Because they lack the willpower do deal with the consequences of losing weight, obsiously it's not fun being hungry.
You had a lot of extra fun stuffing yourself with food, you will have to pay the price for that at some point(either with hunger or with health problems if you don't lose the weight)
You had a lot of extra fun stuffing yourself with food, you will have to pay the price for that at some point(either with hunger or with health problems if you don't lose the weight)