the avocado level of vitamin K1per ounce is
150 times lower than the 1000 μgofK
1expected to potentially
interfere with the anticoagulant effect of drugs such as warfarin
(Coumadin) (Crowther et al., 1998; Dismore et al., 2003).
B-vitamins
Deficiencies in B-vitamins such as folate and B-6 may in-
crease homocysteine levels, which could reduce vascular en-
dothelial health and increase CVD risk (IOM, 1998; Antoniades
et al., 2009). Avocados contain 27 μg folate and 0.09 mg vita-
min B-6 per 30 g and 61 μg folate, respectively, and 0.20 mg
vitamin B-6 per one-half fruit (USDA, 2011).
Phytochemicals
Carotenoids
The primary avocado carotenoids are a subclass known
as xanthophylls, oxygen-containing fat-soluble antioxidants
(Voutilainen et al., 2006) (USDA, 2011) (Table 1). Xantho-
phylls, such as lutein, are more polar than carotenes (the other
carotenoid subclasses including β-carotene), so they have a
much lower propensity for pro-oxidant activity (McNulty et al.,
2008). Avocados have the highest lipophilic total antioxidant
capacity among fruits and vegetables (Wu et al., 2004). In a rel-
atively healthy population, the DASH diet pattern clinical study
reported reduced oxidative stress (blood ORAC and urinary iso-
prostanes) compared to a typical American diet (Miller et al.,
2005), which appears primarily due to the DASH diet providing
significantly more serum carotenoids, especially the xantho-
phyll carotenoids lutein, β-cryptoxanthin, and zeaxanthin, as a
result of increased fruit and vegetable consumption. Xantho-
phylls appear to reduce circulating oxidized LDL-C, a prelim-
inary biomarker for the initiation and progression of vascular
damage (Hozawa et al., 2007). The Los Angeles Atherosclerosis
Study, a prospective study, findings suggest that higher levels of
plasma xanthophylls were inversely related to the progression of
carotid intima-media thickness, which may be protective against
early atherosclerosis (Dwyer et al., 2001, 2004). Although this
research is encouraging, more clinical studies are needed to
understand the cardiovascular health benefits associated with
avocado carotenoids.
The consumption of avocados can be an important dietary
source of xanthophyll carotenoids (Lu et al., 2005; 2009). Hass
avocado carotenoid levels tend to significantly increase as the
harvest season progresses from January to September (Lu et al.,
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744 M. L. DREHER AND A. J. DAVENPORT
2009). In Hass avocados, xanthophylls lutein and cryptoxanthin
predominate over the carotenes, contributing about 90% of the
total carotenoids (Lu et al., 2009). USDA reports lutein and
zeaxanthin at 81 μg and 185 μg per 30 g and one half fruit,
respectively, and cryptoxanthin at 44 μg and 100 μg per 30 g
and one-half fruit, respectively (USDA, 2011). However, a more
comprehensive analysis of avocados including xanthophylls has
found much higher levels ranging from 350–500 μg per 30 g
to 800–1100 μg per one-half fruit at time of harvest (Lu et al.,
2009). The color of avocado flesh varies from dark green just
under the skin to pale green in the middle section of the flesh
to yellow near the seed (Lu et al., 2009). The total carotenoid
concentrations were found to be greatest in the dark green flesh
close to peel (Lu et al., 2005).
The intestinal absorption of carotenoids depends on the pres-
ence of dietary fat to solubilize and release carotenoids for trans-
fer into the gastrointestinal fat micelle and then the circulatory
system (Reboul et al., 2007; Ashton et al., 2006). Avocado fruit
has a unique unsaturated oil and water matrix naturally de-
signed to enhance carotenoid absorption. For salads, a signifi-
cant source of carotenoids, reduced fat or fat free salad dressings
are common in the marketplace and these dressings have been
shown to significantly reduce carotenoid absorption compared
to full fat dressings (Brown et al., 2004). Similar clinical re-
search has demonstrated that adding avocado to salad without
dressing, or with reduced fat/fat free dressing and serving avoca-
dos with salsa increases carotenoid bioavailability by 2–5 times
(Unlu et al., 2005).
