140 Current Drug Abuse Reviews, 2011, 4, 140-145
1874-4737/11 $58.00+.00 © 2011 Bentham Science Publishers
The Addiction Potential of Hyperpalatable Foods
Ashley N. Gearhardt*,1, Caroline Davis2, Rachel Kuschner1 and Kelly D. Brownell1
1Yale University, New Haven, CT, USA
2York University, Toronto, Canada
Abstract: Scientific interest in “food addiction” continues to grow due both to neurobiological and behavioral similarities
between substance dependence and excessive food consumption. An important next step is to examine the addictive
potential of highly processed foods. In this paper, we explore addiction-related changes in the modern food environment
(e.g., increased potency, elevated speed of absorption), examine the historical and modern understanding of addictive
substances as applied to hyperpalatable foods, and outline shared factors th at increase th e public health costs of both
addictive drugs and certain foods.
Keywords: Food addiction, food environment, high fructose corn syrup, obesity, substance dependence, withdrawal.
Although the concept of food and addiction is receiving
widespread attention from the popular media, and is woven
into popular language and culture as seen with terms such as
“chocoholic” and “carbohydrate craving”, it has become
credible in the scientific community only recently [1-4].
Since 2006 there has been an exponential increase in the
number of academic publications relating to this topic (Fig.
1), due in part to a shift in persp ective to the view that
addictions should be reframed as unusually strong and
maladaptive desires to ingest a substance or engage in a
behavior despite negative consequences [5, 6].
Fig. (1). Number of publications containing the words “food
addiction” obtained from the Web of Science database, and plotted
for the years 2000-2010.
The term ‘food addiction’ might be seen as an oxymoron
since eating is quintessentially necessary for our health and
survival. We argue the opposite - that many of the highly-
processed foods in modern diets that damage health are more
similar to drugs of abuse than to the natural energy resources
people consumed historically (Table 1). Humans evolved to
prefer foods high in fat, sugar, and salt, but in the quantities
*Address correspondence to this author at the Yale University Department
of Psychology, 2 Hillhouse Ave., New Haven, Connecticut 06511, USA;
Tel: 415-265-9484; Fax: 203-432-7172; E-mail: Ashley.email@example.com
and availability these ingred ients now occur in processed and
refined foods, they appear to have an abuse potential similar
to addictive drugs like cocaine and alcohol [7-9].
A growing body of research has identified many
similarities between conventional addiction disorders and
excessive consumption of calorie-dense foods. Presently
many of the studies on the additive potential of certain foods
are based on examinations of rats exposed to sugar, fat, or
highly processed foods [3, 10]. The eating behavior of rats
may provide an especially useful analogue for human food
consumption, as both rats and humans are omnivores who
have developed the ability to ingest a diverse array of foods
. For both rats and humans the dopamine and opioid
neural circuitry implicated in drug addiction is also
associated with the motivation for food and food-related
reward [12, 13]. It has also been demonstrated that rats given
sugar, fat, or highly processed foods exhibit reward-related
neural changes seen in drug addiction, as well as the
behavioral signs of withdrawal, tolerance, and continued use
despite negative consequences [3, 10]. Scientific evidence of
the parallels between substance use and food consumption in
humans is also building. For example, drug and food
cravings foster similar patterns of neural activation in the
brain’s mesocorticolimbic pathways . Further, genetic
(i.e., DRD2 Taq1A allele) and personality factors (i.e.,
elevated reward responsivity) linked with addiction have
also been implicated in obesity and binge eating disorder
. Moreover, individuals who endorse symptoms of food
addiction as indicated by the Yale Food Addiction Scale are
more likely to exhibit patterns of craving-related neural
activation in response to food cues and disinhibition-related
neural activation during palatable food consumption .
Examining how hyperpalatable substances have addictive
properties is an important next step in evaluating the validity
of the food and addiction construct. This may be especially
true for understanding the utilityof an addiction perspective
in preventing and treating diet-related disease and obesity. In
this paper, we will explore addiction-related changes in the
modern food environment, examine the historical and
modern understanding of addictive substances, and outline
shared factors that increase the public health costs of both
addictive drugs and certain foods.
