Just adding another datapoint: With no particular dieting, I tend to hover around 95kg. I was able to get down to 80kg with smart dieting. But I was miserable at that weight.. I couldn't concentrate when programming, my brain kept interrupting me with hunger signals. I put the weight back on; I'd rather not live the rest of my life in hunger-misery. 20 years later and I'm still fine with that decision. I get plenty of exercise and eat lots of vegetables and take other steps to be healthy, but significant sustained weight loss with it's side effects is no longer desirable... until medicine comes up with a pill that removes the hunger itself w/o nasty side effects.