Weight loss may be a good thing for many people. It can help to reduce your risk of health complications and may even extend your life if you are overweight or obese. However, with weight loss comes various changes to the body. One of those changes can sometimes be hair loss. You may be unsure why your weight loss is contributing to hair loss, but understanding the role is key to knowing what to do to treat it. For most people, this is not a long-term complication, and hair will grow back within a short time.