2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010
The Addiction Potential of Hyperpalatable Foods Current Drug Abuse Reviews, 2011, Vol. 4, No. 3 141
Table 1. Similarities Between Hyperpalatable Foods and
1. Activate dopamine and opioid neural circuitry
2. Trigger artificially elevated levels of reward
3. Absorbed rapidly into the blood stream
4. Alter neurobiological systems
5. Cause compensatory mechanisms that result in tolerance
6. Combined with additives to enhance rewarding properties
7. Elicit cue-triggered cravings
8. Consumed in spite of negative consequences
9. Consumed in spite of a desire to cut down
10. Impact disadvantaged groups to a disproportionate degree
11. Cause high public health costs
12. Exposure in utero can result in long-term alterations
Prior to examining the addictive potential of food, it is
useful to consider what constitutes a food. A wide-variety of
substances is consumed for sustenance, as well as pleasure,
and definitions of what is considered a food varies based on
cultural definitions. For example, insects are a staple of diets
in some regions (e.g., China) , but they are not
commonly eaten in the Western world. Further, the
increasing prevalence of chemicals, flavor enhancers and
lab-developed compounds in the food supply has led to the
question of whether ultraprocessed foods should no longer
be called food and should instead be relabeled as food-like
products . To add another layer of complexity, alcohol
(which is typically considered an addictive substance) is a
natural product of ripe fruits, may be a standard part of a
hunter-gather diet, and provides calories and some nutrients
in a similar manner as substances classified as food .
Although no one definition is able to succinctly capture the
complexity of this topic, in the current review we use the
term food to reference caloric items that are consumed as
part of the Western diet (i.e., might be purchased at a grocery
store) with special attention given to macronutrients that are
frequently manipulated during food processing, like fat and
sugar. Although alcohol may fall under this definition, in the
current paper we include ethanol-containing products in the
category of substances traditionally considered addictive.
The food environment has changed drastically, which has
resulted in foods with increasingly addictive-like properties.
In the pre-industrial era humans survived on a diet that was
minimally processed, high in protein, grains, and produce,
and relatively low in salt . Foods that had greater caloric
value through elevated sugar and fat content, such as berries
and animal protein, were relatively scarce. As an adaptation
to motivate consumption of calorically dense foods, we
evolved to find foods high in sugar and fat more hedonically
rewarding than foods low in these substrates . As
industrialization occurred and food-related technology
evolved, the environment changed from one with limited
access to calorie-dense foods to one of abundance with
artificially elevated levels of fat, sugar, salt, caffeine and
flavor enh ancers in the meals we eat .
Many highly processed foods have been altered in a
similar manner as addictive drugs. Both the elevated potency
of a substance, and its rapid absorption into the bloodstream,
increase a substance’s addictive potential . Many drugs
of abuse derive from plant materials that are refined into
highly concentrated substances (e.g., grapes into wine; the
coca leaf into cocaine). As a result of processing, these
substances became more potent and the active ingredients is
more quickly absorbed into the bloodstream. For example,
when the coca leaf is chewed or stewed as tea, it produces
only mild stimulation and is thought to have little addictive
potential . Further refinement provides a more potent
drug in the form of cocaine and crack, which is hedonically
very rewarding, quickly absorbed, and highly addictive .
Many highly palatable foods follow a similar process that
results in the quicker absorption of sugar and a higher level
of reward. For example, corn is a frequently consumed
starchy vegetable that has been part of the human diet for
centuries. With technological advances, corn was refined
into high fructose corn syrup (HFCS) – a highly
concentrated and very sweet simple carbohydrate, which is
not found in natural foods that comprise most traditional
In the past 40 years or so, HFCS has been added to a
large variety of processed products, such as soft drinks,
baked goods, and cereals. Indeed, our consumption of this
simple sugar has increased exponentially – from about 4 to
12% of our daily caloric intake in a few generations . In
this capacity, the special physiological properties of fructose
render it similar to other drugs of abuse. The most direct
parallels are seen between fructose and alcohol because the
two are biochemically and evolutionarily congruent. Ethanol
is simply the fermented byproduct of fructose  and can
have some health benefits when consumed in small doses.
