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Rocz Panstw Zakl Hig 2015;66(2):137-142
*Corresponding author: Joanna Wyka, Institute of Dietetics, University of Applied Sciences in Nysa, Ujejskiego street 12,
48-300 Nysa, Poland, phone +48 77 409 16 52, e-mail: joanna.wyka@pwsz.nysa.pl
© Copyright by the National Institute of Public Health - National Institute of Hygiene
ASSESSMENT OF FOOD INTAKES FOR WOMEN ADOPTING
THE HIGH PROTEIN DUKAN DIET
Joanna Wyka*, Ewa Malczyk, Marta Misiarz, Marzena Zołoteńka-Synowiec,
Beata Całyniuk, Sandra Baczyńska
Institute of Dietetics, University of Applied Sciences in Nysa, Ujejskiego street 12, 48-300 Nysa, Poland
ABSTRACT
Background. Overweight and obesity are metabolic disorders affecting both adults and children. Effective treatment of
these conditions is focused on decreasing the body mass, through individually tailored and well balanced diets, along with
increasing physical activity. Obese persons often, however, choose high protein diets for losing weight. Recently in Poland,
the high-protein Dukan-diet has become very popular.
Objectives. To assess dietary consumption in women adopting the Dukan-diet, including intakes of protein, fat, carbohy-
drate as well as vitamins and minerals.
Materials and Methods. Subjects were 51 women aged 19-64 years on the Dukan-diet, who were surveyed by individu-
ally conducted interview. Women were asked to provide typical menus from each phase of their diets. Quantitative dietary
intake assessment was achieved by an officially used ‘Photograph album of foodstuffs and dishes’ as custom-designed by
the National Food and Nutrition Institute (IZZ) in Warsaw.
Results. Protein intakes in all subjects were excessive, especially those of animal origin when compared to recommended
nutritional standards. In contrast, dietary carbohydrate intakes were low due to poor consumption of fruit and vegetables.
Mineral and vitamin intakes revealed high potassium, iron and vitamins A, D and B2, but low vitamin C and folates. Women’s
average weight reduction after 8-10 weeks of dieting was approximately 15 kilograms.
Conclusions. Many nutritional abnormalities were found in women on the high protein Dukan-diet. Adopting this diet in
the long-term may pose health threats through acquiring kidney and liver disease, osteoporosis and cardiovascular disease.
Key words: obesity, high protein diet, nutrients
STRESZCZENIE
Wprowadzenie. Otyłość i nadwaga są chorobami metabolicznymi, które dotyczą zarówno dorosłych, jak i dzieci. Właści-
wym postępowaniem w leczeniu tych chorób jest zmniejszenie masy ciała poprzez zastosowanie indywidualnej, dobrze
zbilansowanej diety oraz zwiększenie aktywności fizycznej. W celu redukcji masy ciała otyli pacjenci czasami decydują się
na zastosowanie diety wysokobiałkowej. W Polsce, w ostatnich latach, bardzo popularna jest wysokobiałkowa dieta Dukana.
Cel. Celem badań była ocena sposobu żywienia kobiet stosujących dietę wysokobiałkową Dukana. Oceniono zawartość
białek, tłuszczów, węglowodanów, a także witamin i składników mineralnych w diecie badanych kobiet.
Materiały i metody. Badanie zostało przeprowadzone za pomocą 24-godzinnego wywiadu przeprowadzonego indywidualnie
z każdą respondentką. W badaniu wzięło udział 51 kobiet w wieku 19-64 lat stosujących wysokobiałkową dietę Dukana.
Kobiety poproszono o podanie przykładowego jadłospisu z każdej fazy diety. Do oszacowania w wielkości (w gramach)
spożytej żywności wykorzystano „Album fotografii produktów i potraw” opracowany przez Instytut Żywności i Żywienia
w Warszawie.
