All the pepole that are consistently eating 1500-1800 calories per day and are not bedridden are loosing weight and getting thin or less fat regardless of calorie counting and willpower.

There are people who eat more and still are thin but if you are not one of those people they should be none of your concern similarily to how people who inherited wealth - what they do - is meningless for person that was born poor, is poor and wants to get bit richer.

And fasting is conclusive anwer to weight loss if you can enforce it.

If you were in charge of getting inmate less fat that's exactly what you would order and he'd loose weight.

The problem with fasting in real world is that weight loss is not the only thing it affects end you can't ignore the side effects like you could do with an inmate.