The process of breaking down triglycerides into reusable energy is called lipolysis which is shuffled and reshuffled to produce heat water carbon dioxide and ATP. Since the fat tissue has lost some of its components the cells shrink. Why the Extra Skin When fat tissue is worked and the cells shrink wouldnt it make sense that your skin would shrink as well Yes and no. In the cases of moderate weight loss skin can certainly shrink back to fit the body new size because of its elasticity due to collagen in the skin. https://ketopromos.com/ultra-fast-keto-boost/