Because the fat tissue has lost some of its additives, the cells cut back. Why the extra skin? When fat tissue is worked and the cells cut back, wouldn't it make sense that your skin might decrease as nicely? Sure and no. Within the instances of mild weight loss, skin can absolutely shrink back to suit the body's new length because of its elasticity due to collagen inside the pores and skin. But, collagen does have its limits. Collagen fibers weaken with age and results in wrinkles.