Wyniki. Kobiety biorące udział w badaniu spożywały nadmierną ilość białka, szczególnie pochodzenia zwierzęcego,
w stosunku do zalecanych norm żywieniowych. Zawartość węglowodanów w racjach pokarmowych była niska i wynikała
z małej podaży warzyw i owoców. Wśród ocenianych składników mineralnych stwierdzono najniższe spożycie potasu
i żelaza, a najwyższe fosforu i sodu. Wykazano także, że ze stosowaną dietą niska była podaż witaminy C i folianów, na-
tomiast wysoka witamin A, D i B2. Wśród badanych kobiet, średnia redukcja masy ciała po 8-10 tygodniach stosowania
diety wynosiła około 15 kilogramów.
Wnioski. U kobiet stosujących wysokobiałkową dietę Dukana stwierdzono wiele nieprawidłowości żywieniowych. Długo-
trwałe stosowanie tej diety może zwiększyć ryzyko zdrowotne związane z wystąpieniem chorób nerek i wątroby, osteoporozy
oraz chorób sercowo-naczyniowych.
Słowa kluczowe: otyłość, dieta wysokobiałkowa, składniki odżywcze
J. Wyka, E. Malczyk, M. Misiarz, et al.
138 No 2
INTRODUCTION
Overweight and obesity are metabolic diseases
which are an ever rising problem in Poland as well as
the majority of economically developed countries of the
world. The WOBASZ study on overweight and obesity
undertaken in Poland, has shown these symptoms in
61.6% men and 50.3% women [1]. Above all, these were
found to arise from excess calorific dietary intake rela-
tive to its utilization [2]. Effective treatment of obesity
requires long-term therapy and a cooperation between
the patient with a multi-disciplinary team of dietician,
doctor, psychologist, physiotherapist and personal tra-
iner. The therapy is based on a multi-tier education of
the obese person, together with an individualised and
well balanced diet having a negative energy balance [21,
34]. Patience and being consistent are traits needed for
keeping to such diets. Obese patients however, usually
wish for quick results in losing weight and they have
often also tried slimming on several previous occasions
– without any lasting success.
Diets of varying nutrient content have become
popular in recent times, of which the most well known
are the single component types, with a preponderance
of protein [4, 6, 8]. The popularity of high protein diets
(i.e. >25% of protein derived calories) are because of
their rapid effects and no limits placed on how much
high protein foodstuffs are to be consumed [5]. Such
diets, where high protein is coupled to low carbohy-
drate, lead to rapid weight loss where, amongst other
things, this is caused by having reduced ghrelin levels;
a hormone produced by gastric parietal cells responsible
for reducing hunger pangs. Ghrelin concentrations de-
crease mainly due to dietary carbohydrate deficiencies,
followed by protein then fats. A carbohydrate-poor diet
leads to dehydration, where together with the utiliza-
tion of glycogen stores from muscle and liver, water is
removed from the body at a rate of 2-3 g water per 1 g
glycogen [3, 10, 22, 27].
Within the Polish scientific literature, not much data
has been gathered on the health impact of the long term
adoption of either high protein or high fat diets intended
for losing body mass [2, 20]. Results from the rest of
the world are from short-term studies that indicate a
clear body weight loss arising from low calorie diets,
vitamin and mineral intake deficiencies as well as in
renal function disorders due to increased glomerular
filtration of toxic products from nitrogen metabolism
[16, 32]. The long-term adoption of high protein diets
may lead to hyper-filtration, glomerular overload and
proteinuria. Filtered protein damages renal tubules
and upon entering the interstitial tissue, inflammation
results. Likewise, a diet containing processed meat
products, rich in protein, delivers excessive phosphates
leading to the development of secondary hyperthyro-
idism. Furthermore, a high protein diet causes increased
metabolic acidosis, a characteristic of advanced renal
failure [13, 15, 17, 28].
The study aim was to perform a dietary assessment
of those women on a high protein Dukan-diet, based on
surveying their menus from each of the diet’s 4 phases.
