The least side effect should be black coffee. Be careful not to overdo it. Moderate drinking is good for health. Black coffee in coffee helps to lose weight. Weight loss coffee just changed his name. If you add moderate exercise, the effect will be better. When drinking this kind of coffee, I suggest you buy coffee beans and make them yourself. Do not buy instant coffee powder. Natural coffee beans are the safest. Too many additives in instant coffee are bad for your health.

hope this helps