Janet Polivy

Introduction

Janet Polivy is a Canadian psychologist, Professor Emerita of Psychology at the University of Toronto Mississauga, whose research with C. Peter Herman reshaped how psychology understands dieting. Working together from the mid-1970s, the two developed the restrained eating framework: the proposal that chronic dieting is not simply a failed attempt to eat less but a psychological state with characteristic and often counterproductive consequences. Their signature finding was counter-intuitive — people who chronically diet eat more after consuming a high-calorie "preload" than people who do not diet at all, a phenomenon they called counter-regulation.

Polivy's later work extended the same logic beyond food. With Herman she formulated the false hope syndrome, an account of why self-change attempts in many domains are launched with unrealistic expectations, fail, and are then relaunched with renewed confidence — a cycle she argued produces psychological damage of its own.

Early Life and Education

Polivy took a B.S. at Tufts University in 1971 and a PhD at Northwestern University in 1974. Northwestern in that period was a centre for experimental social psychology with a strong interest in the situational determinants of behaviour — an orientation that runs through everything she subsequently did. Her early work, much of it with Herman, examined depression, weight change, and the effects of anxiety and alcohol on eating.

Academic and Professional Career

Polivy was an assistant professor of psychology at Loyola University of Chicago from 1974 to 1977, then moved to the University of Toronto, where she was an assistant professor from 1977 to 1980, associate professor until 1985, and full professor of psychology and psychiatry until her retirement in 2013, after which she became professor emerita.

Alongside her research she held substantial professional roles: she was elected to the Council of the College of Psychologists of Ontario in 1994 and served two three-year terms, chairing its Registration Committee, Fitness to Practice Committee and Government Relations Committee and serving as its vice-president. She was treasurer of the Academy for Psychological Clinical Science, a member-at-large on the board of the Association for Psychological Science from 2010 to 2013 and on its nominating committee from 2013 to 2015, and she chaired the Social Sciences and Humanities Research Council's psychology grants committee twice.

She has been an elected Fellow of the Royal Society of Canada since 2006, received the University of Toronto Mississauga Research Excellence Award in 2009, and has been listed by ISI as one of the world's most highly cited researchers — a group comprising less than half of one percent of publishing scientists.

Major Contributions to Psychology

Restrained eating and the preload paradigm

The framework rests on a simple but consequential experiment. In the forced preload paradigm, restrained and unrestrained eaters are given a milkshake or similar high-calorie load and then offered food to taste. Unrestrained eaters show the ordinary regulatory pattern: having consumed calories, they eat less. Restrained eaters do the opposite — after a preload they eat more than restrained eaters given no preload. Polivy and Herman explained this through the boundary model, in which eating is bounded by a lower "diet" limit and an upper limit set by biology and by the perception that restraint has already been breached. Once a dieter exceeds the diet boundary — even by a single forbidden milkshake — the cognitive restraint that normally holds eating down is abandoned, and consumption overshoots well past what an unrestrained eater would have eaten.

The same logic generated the related finding that restrained eaters' intake rises under disinhibiting conditions: after alcohol, under anxiety, or following a threat to self-esteem. Restraint, on this account, is a fragile cognitive achievement rather than a stable disposition.

What dieting does to cognition

Polivy's work documented that caloric restriction carries cognitive and emotional costs: chronic dieters show heightened preoccupation with food, memory biases toward food-related material, narrowed attention, and elevated negative affect. This supplied an empirical basis for the claim that dieting is not behaviourally neutral — it changes how people think before it changes how much they weigh.

Body image, media and self-esteem

A second strand of Polivy's research examined how sociocultural input shapes body image and self-evaluation. With Lenny Vartanian and others she studied the effects of exposure to thin media imagery on women's body dissatisfaction, self-esteem and eating, and the conditions under which appearance comparisons do damage. This work connects to the restraint programme through a shared premise: that chronic concern with weight is maintained less by physiology than by a social environment that makes certain body standards seem both attainable and obligatory.

