Is Black Coffee Good For Health: Black coffee can be a part of a healthy diet when consumed in moderation. It is a rich source of antioxidants and can boost metabolism and energy levels. The caffeine in black coffee can improve alertness and focus. It has been associated with a reduced risk of certain diseases like type 2 diabetes, Parkinson's disease, and liver cancer. However, excessive consumption of black coffee can lead to side effects such as disrupted sleep, increased heart rate, and digestive issues. It is important to be mindful of individual tolerance to caffeine and not rely on black coffee as a sole source of hydration.