At first I assumed I was a lazy fuck who ate too much, but spending many hours walking a week and watching what I eat, it's not that bad. It would make sense for me to be overweight, I often pig out a little on nuts or chocolate, but the degree to which, what I'm consuming, isn't really enough to make me as big as I am.

Due to the unbalanced distribution of the fat I'm thinking it could be a glandular problem or something similar. I'm usually fairly drowsy, drained of energy and uncomfortable. My blood sugar level is normal.

TL;DR what health problems tend to lead to metabolism problems/general weight gain.