However staying in shape by becoming a gym bro spending hours a week lifting weights and chugging protein powder also has major effects on your mentality, and those aren't good effects.
Sure, and I maintain with healthy weight just on the normal walks around the village (although I did go slightly into the "overweight" category after one Christmas
The point is that it's very easy to go too far in the opposite direction, from being overweight to being a gym addict.