Phenolics
Preliminary evidence suggests beneficial effects of fruit phe-
nolics on reducing CVD risk by reducing oxidative and inflam-
matory stress, enhancing blood flow and arterial endothelial
health, and inhibiting platelet aggregation to help maintain vas-
cular health (Chong et al., 2010; Arts and Hollman, 2005; Ghosh
and Scheepens, 2009; Victor et al., 2009). Avocados contain a
moderate level of phenolic compounds contributing 60 mg and
140 mg gallic acid equivalents (GAE) per 30 g and one-half fruit,
respectively. The avocado also has a total antioxidant capacity
of 600 μmol Trolox Equilvalent (TE) per 30 g or 1350 μmol
TE per one-half fruit (Wu et al., 2004; 2007). This places avo-
cados in the mid-range of fruit phenolic levels. Avocados have
the highest fruit lipophilic antioxidant capacity, which may be
one factor in helping to reduce serum lipid peroxidation and
promoting vascular health (Wu et al., 2007).
Phytosterols
Avocados are the richest known fruit source of phytosterols
(Duester, 2001) with about 26 mg and 57 mg per 30 g and one
half fruit, respectively (USDA, 2011). Other fruits contain sub-
stantially less phytosterols at about 3 mg per serving (Duester,
2001). Although the avocado’s phytosterol content is lower than
that of fortified foods and dietary supplements, its unique emul-
sified fat matrix and natural phytosterol glycosides may help
promote stronger intestinal cholesterol blocking activity than
fortified foods and supplements (Lin et al., 2009). A recent eco-
nomic valuation in Canada of the potential health benefits from
foods with phytosterols suggests that they may play a role in
enhancing cardiovascular health and reducing associated health
costs (Gyles et al., 2010).
WEIGHT MANAGEMENT
The availability and consumption of healthy foods, includ-
ing vegetables and fruits, is associated with lower weight (Bes-
Rastrollo et al., 2008) and body mass index (BMI) (de Oliveira
et al., 2008). Over the last several decades, there has been the
general perception that consuming foods rich in fat can lead to
weight gain, and low-fat diets would more effectively promote
weight control and reduce chronic disease risk (Walker and
O’Dea, 2001). However, a key large, randomized, long-term
clinical trial found that a moderate fat diet can be an effective
part of a weight loss plan and the reduction of chronic disease
risk (Sacks et al., 2009). “Strong and consistent evidence in-
dicates that dietary patterns that are relatively low in energy
density improve weight loss and weight maintenance among
adults” (USDA and HHS, 2010c). Three randomized controlled
weight loss trials found that lowering food-based energy den-
sity by increasing fruit and/or vegetable intake is associated with
significant weight loss (de Oliveira et al., 2008; Saquib et al.,
2008; Ello-Martin et al., 2007). The energy density of an en-
tire dietary pattern is estimated by dividing the total amount of
calories by the total weight of food consumed; low, medium,
and high energy density diets contain 1.3 kcal, 1.7 kcal, and 2.1
kcal per g, respectively (Savage et al., 2008). Avocados have
both a medium energy density of 1.7 kcal/g and a viscose water,
dietary fiber and fruit oil matrix that appears to enhance satiety
(Wien et al., 2011). This is consistent with research by Bes-
Rastrollo et al. (2008), which suggests that avocados support
weight control similar to other fruits.
Several preliminary clinical studies suggest that avocados
can support weight control. The first trial studied the effect of
including one and a half avocados (200 g) in a weight loss diet
plan. In this study, sixty-one healthy free-living, overweight,
and obese subjects were randomly assigned into either a group
consuming 200 g/d of avocados (30.6 g fat) substituted for 30 g
of mixed fats, such as margarine and oil, or a control group
excluding avocados for 6 weeks (Pieterse et al., 2005). Both
groups lost similar levels of weight, body mass index (BMI),
and percentage of body fat (p<0.001) to confirm that avoca-
dos can fit into a weight loss diet plan. A randomized single
blinded, crossover postprandial study of 26 healthy overweight
adults suggested that one-half an avocado consumed at lunch
significantly reduced self-reported hunger and desire to eat, and
increased satiation as compared to the control meal (p<0.002)
(Wien et al., 2011). Additionally, several exploratory trials sug-
gest that MUFA rich diets help protect against abdominal fat
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HASS AVOCADO COMPOSITION AND POTENTIAL HEALTH EFFECTS 745
accumulation and diabetic health complications (Tentolouris
et al., 2008; Paniagua et al., 2007a; 2007b).
