That's because not eating doesn't make you lose weight.
I've never understood why people think it's a good idea to stay thin or in shape by not eating at all.
Especially when, if you have a proper meal, a balanced meal, fats and sugars are quite low.
You end up missing out on the protiens and carbohydrates and all those fancy vitamins.
I know people who actively skip breakfasts or don't eat lunches or even dinner, but instead, snack on fatty sugary chocolate foods instead.
And then they wonder why they may have tummy flab, when they end up eating more fat and sugar than protien.