There have been lots of thoughtful comments in the subthread under your original comment explaining people's experiences with this and why it isn't so simple. Have you read them? What deficiency do you find in them?
It seems like you're just interested in repeating yourself louder & meaner and not interested in engaging, presumably because you think you already know everything there is to know about other people's lives. Rather solipsistic really.
I hope you'll reconsider but if that's how you're going to behave there's no productive conversation to be had.
It's very simple to lose weight, it really is, just don't eat. The problem is that it's not fun(hunger is not fun, obviously).
But the bill comes for the extra fun you had with food, it's either hunger or serious health issues.