For example, not only is ethanol an energy resource due to
its caloric content, but it may also serve as a stimulant to
further feeding. Given that ethanol is associated with the
valuable nutrients found in ripe fruit, Dudley  suggested
that a short-term advantage of ethanol might be to increase
the rate of food intake, which, in turn, would increase blood-
ethanol content and foster further consumption. Similarly,
HFCS provides the body with calories needed to maintain
functioning. Thus, consuming either HFCS or ethanol in
small doses may provide some benefits.
However, as both HFCS and ethanol are legal, relatively
cheap, widely available, and socially sanctioned in most
Western cultures, they are frequently consumed to excess.
When taken in large quantities, HFCS and alcohol may cause
biological changes that encourage further problematic use.
Excessive alcohol consumption causes mesolimbic
dopamine down-regulation, which fosters increased intake,
pronounced cravings, continued use despite negative
consequences and physical withdrawal symptoms during
periods of abstinence . High fructose consumption tends
to promote insulin resistance and chronic hyperinsulinemia,
and this occurs largely through its capacity to induce
increased release of triglycerides in th e liver . We have
142 Current Drug Abuse Reviews, 2011, Vol. 4, No. 3 Gearhardt et al.
also learned that the metabolic impact differs substantially
depending on the type of sugar that is consumed. For
instance, the monosaccharide fructose raises triglyceride
levels and lowers high-density lipoprotein, whereas glucose
does not have these effects . Fructose also blunts leptin
signaling thereby promoting sensations of hunger and
activation of the reward pathways creating a desire for
consumption independent of energy needs  – a
phenomenon that is directly comparable to what occurs when
alcohol is used excessively . This seems to occur
because HFCS bypasses the insulin-driven satiety system. In
other words, while glucose stimulates the release of insulin,
decreasing the desire to eat, fructose has this effect to a very
weak degree . Therefore, ingesting elevated amounts of
either ethanol or fructose can result in biological changes
that promote overconsumption.
Another consequence of processing for both food and
drugs of abuse is that the refined substance is combined with
additional products to enhance its rewarding properties. The
tobacco plant, for example, is harvested and processed into a
form that can be either inhaled as smoke, or ingested as a
result of chewing. Although the nicotine in the tobacco plant
is the main active ingredient, the tobacco industry has added
hundreds of additional ingredients to enhance the flavor and
aroma of the product, speed absorption into the lungs, and
increase cigarette shelf life . The resulting tobacco
product is significantly more rewarding and addictive than
A similar process occurs with hyperpalatable foods.
HFCS is not consumed on its own, but is combined with
other ingredients, such as sweeteners, fat, salt, flavor
enhancers, and caffeine. For ex ample, a frosted chocolate-
fudge Pop Tart combines HFCS with refined flour, sugar,
oil, salt, cocoa, flavor enhancers, and preservatives. In total,
the resulting product has approximately 37 ingredients.
Thus, similar to cigarettes, the substance that results from
processing is often significantly more rewarding than
minimally processed foods.
In addition to the increased levels of hedonic reward, the
processing of foods may also result in other addiction-related
changes, such as tolerance and cue-reactivity. For example,
individuals have a tendency to consume greater quantities of
foods they find palatable, as evident in the ever increasing
portion sizes of highly processed foods . The
consumption of food, especially in large quantities, increases
the level of glucose into the bloodstream, which disrupts the
homeostasis of the biological system . As a
compensatory mechanism, the pancreas begins to secrete
cephalic insulin in response to food-related cues or at the
beginning of food consumption to allow the body to tolerate
greater levels of food ingestion . Similarly, ingestion of
drugs of abuse also stresses the body and biological
responses occur to compensate for these disruptions, which
increases the body’s tolerance to the addictive substance
. Thus, the body adapts to the ingestion of either food or
drugs of abuse in a manner which results in higher levels of
tolerance. The development of elevated tolerance may then
drive even more problematic levels of consumption.
