The Hacking of the American Mind: Pleasure, Happiness and Food Addiction

Table of Contents

1. The Book and Where It Came From
2. Pleasure Is Not Happiness
3. Dopamine: The Reward Signal
4. Serotonin: The Contentment Signal
5. Stress, Cortisol and Comfort Food
6. Temptation, Marketing and the Modern Environment
7. Fast Food and Addiction (2011)
8. The Battle Over Food Addiction (2025)
9. His Studies on Stress and Reward-Driven Eating
10. Wider Research on Food Reward and Addiction
11. Lasting Happiness in His Account
12. Key Research Papers
13. Connections

1. The Book and Where It Came From

The Hacking of the American Mind: The Science Behind the Corporate Takeover of Our Bodies and Brains was published by Avery, an imprint of Penguin Random House, on September 12, 2017. It came after Fat Chance (2013) and before Metabolical (2021). Where his sugar lectures centred on the liver and insulin, The Hacking of the American Mind turns to the brain: to the chemistry of wanting, of feeling content, and of stress.

The book did not appear out of nowhere. Lustig’s training is in neuroendocrinology — the study of how the brain, and especially the hypothalamus, controls the hormones of the body. Years before the book, he had written about how the brain’s reward and stress systems take part in childhood obesity. In a 2006 paper he argued that the “western environment” starves children’s brains of the signals that would normally tell them they have eaten enough, and in a 2008 review with Marisa Mietus-Snyder he described children with obesity as “adrift in the limbic triangle” — caught between the brain circuits for energy balance, for reward and for stress. In another 2006 paper, his reinterpretation of the First Law of Thermodynamics, he argued that eating more and moving less are themselves driven by biochemistry rather than being simple failures of willpower.

His own website files food addiction under this book: its food-addiction page points readers to The Hacking of the American Mind for the full argument.

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2. Pleasure Is Not Happiness

The book’s central claim is that modern life has blurred two different feelings — pleasure and happiness — and that the two run on different brain chemistry. On his page “Happiness Hacked” Lustig sets out the contrast in these words:

“Pleasure is short-lived, visceral, usually experienced by oneself, achievable with substances. Happiness, by contrast, is often the opposite—long-lived, ethereal (purposeful, transcendent), often experienced in meaningful social groups and cannot be achieved through substances. Pleasure is taking, while happiness is giving.”

Laid out side by side, his description gives these pairs:

• Duration — pleasure is short-lived; happiness is long-lived.
• Where it is felt — pleasure is visceral, felt in the body; happiness is “ethereal”, which he glosses as purposeful and transcendent.
• With whom — pleasure is usually experienced alone; happiness is often experienced in meaningful social groups.
• How it is reached — pleasure can be reached with substances; happiness, he says, cannot.
• Direction — pleasure is taking; happiness is giving.

In Lustig’s account, a society that keeps selling pleasure as if it were happiness ends up with more of the first and less of the second. The rest of the book is his attempt to explain the brain chemistry behind that trade.

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3. Dopamine: The Reward Signal

Lustig assigns pleasure, in the sense of wanting and reward, to dopamine. The book page on his site describes dopamine as “the ‘reward’ neurotransmitter that tells our brains we want more”. In its everyday role dopamine drives motivation: it pushes a person toward food, toward a goal, toward the next experience. In the extreme, the same page says, constant dopamine stimulation leads to addiction.

Addiction medicine calls it tolerance when the same reward produces less effect over time, so that more is needed; tolerance and withdrawal are the markers his 2011 review on fast food looked for (Section 7). In his 2010 paper on the parallels between fructose and alcohol he wrote that fructose stimulates the brain’s “hedonic pathway”, creating habituation and “possibly dependence” — the brain-reward strand of his sugar argument that the book widens to other pleasures.

The neuroscience behind this framing is described more fully on the site’s animation of the dopamine reward pathway.

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4. Serotonin: The Contentment Signal

Happiness, in Lustig’s scheme, belongs to serotonin. His book page calls serotonin “the ‘contentment’ neurotransmitter that tells our brains we don’t need any more”, and it links serotonin deficiency to depression. Where dopamine says “more”, serotonin, in his description, says “enough”.

The heart of the book is his claim about how the two systems interact. The same page states that “dopamine evolved to overwhelm serotonin” — that the drive to seek reward was built to win out over the feeling of being satisfied — and that constant desire “can chemically destroy our ability to feel happiness”. In his telling, the person who chases one dopamine reward after another is not only at risk of addiction at one end but of losing contentment at the other.

