Dieting yoyo

I hate it but I have become convinced that you weigh what your destiny says you will weigh and trying to lose weight through will power and drugs creates a yo-yo and you put it back on with a little extra.  Exercise is good but only leads to a fit fat person, not bad but not good either.  Trying to diet permanently is like trying to hold your breath permanently, and changing your diet to healthy foods, while good for other reasons, only causes you to eat more to get the same calories.