>>9532515
Anon explained it poorly, but what happens is that people gain the weight back because they're not burning fat, they're burning muscle. Then when they binge, they regain fat, not muscle.
Less muscle, more fat, body in fasting mode = less calories burned. People usually have no idea of their %s, so they end up eating the same amount of calories while burning less, giving the impression that the calorie counting isn't working.