When you lose weight where does all the fat go is it lost through urine sweat and excrements - gastric bypass patients tons of in a few months do they out?

Fat loss primarily occurs through the process of cellular respiration, where the body breaks down stored triglycerides (fats) into carbon dioxide and water. These byproducts are then expelled from the body through various channels:

1. Respiration (Breathing): The majority of the carbon dioxide produced during fat oxidation is released through exhalation during breathing.

2. Urine: A small portion of the carbon released during fat metabolism ends up in the bloodstream as bicarbonate, which can be excreted through the kidneys in urine.

3. Sweat: Trace amounts of fat metabolites can be excreted through perspiration through the skin.

4. Excrement: While not a significant pathway for fat loss, some undigested fats and fat-soluble vitamins may be eliminated through the digestive tract and feces.

It's important to note that the primary route of fat loss is through the lungs as carbon dioxide. The weight lost by gastric bypass patients is mostly due to the breakdown and release of stored fat in the body. The rapid weight loss they experience is a result of the significant reduction in food intake and the hormonal changes that occur after the surgery.