Obesity/leg swelling. Ironically, the larger one is the less water weight and more body fat they have. When the body's water mass falls to about 42% or lower, we see leg swelling as seen in many bariartic practicies with obese patient. Ddrink more water; get your water and fat mass checked . Water pills usually make this worse. The other mechanisms of less exercise and decreased venous flow can contribute as well.
Obesity & swelling. There are two mechanisms by which obesity tends to cause leg swelling (edema). Excess weight tends to compress the veins that are supposed to take fluid out of your legs. Also obesity is usually associated with getting less exercise which is important for helping the veins to do their job. One final thought is that obesity is associated with an increased risk of clots which can cause leg swelling.