Probably any or all of those plus genetics and I think also nutrition and overall health of the skin. If one is deficient in certain vitamins or minerals that are used or needed by the skin, there has to be some kind of effect, but age and genetics and even how the weight is gained and where it goes may all play a role.
If the fat is behind the abdominal wall, the belly is probably more solid and round. If the fat is between the wall and the skin, that's probably more shaped by gravity and the persons clothing. I do think some people wear clothing that alters their natural shape.
8 years