This is Lustig’s own synthesis, presented in a book for the general public. The site’s animation of serotonin and mood describes the serotonin system on its own terms.

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5. Stress, Cortisol and Comfort Food

The third chemical in the book is cortisol, the hormone of stress. Lustig’s site lists constant stress, alongside temptation, as one of the two forces he holds responsible for the loss of happiness he describes. His earlier 2008 review on the “limbic triangle” had already placed stress as one corner of the triangle that, in his view, keeps children with obesity eating: the stress system pulls on the reward system, and both pull on the circuits that regulate energy balance.

Two UCSF studies that he co-authored looked at stress and eating in people:

• Tomiyama and colleagues (2012), with Lustig among the authors, reported that the way leptin — the fat-tissue hormone that signals fullness — changed in response to acute stress predicted how much comfort food participants went on to eat.
• Aschbacher and colleagues (2014), again with Lustig as a co-author, reported that chronic stress increased vulnerability to diet-related abdominal fat, oxidative stress and metabolic risk.

In the book, cortisol is the third chemical of his account, beside dopamine and serotonin, and stress is the second of the two forces he blames for the loss of contentment. The site’s appetite, leptin and ghrelin animation shows the fullness signals involved.

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6. Temptation, Marketing and the Modern Environment

Lustig’s site attributes the trend to two forces acting together: a steady stream of temptation — he lists sugar, drugs, social media and pornography — and constant stress. To these he adds marketing. In the book he points to what he calls neuromarketing — marketing built on brain science.

The subtitle of the book, “the science behind the corporate takeover of our bodies and brains”, carries this charge. Lustig names particular companies in his own writing; this page does not repeat those names (a site rule), and reports his argument in general terms, as a charge against industry and marketing.

The same theme runs through his later work on processed food. In 2020 he argued that added sugar, and by proxy ultra-processed food, is “addictive, toxic, and ready for regulation” — the subject of the Metabolical and processed food page.

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7. Fast Food and Addiction (2011)

Six years before the book, Andrea Garber and Lustig published a review in Current Drug Abuse Reviews under the question “Is fast food addictive?”. It is a careful paper, and its conclusions are hedged:

• The authors wrote that sugar addiction, including tolerance and withdrawal, “has been demonstrated in rodents but not humans”.
• They concluded that “the concept of fast food addiction remains to be proven”.
• They nonetheless described fast food as “a potentially addictive substance” that is “most likely to create dependence in vulnerable populations”.

The 2011 paper is the starting point of the food-addiction thread in his work. It separates what had been shown in animals from what had not yet been shown in people — a distinction that the later debate continued to turn on.

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8. The Battle Over Food Addiction (2025)

In 2025 Lustig returned to the subject in a single-author paper in Frontiers in Psychiatry titled “The battle over ‘food addiction’”. In it he reviews eight common objections that have been raised against the idea that food can be addictive, and argues that mechanism is “paramount for scientific acceptance”. He then describes two mechanisms by which, in his view, certain foods act on the brain in the way addictive substances do.

His own website is open about where the idea stands: its food-addiction page describes food addiction as “still a controversial concept in the scientific community”. The 2025 paper is his answer to that controversy — an attempt to move the argument from behaviour (people who cannot stop eating certain foods) to biology (what those foods do in the brain).

The site’s addiction page covers addiction more broadly.

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9. His Studies on Stress and Reward-Driven Eating

Alongside the reviews, Lustig co-authored a series of UCSF studies that tested parts of the reward and stress picture in people. Each is described here by what it set out to examine:

• Opioid blockade and hedonic eating (2014). Daubenmier, Lustig and colleagues ran a preliminary study of cortisol and nausea responses when the brain’s opioid system was briefly blocked, as a possible biomarker of hedonic eating — eating for pleasure rather than hunger.
• A mindfulness-based weight-loss trial (2016). Daubenmier and colleagues, with Lustig among the authors, reported a randomized clinical trial of a mindfulness-based weight-loss programme in adults with obesity.
• Reward-driven eating in the same trial (2016). A secondary analysis by Mason, Epel and colleagues, Lustig among them, reported that reduced reward-driven eating accounted for the effect of the mindfulness-based diet and exercise programme on weight loss.
• A workplace sales ban (2020). Epel and colleagues, with Lustig as a co-author, reported on the association between a workplace ban on sales of sugar-sweetened beverages and employees’ consumption of those drinks and their health.