MATERIALS AND METHODS
The study surveyed 51 women subjects aged 19-64
years, that were on the Dukan-diet with no limits placed
for food consumption. The ‘Snowball Sampling’ method
was used for their recruitment i.e. a non-random sam-
ple selection dependent on existing subjects recruiting
others of their acquaintance [26, 29]. An assessment was
performed by individual interview for each subject on
the nutrition over the last 24 hours.
Table 1. Energy and nutrients in diet of women adopting the high protein Dukan diet according to the diet’s phase
Calories and
nutrient content
Phase I Phase II Phase III Phase IV
x ±SD (% of standards)
Calories [kcal] 888.0±558.0 (44.4%) 1020.0±303.7 (51%) 1014.0 ±407.0 (50.7%) 1008.0 ±482.0 (50.4%)
Protein [g] 109.0 ±18.2 (167.6%) 116.0 ±15.6 (178.4%) 87.0 ±14.8 (133.8%) 114.0 ±13.6 (175.3%)
Fat [g] 34.7 ±27.2 (51.0%) 33.3 ±16.3 (50,0%) 60.9 ±21.0 (92.2%) 48.7 ±19.6 (72.7%)
Carbohydrate [g] 39.7 ±17.8 (13.6%) 70.3 ±25.8 (24.5%) 30.8 ±15.6 (10.5%) 30.7 ±17.8 (10.7%)
Minerals
Calcium [mg] 675.0 ±256.0 (67.5%) 1003.0 ±311.0 (100.0%) 860.0 ±311.0 (86.0%) 954.0 ±372.0 (95.0%)
Iron [mg] 7.8 ±2.4 (43.3%) 11.7 ±3.8 (65.0%) 9.3 ±3.1 (51.6%) 5.3 ±1.4 (29.4%)
Sodium [mg] 1751.0 ±572.0 (116.0%) 1862.0 ±422.0 (124.1%) 1392.0 ±379.0 (92.8%) 1698.0 ±497.0 (113.2%)
Potassium [mg] 2129.0 ±645.0 (45.2%) 3464.0 ±582.0 (73.0%) 2911.0 ±602.0 (61,9%) 2335.0 ±645.0 (49.6%)
Phosphorus [mg] 1670.0 ±207.0 (238.5%) 1312.0 ±197.0 (187.4%) 1526.0 ±251.0 (218.0%) 1706.0 ±232.0 (243.0%)
Vitamins
A [µg] 1386.0 ±158.0 (198.0%) 1383.0 ±563.0 (197.0%) 1523.0 ±488.0 (217.0%) 1331.0 ±165.0 (190.0%)
D [µg] 7.6 ±3.5 (152.0%) 5.9±2.5 (118.0%) 5.5±2.0 (110.0%) 6.3±3.7 (126.0%)
B2 [mg] 2.0±0.5 (181.0%) 2.6±0.7 (236.0%) 1.9±0.6 (172.0%) 2.1±0.7 (190.0%)
C [mg] 2.7±1.7 (3.6%) 4.5±2.6 (6.0%) 2.5±1.9 (3.3%) 3.9±2.3 (5.2%)
Folate [µg] 120.0±53.0 (30.0%) 105.0±43.0 (26.2%) 155.0±62.0 (38.7%) 99.0±39.0 (24.7%)
Food intakes for women adopting the high protein Dukan diet 139No 2
Women subjects were asked to provide a typical
daily menu from the I, II, III and IV phases of their diet.
In phase I they consumed high protein foodstuffs, whilst
in the ensuing phases, other products could also be
introduced; in phase II some vegetables were allowed,
phase III some fruit and starch products whilst phase IV
only permitted high protein foodstuffs with a so called
‘pure protein day’ once per week. Quantitative dietary
intakes were determined by using the aforementioned
‘Photograph album of foodstuffs and dishes’ as custom-
-designed by the IZZ in Warsaw [30].
Menus were evaluated by the ‘Dieta 5’ computer
programme using a data base compiled by Kunachowicz
et al., also from the IZZ [14]. Additional information
was gathered on body mass and height before, during
and after dieting. The diet’s calorific value and nutrient
content were compared to recommended Polish nutritio-
nal standards [11] for each subject. From these, calorific
values were taken as those appropriate to the body mass
of each subject when there are low levels of physical
activity and assuming that dietary calories are derived
from 13% protein, 30% fat and 57% carbohydrate.
