Because if you destroy your metabolism with constant overeating, your body really doesn't know how to go 4 hours without food without very real and very shitty withdrawl symptoms (cold sweats, weakness, irritability). What fats don't realize is that your body adapts and if you actually suffer through this a few times, your body learns to manage it's resources better and you become capable of fasting for longer and longer without noticing or feeling discomfort. I try to snack on healthy things throughout the day (veggies, fruits, nuts), but I really end up eating one large meal a day. I'm so much happier without being tethered to the food cycle or worrying that I'm going to fall apart if I don't get calories every 2-3h.