To supplement all of that without food is certainly possible, but not easy without a ton of research and a plan. Given that most people cannot stick to a normal reduced-calorie diet, it’s a leap to think that full-on fasting will be possible for the general populous.

That said, I do intermittent fasting all the time, and occasionally do a 24-36 hour fast if I feel I need it. I don’t have an eating disorder, but there are times where my calorie surplus gets away from me during family occasions. The longer fasts help me get back on track, especially in tandem with a hard weightlifting workout at the gym to use that surplus to its fullest potential.