Addition ally, consump tion of sugar or addictive drugs can
result in elevated dopaminergic activation in response to
related cues, which is associated with an enhanced
motivation to seek out the substance (i.e., wanting) without a
corresponding increase in the hedonic pleasure received
during consumption of the substance (i.e. liking) [36, 37].
The sensitization of dopaminergic activity to cues may result
in cue-triggered cravings playing a large role in both
problematic eating and drug-taking behavior. In summary,
the elevated hedonic nature of highly processed foods may
initially encourage overconsumption, but other factors (e.g.,
increased tolerance, elevated wanting) may also drive
addictive-like eating behavior.
THE CONTROVERSIAL NATURE OF ADDICTION
Like the food environment, the conceptualization of an
addictive substance has changed throughout history. In the
19th century, substances that are now classified as addictive
were commonly consumed as a part of daily life. For
example, heroin was an ingredient in over-the-counter tonics
for both children and adults, cocaine was included in Coca-
Cola, and alcohol was consumed as an alternative to
contaminated water . In the late 1800s and early 1900s,
public concern about these substances grew, and some, like
heroin and opium were thought to be a threat to societal and
personal wellbeing . As the impact of these substances
on the body and brain became more evident in the latter part
of the 20th century, the list of problematic drugs increased.
Nevertheless, the classification of what constitutes an
addictive substance has often been controversial. Frequently,
the substance at the center of debate has been associated with
some central features of addiction (e.g., escalating use,
inability to stop despite problems), but lacks other typical
addiction markers. For example, cocaine is associated with
almost no physical withdrawal symptoms, which created
controversy about its addiction potential until the late 1980s
. The addictive nature of tobacco was also the focus of
debate, in part due to its lack of a strong intoxication
Hyperpalatable foods are also associated with some of
the factors that once caused cocaine and tobacco’s addictive
nature to be debated. Although there is evidence that sugar
consumption is associated with pronounced physical
withdrawal symptoms in animals , evidence of withdrawal
from hyperpalatable foods in humans is largely anecdotal
and based on reports of people experiencing headaches,
elevated cravings, irritability, and temperature dysregulation
while dieting . Like cocaine, the limited exploration of
food-related withdrawal in humans has increased skepticism
about the addictive nature of highly processed foods .
Moreover, in a similar manner as tobacco, consumption of
highly processed foods does not result in an obvious
intoxication syndrome. However, the level of intoxication
triggered by an addictive substance does not directly
correlate with the degree of negative consequences. Tobacco
is currently the number one cause of preventable death in the
United States despite the lack of an intoxication syndrome
. The greater public health cost associated with tobacco
is partly because of the ease of accessibility, increased social
acceptability, heavy marketing practices, and low cost .
Hyperpalatable foods are also ubiquitous, socially
acceptable, highly marketed, and inexpensive  and their
public health consequences are enormous. Furthermore,
despite the lack of an intoxication syndrome, ingredients in
The Addiction Potential of Hyperpalatable Foods Current Drug Abuse Reviews, 2011, Vol. 4, No. 3 143
highly processed foods appear to have reinforcing properties
on par - or possibly exceeding - drugs of abuse. For example,
Lenoir and colleagues  found that cocaine-addicted rats
will choose saccharin, a calorie-free sweetener, over cocaine
in a forced choice task, which led to the conclusion that the
rewarding properties of sweetness may surpass that of drug
Although hyperpalatable foods may differ in some ways
from the typical conceptualization of addictive drugs, they
share many features with traditionally addictive substances.
First, highly processed foods and drugs of abuse are both
capable of triggering cravings [14, 46]. Second, consumption
of highly processed foods and drugs of abuse can both be
associated with compulsive overuse in the face of severe
negative consequences . And finally, in some individuals
there is evidence of chronic relapse and an inability to cut
down consumption of both substances . Thus, while
highly processed foods may not be associated with a clear
intoxication syndrome, and evidence of withdrawal is just
now building, there are significant areas of overlap with
conventional addiction disorders.