Dietary vitamin and mineral values were also compared
to either the Recommended Daily Allowance (RDA) or
the Adequate Intake (AI) for adult women.
Table 1 presents the mean dietary calorific and
macronutrient content (i.e. protein, fat and carbohy-
drate) along with minerals (calcium, iron, potassium
and phosphorus) and vitamins (A, D, B2, C and folates)
during each phase of the Dukan diet and the proportion
that this covers the recommended standards. Mean
dietary calories derived from each macronutrient (i.e.
protein, fat and carbohydrate), for the average diet of
each subject were compared to those recommended
by the IZZ. The subjects were broken down into 3 age
groups as follows; 40% aged 19-30 years, 47% aged 31
to 51 years and 13% aged 51-64%. Before dieting, the
BMI could be grouped into the following ranges; 47%
women (25-29.9), 47% (30-34.9) - 1st degree obesity,
and 6% (35-39.9) 2nd degree obesity.
RESULTS
For the phase I, high protein diet, the mean dietary
calorific values were 888.0 kcal (Table 1) which cove-
red the recommended standards for each subject by an
average of 44.4%, whilst mean protein intakes were 109
g making up a mean of 167.7% to the recommended
standards. Mean dietary fat intakes of 34.7 g covered
these standards by 51% and those for carbohydrates
were respectively 39.7 g and only 13.6%. Calcium
intake made up 67.5% of the recommendations. The
mean body mass loss during phase I was 2.4 kg. In the
following phases, similar nutrient contents were obse-
rved. Phase III showed intakes of 87 g protein and 60
g fat which are closer to standards set. Because of the
diet’s low calorific value (1014 kcal), the proportion
of calories in this phase that is derived from specific
nutrients differs most from the WHO/IZZ recommen-
dations (Figure 1). Calories derived from protein, fat
and carbohydrate during phase III are respectively 34%,
54% and 12% (Figure 1). In phase II, the highest body
mass reduction was found; on average by 10.6 kg. The
dietary intakes in phase IV demonstrated the greatest
iron and potassium deficiencies of respectively 29.4%
and 49.6% to the standards as well as having the highest
excess of phosphorus that covered 243.0% of standards.
Dietary intakes of vitamin C and folates were very low
in all phases; being respectively 3-6% and 24-38% of the
standards. During dieting after 8-10 weeks, the average
body mass loss was by around 15.0 kg.
Figure 1. Dietary calories derived from protein, fat and carbohydrate for women adopting a
high protein diet according to the diet’s phase
Dietary phases
% energy from macronutriens
Figure 1. Dietary calories derived from protein, fat and carbohydrate for women adopting a high protein diet according to
the diet’s phase
J. Wyka, E. Malczyk, M. Misiarz, et al.
140 No 2
DISCUSSION
Despite introducing preventative and therapeutic
programmes of education that deal with obesity each
year to the general public worldwide, attempts to global-
ly reduce the adverse increases in body mass have pro-
ved ineffective. Additionally, obesity is recognised to be
a risk factor in many other metabolic diseases, together
with hypertension, diabetes and cardiovascular disease;
all falling into the category of the Metabolic Syndrome
(MS). Obesity requires long-term treatment, which at
present focuses on lifestyle and genotype, but equally
also extra-nutritional factors such as economic-social
status, education and mental health. The effectiveness
of a rational and safe reductive diet, as recommended
by WHO/IZZ, is conditional on consistently and thoro-
ughly keeping to its principles. Patients however expect
quick outcomes, which directly serves to motivate
them in seeking unconventional and fashionable diets.
Nonetheless, very few are aware of the adverse health
effects in adopting such dieting.
By reducing carbohydrate intakes, high-calorie
foodstuffs become excluded, like pizza, pasta or bread
thereby decreasing a diet’s calories by around 500 kcal.
