What are the causes of my big belly? Is it visceral fat around my organs or something else? I am 200 lbs, 5 11 , 74 years old. A former athlete but still exercise semi-regularly, play, teach and coach tennis. my diet is good but could improve. I can get to 190 lbs soon, but I can t see it helping much. I have some external fat around the belly but doesn t seem to be enough to make my belly this big. My top weight a few years ago was 220 to 227 for several years, I was on Prednizone for a year when my RA meds, Embrel stopped working.