HEATHY AGING
DNA Damage Protection
Several clinical studies suggest that xanthophylls, similar to
those found in avocados, may have antioxidant and DNA pro-
tective effects with possible healthy aging protective effects.
One study was conducted involving 82 male airline pilots and
frequent air travelers who are exposed to high levels of cos-
mic ionizing radiation known to damage DNA, potentially ac-
celerating the aging process (Yong et al., 2009). There was a
significant and inverse association between intake of vitamin
C, beta-carotene, β-cryptoxanthin, and lutein-zeaxanthin from
fruits and vegetables and the frequency of chromosome translo-
cation, a biomarker of cumulative DNA damage (p<0.05). In
another trial, lipid peroxidation (8-epiprostaglandin F2a) was
correlated inversely with plasma xanthophyll levels (Haegele
et al., 2000). In other studies, inverse correlations were found
between lutein and oxidative DNA damage as measured by the
comet assay, and in contrast to beta-carotene (Hughes et al.,
2009; Thomson et al., 2007). NHANES analysis suggests that
xanthophylls intake decreases with aging (Johnson et al., 2010).
Osteoarthritis
Osteoarthritis (OA) is characterized by progressive deteriora-
tion of joint cartilage and function with associated impairment,
and this affects most people as they age or become overweight or
obese (Dinubile, 2010; Helmick et al., 2008). This joint deteri-
oration may be triggered by oxidative and inflammation stress,
which can cause an imbalance in biosynthesis and degrada-
tion of the joint extracellular matrix leading to loss of function
(Dinubile, 2010; Gabay et al., 2008; Jacques et al., 2006;
Goldring and Berenbaum, 2004; van der Kraan and van den
Berg, 2000; Lotz et al., 1995). A cross-sectional study reported
that fruits and vegetables rich in lutein and zeaxanthin (the pri-
mary carotenoids in avocados) are associated with decreased
risk of cartilage defects (early indicator of OA)(Wang et al.,
2007).
Avocado and soy unsaponifiables (ASU) is a mixture of fat
soluble extracts in a ratio of about 1(avocado):2(soy). The ma-
jor components of ASU are considered anti-inflammatory com-
pounds with both antioxidant and analgesic activities (Dinubile,
2010; Lipiello et al., 2008; Au et al., 2007; Henroitin et al.,
2006; Berenbaum, 2004; Ernst, 2003; Blotman et al., 1997). In
vitro studies found that pretreatment of chondrocytes with ASU
blocked the activation of COX-2 transcripts and secretion of
prostaglandin E2(PGE2) to baseline levels after activation with
lipopolysaccharide (LPS). Further study revealed that ASU can
also block tumor necrosis factor-α(TNF-α), IL-1β, and iNOS
expression to levels similar to those in nonactivated control
cultures. Additional laboratory studies suggest that ASU may
facilitate repair of OA cartilage through its effect on osteoblasts
(Dinubile, 2010).
Clinical support for ASU in the management of hip and knee
OA comes from four randomized controlled trials (Lequesne
et al., 2002; Appelboom et al., 2001; Maheu et al., 1998;
Blotman et al., 1997) and one meta-analysis (Christensen et al.,
2008). All studies used 300 mg per day. The clinical trials
were generally positive with three providing OA support and
one study showing no joint cartilage improvement compared to
placebo.
