How many calories are there in coffee?

According to Mayo Clinic, a single 8-ounce cup of black coffee contains only 2 calories and no fat. Adding sugar, milk or other creams to the coffee increases the calorie count. Adding a tablespoon of sugar and heavy cream adds about 100 calories to 8 ounces of coffee.

According to WebMD, a cup of coffee per day may reduce the chances of developing type-2 diabetes and Alzheimer's disease. Coffee also contains antioxidants that may boost the immune system and prevent damage by free radicals. While a cup of coffee per day can provide health benefits, 2 to 3 cups a day or more may cause high blood pressure.