In addition to nosological debates, the application of an
addictive label has also been mark ed by societal controversies.
For individuals, stigma is often associated with a substance
dependence diagnosis. The stereotype of persons with addiction
as weak-willed and untrustworthy can be a barrier for those
thinking of seeking treatment and may result in occupational
and social discrimination . In contrast, the conceptualization
of addiction as a disease has also led to more widespread
support for those seeking treatment for substance use disorders,
increased insurance coverage for addiction, and greater funding
for addiction-related research . Similarly, applying an
addiction perspective to food may increase weight stigma or
conversely may lead to greater support for the treatment of
eating-related problems. Addictive substances have also been
linked to questions of social justice. Certain addictive
substan ces (e.g., crack-cocaine)have been linked to
underprivileged groups (e.g., urban poor, African-Americans),
which have resulted in stricter legal consequences for the use of
these drugs relative to other substances . Further, at-risk
groups have often been disproportionally targeted for the
marketing of legal drugs. For example, primarily African-
American neighborhoods in metropolitan areas have a higher
density of tobacco billboards and magazines designed for
African-American readers are more likely to contain cigarette
advertisements . Currently, food-related problems, such as
obesity, are impacting minorities and economically
disadvantaged groups in disproportionately high numbers .
As with tobacco, advertisements for potentially addictive foods
are specifically designed to appeal to these demographics and
fast-food restaurants are more prevalent in poorer
neighborhoods [51, 52]. The historical relationship of addiction
with social issues may prove informative in considering the
burden of potentially addictive foods on disadvantaged groups.
SHARED FACTORS THAT INCREASE THE COST
OF ADDICTIVE SUBSTANCES
Although addictive substances appear to be somewhat
heterogeneous in nature (i.e., varying levels of withdrawal,
intoxication, etc.), the addiction rubric has been useful in
identifying substances that are likely to be consumed
excessively despite negative consequences and to result in
clinical levels of impairment/distress. Ultraprocessed foods
appear to share many of the characteristics of addictive
substances and excessive consumption of these foods is
already associated with some clinical disorders (e.g., binge
eating disorder). The consequences of potentially addictive
foods, like drugs of abuse, will also likely extend beyond
clinically significant disorders. Widespread use of addictive
substances often results in steep public health costs due in
part to sub-clinical problematic use. For example, alcohol
consumption is prevalent in America, but only 5-10% of
alcohol users develop alcohol dependence during their
lifetime . Despite the relatively low rates of dependence,
alcohol is the third leading cause of preventable death in the
United States, partially as a result of accidents and health
conditions caused by sub-clinical alcohol use . Highly
processed foods may have a similar impact on public health
by triggering problematic use in individuals that do not
exhibit clinically disordered eating. Moreover, ingredients in
highly processed foods are implicated in health problems
beyond elevated body mass index. For example, research
suggests that HFCS relative to sucroseis more likely to cause
adipose fat in the abdominal region, increase circulating
triglyceride levels, and result in metabolic syndrome [31,
54]. If hyperpalatable foods are capable of driving
widespread overeating and metabolic dysfunction to a degree
that impacts health, this may partially account for the high
public health cost of excessive food consumption .
Protective factors against the development of addictive
behaviors are also on the decline in the current food
environment. Addictive substances consumed in the context
of cultural and religious rituals appear to be less likely to be
abused (e.g., ). If it is only socially appropriate to
consume a substance in a specific context, social mores may
restrain substance use and only a limited number of cues
may be linked with the substance, which could result in
fewer triggers for use. In a similar vein, food consumption
has traditionally been linked with the experience of eating in
a social or cultural context. For examples, meals were
frequently eaten with family or friends while seated at a table
and snacking between meal times was not a common
practice. The current trends in food consumption find people
eating more frequently in isolation, in a variety of setting
(e.g., the car, at a work desk, in front of th e television), and
snacking regularly between meals . The uncoupling of
food consumption for social/cultural settings may also
increase the likelihood that highly processed food
consumption will result in an addictive behavior.
