Because eating less doesn’t require any effort.

Eating less takes a lot of effort for me because if I eat until I feel reasonably full, it’s actually too much food, and I gain weight. If I’m maintaining my weight, then I’m constantly hungry. If I’m losing weight, I feel like I’m starving.

I used to be pretty thin, even slightly underweight. Then I went on a medicine for a few months, and it completely ruined my appetite. I’m currently on a medicine for something unrelated that happens to curb my appetite, and it’s the only reason I’m not severely overweight.