I think emotions are a huge part of weight gain and loss and yet most Western medicine seems to almost completely ignore the impact of emotions on the body. Try eating a lot of food when sad—it's hard to take even a bite. Yet it's hard to even realize just how much one is eating when anxious.

I also imagine the emotions impact digestion and storage of fats and a lot more, basically adapting our bodies to our perceived environments, so it kinda baffles me that we don't study the emotional impact more.