Eye Health
Lutein and zeaxanthin are selectively taken up into the mac-
ula of the eye (the portion of the eye where light is focused on
the lens) (Caepentier et al., 2009). Relative intakes of lutein and
zeaxanthin decrease with age and the levels are lower in females
than males (Johnson et al., 2010). Mexican Americans have the
highest intake of lutein and zeaxanthin than any other ethnicity
and they are among the highest consumers of avocados in the
United States. Observational studies show that low dietary intake
and plasma concentration of lutein may increase age-related eye
dysfunction ((Ma et al., 2009; Parekh et al., 2009; Chong et al.,
2009; Moeller et al., 2008; Cho et al., 2008; Wang et al., 2007).
Research from the Women’s Health Initiative Observation Study
found that MUFA rich diets were protective of age-related eye
dysfunction (Chong et al., 2009; Moeller et al., 2008). Avocados
may contribute to eye health since they contain a combination
of MUFA and lutein/zeaxanthin and help improve carotenoid
absorption from other fruits and vegetables (Unlu et al., 2005).
Avocados contain 185 μg of lutein/zeaxanthin per one-half fruit,
which is expected to be more highly bioavailable than most other
fruit and vegetable sources.
Skin Health
Skin often shows the first visible indication of aging. Topi-
cal application or consumption of some fruits and vegetables or
their extracts such as avocado has been recommended for skin
health (Roberts et al., 2009; Morganti et al., 2002; 2004). The
facial skin is frequently subjected to ongoing oxidative and in-
flammatory damage by exposure to ultraviolet (UV) and visible
radiation and carotenoids may be able to combat this damage. A
clinical study found that the concentration of carotenoids in the
skin is directly related to the level of fruit and vegetable intake
(Rerksuppaphol and Rerksuppaphol, 2006). Avocado’s highly
bioavailable lutein and zeaxanthin may help to protect the skin
from damage from both UV and visible radiation (Roberts et al.,
2009). Several small studies suggest that topical or oral lutein
can provide photo-protective activity (Puizina, 2008; Palombo
et al., 2007; Morganti et al., 2002).
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746 M. L. DREHER AND A. J. DAVENPORT
A cross-sectional study examined the relationship between
skin anti-aging and diet choices in 716 Japanese women (Nagata
et al., 2010). After controlling for covariates including age,
smoking status, BMI, and lifetime sun exposure, the results
showed that higher intakes of total dietary fat were significantly
associated with more skin elasticity. A higher intake of green and
yellow vegetables was significantly associated with fewer wrin-
kles (Nagata et al., 2010). Several preclinical studies suggest
that avocado components may protect skin health by enhancing
wound healing activity and reducing UV damage (Nayak et al.,
2008; Rosenblat et al., 2011).
Cancer
Avocados contain a number of bioactive phytochemicals in-
cluding carotenoids, terpenoids, D-mannoheptulose, persenone
A and B, phenols, and glutathione that have been reported to
have anti-carcinogenic properties (Ding et al., 2009; Jones et al.,
1992; Ames, 1983). The concentrations of some of these phyto-
chemicals in the avocado may be potentially efficacious (Jones
et al., 1992). Currently, direct avocado anti-cancer activity is
very preliminary with all data based on in vitro studies on hu-
man cancer cell lines.
Cancer of the larynx, pharynx, and oral cavity are the primary
area of avocado cancer investigation. Glutathione, a tripeptide
composed of three amino acids (glutamic acid, cysteine, and
glycine) functions as an antioxidant (Flagg et al., 1994). The
National Cancer Institute found that avocado’s glutathione lev-
els of 8.4 mg per 30 g or 19 mg per one-half fruit is several
fold higher than that of other fruits (Flagg et al., 1994). Even
though the body digests glutathione down to individual amino
acids when foods are consumed, a large population-based case
controlled study showed a significant correlation between in-
creased glutathione intakes and decreased risk of oral and pha-
ryngeal cancer (Castillo-Juarez et al., 2009). One clinical study
found that plasma lutein and total xanthophylls but not individ-
ual carotenes or total carotenes reduced biomarkers of oxidative
stress (urinary concentrations of both total F2-isoprostanes and
8-epi-prostaglandin) in patients with early-stage (in situ, stage
I, or stage II) cancer of larynx, pharynx, or oral cavity (Hughes
et al., 2009). Xanthophyll rich avocado extracts have been shown
in preclinical studies to have anti-Helicobacter pylori activity for
a potential effect on gastritis ulcers, which may be associated
with gastric cancer risk (Castillo-Juarez et al., 2009).
