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> they couldn’t eat less

If they are gaining weight, why can't they eat less?

metabolic slowing with increased calorie restriction means that eventually the body adapts to the point where youd be consuming too few calories to function and still barely losing any weight

Yes but they already lost weight. What I didn't understand is how the body decides to store fat, ie gain weight back, rather than function properly.

There's a lot of info about this online, but here's a quick TL;DR example: https://www.health.harvard.edu/diet-and-weight-loss/lessons-...

What most people don't understand is that weight loss and health is about a lot more than 'calories in/calories out', despite what we've been told for decades.

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