The guy who cares about his health will be stronger, healther, more likely to be obese etc. However the guy who doesn't care about his health will more likely be obese, weaker, and not as healthy.
If you do not want to be placed in a mental institution, you should not tell them you are feeling suicidal or homicidal (but plz do if you feel that way I wouldn't want you to make a mistake you would regret)