Additionally, the frequency and the duration of one’s
exposure to an addictive substance, as well as early age of
substance use , increases the likelihood of becoming
addicted . There is some evidence that the same dosing
effects may also apply to food high in sugar, fat and salt.
While drug experiences typically begin during adolescence
or early adulthood, direct exposure to processed and highly
palatable food normally begins within the first few years of
life. Indeed, recent research indicates that these influences
can occur in utero and can substantially modify the fetal
genome . For instance, maternal consumption of a high-
fat diet during pregnancy can induce long-term alterations in
dopamine and opioid gene expression and preference for
palatable foods in animal offspring . In addition, there is
144 Current Drug Abuse Reviews, 2011, Vol. 4, No. 3 Gearhardt et al.
evidence that children of obese mothers are at increased risk
for insulin resistance and subsequent obesity and metabolic
dysfunction . Therefore, the early age of exposure to
processed foods and the chronic nature of its consumption
may increase the consequences of potentially addictive
In summary, although highly processed foods differ from
the traditional conceptualization of addictive drugs in some
ways, such as the lack of intoxication, the degree of overlap
is significant and compelling. In addition to neurobiological
and behavioral similarities, hyperpalatable foods and
addictive substances both trigger artificially high levels of
reward, cause biological compensations that result in
tolerance, and become linked with associated cues. Factors
that increase the addictive potential of substances, such as a
lack of cultural context, frequent consumption and early age
of use, are also relevant to highly processed foods. Further,
the components that increase the public health consequences
of alcohol and nicotine are also present in the modern food
environment, such as the ease of accessibility, increased
social acceptability, heavy marketing and lower cost of high-
calorie foods. Due to the similarities between highly
processed foods and addictive drugs, successful policies in
reducing the impact of addictive drugs may also be useful in
combating food-related problems. For example, tobacco
consumption was significantly reduced in the United States
when effective individual treatments were comb ined with
tobacco-focused interventions, such as barring cigarette
machines, increasing taxes and limiting marketing. Similar
interventions have been proposed in response to the obesity
epidemic, such as reducing nutrient-poor foods in school
vending machines, implementing a soda tax and reducing
marketing of high-calorie foods to children [62,63]. Given
the similarities between highly processed foods and tobacco,
these approaches may also prove effective in reducing the
public health consequences of excess food consumption.
Future Research Questions:
• It is highly unlikely that all foods are equally capable of triggering
an addictive process. What foods have the greatest addictive
potential? What increases foods’ addictive nature (e.g., elevated
sugar, increased fat)?
• Does a reduction in the consumption of highly processed foods
trigger a withdrawal syndrome? Do symptoms of withdrawal from
hyperpalatable foods (e.g., anxiety, agitation, physical symptoms)
increase the risk of weight gain or being unable to adhere to a
• Can the implementation of protective factors against the
development of addictive behaviors (e.g., inclusion of consumption
in social/cultural settings, reduced exposure to advertisements) also
reduce problematic food consumption?
Key Learning Objective:
• The food environment has changed drastically in a relatively short
period of time. One cause for concern is that foods are now being
processed in ways that increase both their reward potency, as well as
the speed of absorption of fat/sugar into the system. These are two
factors that increase the addictive potential of other substances (e.g.,
coca leaves). This may have increased the likelihood that certain
foods may be capable of triggering an addictive process.
• Labeling a substance addictive has been historically controversial.
For example, the minimal physical withdrawal symptoms associated
with cocaine and the lack of an intoxication syndrome linked with
tobacco led to debates about their addictive nature. Hyperpalatable
foods are associated with similar factors, which will likely lead its
addictive nature to be a topic of controversy.
• Despite these differences, hyperpalatable foods and addictive drugs
share a number of characteristics. They are both associated with
loss-of-control, continued use despite negative consequences, high
rates of relapse, public health costs and in utero influences. If
evidence of the addictive potential of highly processed foods
continues to build, effective policies for reducing the impact of other
addictive substances (e.g., increased taxation, restricted advertising)
may prove essential in dealing with the obesity epidemic.
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Received: January 26, 2011 Revised: March 22, 2011 Accepted: April 19, 2011