Limiting dietary energy intake forms the basis of all
slimming diets, as does having a normally balanced
diet to achieve body mass loss. During deficiencies in
dietary carbohydrate intake, free fatty acids are meta-
bolised from which ketone bodies arise. Ketosis status
is an important factor for inhibiting appetite [6]. In
the first days of adopting the diet, various processes
occur leading to the body losing water, such as glyco-
gen mobilisation from muscle or the liver; a glycogen
loss of 400 g reduces water by 1 kg. Another cause of
dehydration is the excretion of ketone bodies in the
urine. Adopting a high protein diet carries the potential
risk for elevated serum homocysteine concentrations,
which is a sulphur containing amino acid produced by
methionine metabolism present in animal meat protein.
For homocysteine to become adequately metabolised,
then vitamin B group vitamins and folates are required
in sufficient amounts; as delivered through the diet.
Dietary deficiencies of these vitamins are observed in
women adopting high protein diets leading to blood
vessel damage and may result in arteriosclerosis [25].
Studies on healthy subjects eating high protein diets
have been unable to show any disorders in glomerular
filtration. Nevertheless, an increased excretion of cal-
cium, urates and phosphates was observed which may
lead to kidney stone formation [12, 24]. Disturbing the
acid-base balance, as a result of high dietary protein
intake, also increases the risk of osteoporosis [19, 33].
Excessive consumption of animal derived protein, being
a rich source of purines, increases serum concentrations
of uric acid, that leads to hypertension and renal function
disorders. The advantages of rapid weight loss of high
protein diets needs to be reconciled with the potential
health threats such as advancing renal and cardiovascu-
lar disease. Extensive recent studies have compared the
effectiveness for reducing body mass by adopting diets
supplying various macronutrients [7].
In summary, the authors stress that the greatest body
mass loss was seen after 6 months of adopting each diet
(arising from a decreased calorie intake) amounting to
around 6 kg. Following 2 years of following a 15% or
25% protein diet, the loss of body mass were respec-
tively 3 and 3.6 kg. An approximate 3.3 kg body mass
loss was observed in those adopting a 20% and 40%
fat diet, whilst subjects on 65% and 35% carbohydrate
diets lost respectively 2.9 kg and 3.4 kg. When discus-
sing the dietary role of protein, Te Morenga and Mann
[31] emphasised that body mass loss in those obese
subjects adopting high protein diets arises from reduced
calorific intakes. Taking up such eating habits may lead
to an increased cancer risk through excessive red meat
consumption as well as lowering blood pressure and
evening-out the blood lipid profile.
The presented study demonstrated a reduced risk of
contracting diabetes for those taking up a high protein
diet through improved glycaemic control and insulin
resistance. Following a 55-60% carbohydrate diet with
15% protein or a 40-45% carbohydrate diet with 25-30%
protein together with taking physical exercise, led to the
following to become lowered; insulin resistance index
by 0.2, BMI by 6.8% and body adipose tissue in studied
teenagers by 2.4%. When comparing the health benefits
of adopting high carbohydrate, protein and fat diets in 96
women subjects (BMI<27), McAuley et al. [18] found
that, after 8 weeks, all 3 diets caused body mass loss,
reduced waistline and decreased serum triglycerides.
Blood insulin was significantly reduced in women
following high protein and high fat diets compared to
those adopting a high carbohydrate diet.
CONCLUSIONS
1. Women taking up high protein diets demonstrated
deficient calorific intake which was responsible for
the lowering of body mass.
2. The women’s diet had low contents of carbohydrate,
calcium, iron, potassium, vitamin C and folates but
excessive amounts of protein, phosphorus, sodium
along with vitamins A and D.
3. Adopting a high protein diet in the long term may
be harmful to health.
Conflict of interest
The authors declare no conflict of interest.
Food intakes for women adopting the high protein Dukan diet 141No 2
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2009;5(3):87-98 (in Polish).
Received: 12.12.2014
Accepted: 08.04.2015