I spent most of my life grossly underweight. I would have to eat until I was stuffed to keep from losing weight. I had a hard time finding clothes that fit, and being a guy, I was pretty much scorned as too scrawny. Then I hit middle age and my metabolism changed and I gained weight, then I quit smoking and gained even more. Now I’m overweight and can’t seem to lose weight no matter what I do. I’ve seen it from both sides of the problem, and neither one is good.