I read that diets can make things worse by altering metabolism . Metabolism slows when on a diet, but when the diet is over metabolism remains slow, so it becomes very easy to regain the weight and then some.
It doesn't make sense that our bodies would be capable of doing this. Evolutionary, if our bodies could do the same tasks for a lower energy expenditure, we'd all do that. But you simply can't keep a body at 37.5°C for half the calories
After ‘The Biggest Loser,’ Their Bodies Fought to Regain Weight https://www.nytimes.com/2016/05/02/health/biggest-loser-weig...
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It has to do with resting metabolism, which determines how many calories a person burns when at rest. When the show began, the contestants, though hugely overweight, had normal metabolisms for their size, meaning they were burning a normal number of calories for people of their weight. When it ended, their metabolisms had slowed radically and their bodies were not burning enough calories to maintain their thinner sizes.
If you asked 190 pounds me how many calories a meal was I'd usually give a higher number than 165 pounds me. Variation in comfortable resting weights likely has more to do with different satiation points than the number of calories burnt by an individual.