Dietary carotenoids show potential breast cancer protec-
tive biological activities, including antioxidant activity, induc-
tion of apoptosis, and inhibition of mammary cell proliferation
(Thomson et al., 2007). Studies examining the role of fruits
and vegetables and carotenoid consumption in relation to breast
cancer recurrence are limited and report mixed results (Thom-
son et al., 2007). In preclinical studies, total carotenoids and
lutein appear to reduce oxidative stress, a potential trigger for
breast cancer (Ding et al., 2007). In women previously treated
for breast cancer, a significant inverse association was found
between total plasma carotenoid concentrations and oxidative
stress (Thomson et al., 2007), but more clinical research is
needed to confirm this finding.
Mammographic density is one of the strongest predictors
of breast cancer risk (Tamimi et al., 2009). The association
between carotenoids and breast cancer risk as a function of
mammographic density was conducted in a nested, case-control
study consisting of 604 breast cancer cases and 626 controls with
prospectively measured circulating carotenoid levels and mam-
mographic density in the Nurses’ Health Study (Tamimi et al.,
2009). Overall, circulating total carotenoids were inversely as-
sociated with breast cancer risk (p=0.01). Among women in
the highest tertile of mammographic density, elevated levels α-
carotene, β-cryptoxanthin, lycopene, and lutein/zeaxanthin in
the blood were associated with a 40–50% reduction in breast
cancer risk (p<0.05). In contrast, there was no inverse as-
sociation between carotenoids and breast cancer risk among
women with low-mammographic density. These results suggest
that plasma levels of carotenoids may play a role in reducing
breast cancer risk, particularly among women with high mam-
mographic density. There are no direct avocado breast cancer
clinical studies.
Exploratory studies in prostate cancer cell lines suggest an-
tiproliferative and antitumor effects of avocado lipid extracts (Lu
et al., 2005). Lutein is one of the active components identified.
There are currently no human studies to confirm this potential
lutein and prostate cancer relationship.
CONCLUSIONS
In the context of a healthy diet, consumption of avocados can
fit into a full range of healthy eating plans (e.g., DASH diet plan).
According to NHANES data, the average avocado consumption
is one-half fruit, which provides for a nutrient and phytochemi-
cal dense food consisting of significant levels of the following:
dietary fiber, potassium, magnesium, vitamin A, vitamin C, vita-
min E, vitamin K1, folate, vitamin B-6, niacin, pantothenic acid,
riboflavin, choline, lutein/zeaxanthin, phytosterols, and MUFA
rich oil at 1.7 kcal/g. This caloric density is medium-low because
an avocado is about 80% by weight is water (72%) and dietary
fiber (6.8%). Unlike the typical fruit, avocados contain a very
low sugar content with only about 0.2 g sugar per one-half fruit.
There are eight preliminary avocado cardiovascular health clin-
ical studies that have consistently demonstrated positive heart
healthy effects on blood lipids profiles. This is primarily be-
cause of avocado’s low SFA and high-unsaturated fatty acids
(MUFA and PUFA) content, but its natural phytosterols and di-
etary fiber may play potential secondary cholesterol lowering
roles. Avocados also have a diverse range of other nutrients
and phytochemicals that may have beyond cholesterol vascular
health benefits. In particular, avocado’s potassium and lutein
may help promote normal blood pressure and help to control
oxidative/inflammatory stress, respectfully. The consumption
of avocados with salads or salsa increases the bioavailability of
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HASS AVOCADO COMPOSITION AND POTENTIAL HEALTH EFFECTS 747
carotenoids multi-fold, which may add to the potential health
benefits. More comprehensive avocado clinical research is un-
derway to significantly expand the scientific understanding of
avocados in cardiovascular health, weight management, blood
glucose control and healthy living.
ACKNOWLEDGMENT
This review was supported by the HASS Avocado Board.
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