He believes that gravity pulls down the skin on the scalp, which causes hair loss in men. His theory is that young men have a good amount of fat tissue under their skin that is able to stay well hydrated, taking the pressure off of hair follicles. As men age, however, the skin and fat underneath becomes thinner and less hydrated, putting more pressure on the hair follicles. As the cushioning of fat decreases, the idea is that the hair follicle has to work harder against the pressure; it requires more hormones for normal growth.