The false hope syndrome

With Herman, Polivy argued that self-change attempts characteristically begin with unrealistic expectations about how quickly change will come, how much it will produce, and how easy it will be. Because the initial expectations are unattainable, failure is near-certain; but failure is attributed to a flaw in execution rather than to the goal, so the person waits for a better moment and begins again with hope restored. Applied to weight loss, the syndrome describes how repeated cycles of diets and regain produce lowered self-esteem and a sense of personal ineffectiveness while leaving the underlying expectation structure untouched. Polivy and Herman extended the argument to smoking cessation, psychotherapy and other self-change domains.

Major Publications

  • Herman, C. P., & Polivy, J. (1975). "Anxiety, restraint, and eating behavior." Journal of Abnormal Psychology, 84, 666–672.
  • Herman, C. P., & Polivy, J. (1980). "Restrained eating." In A. J. Stunkard (ed.), Obesity. W. B. Saunders.
  • Herman, C. P., & Polivy, J. (1984). "A boundary model for the regulation of eating." In A. J. Stunkard & E. Stellar (eds.), Eating and Its Disorders. Raven Press.
  • Polivy, J., & Herman, C. P. (1985). "Dieting and binging: A causal analysis." American Psychologist, 40, 193–201.
  • Polivy, J., & Herman, C. P. (1987). "Diagnosis and treatment of normal eating." Journal of Consulting and Clinical Psychology, 55, 635–644.
  • Polivy, J., & Herman, C. P. (2002). "If at first you don't succeed: False hopes of self-change." American Psychologist, 57, 677–689 — the fullest statement of the false hope syndrome.
  • Herman, C. P., Polivy, J., Pliner, P., & Vartanian, L. R. (2019). Social Influences on Eating. Springer.

Impact and Legacy

Restrained eating became one of the most productive research programmes in eating behaviour and strongly influenced the cognitive-behavioural model of bulimia nervosa — the idea that dietary restraint precipitates bingeing was central to how that disorder was conceptualised and treated for a generation. The preload paradigm is still used, and "counter-regulation" is standard vocabulary.

The framework has also been under sustained challenge for roughly forty years, and the most serious objections concern what the central measure actually measures.

The Restraint Scale may not measure dieting. Michael Lowe and colleagues have argued for decades that the Restraint Scale's items load on two distinct factors — concern for dieting and weight fluctuation — and that the second reflects a history of weight instability and emotional over-involvement with food rather than current restraint. Their Three-Factor Model of Dieting distinguishes restraining intake to prevent over-consumption from dieting to lose weight, and treats those as having different consequences. If the scale partly measures disordered eating rather than dieting, then findings attributed to dieting may be findings about people who were already struggling.

Dieting may be a consequence rather than a cause. In a 2021 review in Physiology & Behavior, Chen, Singh and Lowe argued that restraint theory was developed in the mid-1970s, just before the population-level rises in obesity and binge eating, and that Herman and Polivy could not then have known that the increases in dysregulated eating around them had an environmental rather than a dietary origin. On this reading dieting is usually a symptom of an obesogenic environment and a pre-existing susceptibility to weight gain, not its cause — Lowe's analogy is methadone, where taking the drug is a response to addiction rather than its source. Restraint theory, on this account, unfairly made dieting the villain.

The causal claim about bingeing is contested. The proposition that dieting causes binge eating is the part of the framework with the largest clinical footprint and the least decisive evidence. Prospective studies give mixed results, and the direction of influence plausibly runs both ways: loss of control eating prompts dieting, and dieting can then intensify it.

Generalisability. Like much of this literature, the experimental base rests heavily on small samples of female undergraduates in laboratory taste-test situations, where demand characteristics are difficult to exclude and where the amounts consumed are trivial compared with real-world eating.

The false hope syndrome cuts both ways. Critics note that emphasising the futility of self-change risks discouraging attempts that do succeed: structured behavioural weight-loss programmes produce clinically significant loss in a substantial minority of participants, even though regain is the norm, and the syndrome's framing may understate this.

Polivy and Herman's position remains that the boundary model explains data the alternatives do not — why a single small violation produces disproportionate overeating, and why restraint is so easily disinhibited — and that the debate about measurement, while real, has not produced a framework that accounts for the preload findings more parsimoniously. The unresolved status of that exchange is itself the current state of the field.

Learn More

References

  • Polivy, J., & Herman, C. P. (1985). Dieting and binging: A causal analysis. American Psychologist, 40(2), 193-201.

Last updated: 2026-10-20

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