I've heard it said in a way before, that changed my out look on beverages.
Anything other than water is considered an "energy drink". So anything with calories, calories = energy. Calorie restriction is the foundation of life longevity, and all of the benefits that come along with any type of fasting.
Everyone definitely over eats now-a-days, and it's slowly killing people sooner.
RE: Water Fasting-The Healthy Benefits