Coffee has longevity and health benefits that are not due to caffeine alone. It has so many antioxidants you can count it as a serving of vegetables.

I tried caffeine pills in my misguided youth. They feel different, and one time I forgot I had already taken it and took a second—the resulting heart palpitations were some seriously scary stuff.

A black coffee is 2-3 calories and, when brewed properly, doesn't need anything added to be enjoyable.