One of the things that can be the most difficult in achieving your perfect body is getting to the right goal weight and maintaining that weight. A diuretic is any substance that promotes the production of urine. This includes forced diuresis. All diuretics increase the excretion of water from bodies. Diuretics increase the urine volume to rapidly lose weight to meet a weight category in sports like boxing, wrestling and others. Below are supplements that increase fluid removal (diuretics).