@dorsalcolumn:
People change. Every second and every day. And what holds now as a rule might change tomorrow. When you are with the same person for so long you might not care if they lost weight or not. Some people might be excited about being big guys at some point, getting bigger, then losing weight at another point, then becoming more muscled, etc. There's no right or wrong, it depends on the situation. It is not your obligation to advise people on how to live your life, but it's an ethical thing to make sure that say someone who is overweight and diabetic understands that there is a strong tie between his weight and the severity of his disease. Then again, that should be up to his doctor. It's a very tortuous subject but it's never wrong to ease into it with someone, and having vulnerabilities is always a nice thing to show.
Yeah, that's true… However, while people naturally change as they get older, at the same time, human beings are also creatures of habit. Sometimes it takes decades of life experience before people change, and sometimes not even then. I actually think the percentage of people that change their views on certain subject matters are a lot smaller than people think.