Black coffee has an element called chlorogenic acid, which is known to speed-up weight loss. If you consume black coffee after supper or dinner, the presence of chlorogenic acid slows down the production of glucose in the body. Moreover, the production of new fat cells is decreased, meaning lesser calories in the body.
Skin benefit that comes from drinking coffee is that it can help to fight against skin cancers like malignant melanoma and basal cell carcinoma due to its high level of antioxidants and anti-inflammatory compounds.
Drinking coffee on an empty stomach could damage your stomach lining and cause indigestion and heartburn. It can even increase anxiety and hinder your ability to focus. Instead, try drinking coffee in the mid-morning or early-afternoon for the best results.