These studies are small and specific, and each answers its own narrow question. Together they show the direction of his interest after Fat Chance: from what sugar does in the liver to what reward and stress do in the brain.

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10. Wider Research on Food Reward and Addiction

Lustig’s book draws on a larger body of research by other scientists. Some of the main strands, described by what the papers themselves report:

• Sugar and addiction in rats. Avena, Rada and Hoebel (2008) reviewed behavioural and neurochemical effects of intermittent, excessive sugar intake in rats — the rodent evidence that the 2011 Garber and Lustig review referred to. These are animal findings.
• “Liking” and “wanting”. The neuroscientist Kent Berridge (2009), and later Morales and Berridge (2020), separated the pleasure of a reward (“liking”) from the drive to get it (“wanting”), and placed dopamine on the side of wanting. This is close to Lustig’s use of dopamine as the chemical of “want more” rather than of contentment.
• Overlap between obesity and addiction. Nora Volkow and colleagues (2008, 2013) reviewed overlapping brain circuits in addiction and obesity.
• Measuring addictive-like eating. Gearhardt, Corbin and Brownell (2016) developed version 2.0 of the Yale Food Addiction Scale, a questionnaire that maps eating behaviour onto the diagnostic criteria used for substance-use disorders.
• Which foods. Schulte, Avena and Gearhardt (2015) examined which foods may be addictive and reported that highly processed foods, especially those with added fat and refined carbohydrates and a high glycemic load, were the ones most associated with addictive-like eating. Lustig’s food-addiction page links to this work.

As his own site notes, food addiction remains debated among researchers; the papers above are part of that debate, not its conclusion.

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11. Lasting Happiness in His Account

The book does not end with diagnosis. Lustig offers a framework for what he calls lasting happiness, presented as “the 4Cs”; his book page states that “The 4Cs are prominently featured as a way to achieve lasting happiness.” It follows from his contrast in Section 2: happiness, as he describes it, is long-lived, often shared in meaningful social groups, and cannot be reached through substances.

Food is part of that picture. On his “Real Food” page he writes: “There is nothing that will improve your health, your well-being, your achievement, your sense of accomplishment, your sense of community, and the health and happiness of your family as much as cooking yourself and enjoying a meal with others.”

On sugar, his “Happiness Hacked” page cites the American Heart Association’s upper limits on added sugar — 6 teaspoons (25 g) a day for women and 9 teaspoons (38 g) for men — and then gives his own answer to how much added sugar a person needs for optimal health: “ZERO. ZIP. NADA. BUPKIS.” Lustig was himself a co-author of the 2009 American Heart Association scientific statement on dietary sugars that set those limits.

The site’s own pages on ultra-processed foods and on obesity set out the wider research on diet and weight.

