According to the study authors, fatty foods can deplete hair-follicle stem cells, During a normal hair growth cycle, hair-follicle stem cells activate and replenish themselves to create a healthy root, resulting in hair growth. In an abnormal cycle, these stem cells fail to activate. The researchers concluded that a high-fat diet could contribute to an abnormal cycle by introducing inflammatory molecules into the body. These molecules cause oxidative stress and block the regeneration of hair follicles, resulting in smaller follicles and faster hair loss.