Scientists claim that overeating is not the primary cause of obesity

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". . . the process of getting fat causes overeating."

A perspective article challenges the 'energy balance model,' which says weight gain occurs because individuals consume more energy than they expend. According to the authors, 'conceptualizing obesity as a disorder of energy balance restates a principle of physics without considering the biological mechanisms underlying weight gain.' The authors argue for the 'carbohydrate insulin model,' which explains obesity as a metabolic disorder driven by what we eat, rather than how much.

Public health messaging exhorting people to eat less and exercise more has failed to stem rising rates of obesity and obesity-related diseases. The carbohydrate-insulin model makes a bold claim: overeating doesn't cause obesity; the process of getting fat causes overeating.

The current obesity epidemic is due, in part, to hormonal responses to changes in food quality: in particular, high-glycemic load foods, which fundamentally change metabolism. *Focusing on what we eat rather than how much we eat is a better strategy for weight management.

https://www.sciencedaily.com/releases/2021/09/210913135729.htm