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Key Research Papers

1. Garber AK, Lustig RH. Is fast food addictive? Curr Drug Abuse Rev. 2011;4(3):146-62. — PubMed PMID: 21999689
2. Lustig RH. The battle over “food addiction”. Front Psychiatry. 2025;16:1621742. — PubMed PMID: 40950761
3. Mietus-Snyder ML, Lustig RH. Childhood obesity: adrift in the “limbic triangle”. Annu Rev Med. 2008;59:147-62. — PubMed PMID: 17845135
4. Lustig RH. The ‘skinny’ on childhood obesity: how our western environment starves kids’ brains. Pediatr Ann. 2006;35(12):898-902, 905-7. — PubMed PMID: 17236437
5. Lustig RH. Childhood obesity: behavioral aberration or biochemical drive? Reinterpreting the First Law of Thermodynamics. Nat Clin Pract Endocrinol Metab. 2006;2(8):447-58. — PubMed PMID: 16932334
6. Lustig RH. Fructose: metabolic, hedonic, and societal parallels with ethanol. J Am Diet Assoc. 2010;110(9):1307-21. — PubMed PMID: 20800122
7. Lustig RH. Ultraprocessed Food: Addictive, Toxic, and Ready for Regulation. Nutrients. 2020;12(11):3401. — PubMed PMID: 33167515
8. Tomiyama AJ, Schamarek I, Lustig RH, Kirschbaum C, Puterman E, Havel PJ, et al. Leptin concentrations in response to acute stress predict subsequent intake of comfort foods. Physiol Behav. 2012;107(1):34-9. — PubMed PMID: 22579988
9. Aschbacher K, Kornfeld S, Picard M, Puterman E, Havel PJ, Stanhope K, et al. Chronic stress increases vulnerability to diet-related abdominal fat, oxidative stress, and metabolic risk. Psychoneuroendocrinology. 2014;46:14-22. — PubMed PMID: 24882154
10. Daubenmier J, Lustig RH, Hecht FM, Kristeller J, Woolley J, Adam T, et al. A new biomarker of hedonic eating? A preliminary investigation of cortisol and nausea responses to acute opioid blockade. Appetite. 2014;74:92-100. — PubMed PMID: 24291355
11. Daubenmier J, Moran PJ, Kristeller J, Acree M, Bacchetti P, Kemeny ME, et al. Effects of a mindfulness-based weight loss intervention in adults with obesity: A randomized clinical trial. Obesity (Silver Spring). 2016;24(4):794-804. — PubMed PMID: 26955895
12. Mason AE, Epel ES, Aschbacher K, Lustig RH, Acree M, Kristeller J, et al. Reduced reward-driven eating accounts for the impact of a mindfulness-based diet and exercise intervention on weight loss: Data from the SHINE randomized controlled trial. Appetite. 2016;100:86-93. — PubMed PMID: 26867697
13. Epel ES, Hartman A, Jacobs LM, Leung C, Cohn MA, Jensen L, et al. Association of a Workplace Sales Ban on Sugar-Sweetened Beverages With Employee Consumption of Sugar-Sweetened Beverages and Health. JAMA Intern Med. 2020;180(1):9-16. — PubMed PMID: 31657840
14. Johnson RK, Appel LJ, Brands M, Howard BV, Lefevre M, Lustig RH, et al. Dietary sugars intake and cardiovascular health: a scientific statement from the American Heart Association. Circulation. 2009;120(11):1011-20. — PubMed PMID: 19704096
15. Avena NM, Rada P, Hoebel BG. Evidence for sugar addiction: behavioral and neurochemical effects of intermittent, excessive sugar intake. Neurosci Biobehav Rev. 2008;32(1):20-39. — PubMed PMID: 17617461
16. Berridge KC. ‘Liking’ and ‘wanting’ food rewards: brain substrates and roles in eating disorders. Physiol Behav. 2009;97(5):537-50. — PubMed PMID: 19336238
17. Morales I, Berridge KC. ‘Liking’ and ‘wanting’ in eating and food reward: Brain mechanisms and clinical implications. Physiol Behav. 2020;227:113152. — PubMed PMID: 32846152
18. Volkow ND, Wang GJ, Fowler JS, Telang F. Overlapping neuronal circuits in addiction and obesity: evidence of systems pathology. Philos Trans R Soc Lond B Biol Sci. 2008;363(1507):3191-200. — PubMed PMID: 18640912
19. Volkow ND, Wang GJ, Tomasi D, Baler RD. Obesity and addiction: neurobiological overlaps. Obes Rev. 2013;14(1):2-18. — PubMed PMID: 23016694
20. Gearhardt AN, Corbin WR, Brownell KD. Development of the Yale Food Addiction Scale Version 2.0. Psychol Addict Behav. 2016;30(1):113-21. — PubMed PMID: 26866783
21. Schulte EM, Avena NM, Gearhardt AN. Which foods may be addictive? The roles of processing, fat content, and glycemic load. PLoS One. 2015;10(2):e0117959. — PubMed PMID: 25692302

PubMed Topic Searches

1. Lustig RH — addiction
2. Food addiction and dopamine
3. Lustig RH — stress and eating
4. Hedonic eating and reward

Further Reading

• Robert Lustig — “Hacking the American Mind” (book page on his own site)
• Robert Lustig — “Happiness Hacked” (his own site)
• Robert Lustig — “Food Addiction” (his own site)
• Robert Lustig — “Real Food” (his own site)
• Robert Lustig — Books (his own site)

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Connections

• Dr. Robert Lustig: Sugar, Fructose and Metabolic Health
• Robert Lustig: Life and Career
• Sugar: The Bitter Truth and the Fructose Argument
• Fructose Restriction Studies in Children
• Hypothalamic Obesity and Insulin
• Metabolical and the Case Against Processed Food
• Contemporary Practitioners
• Dopamine and Reward (animation)
• Serotonin and Mood (animation)
• Addiction
• Ultra-Processed Foods
• Appetite, Leptin and Ghrelin (animation)