Following in the footsteps of so many meal plans circulating the interweb today, intermittent fasting takes center stage once again in the OMAD diet. One Meal A Day may sound almost like starving, but tapping into autophagy may pose more benefits than risks for many people.. According to American neuroscientist Dr. Mark Mattson, in a research paper he. I have found that having one meal ranging from 800-1000 calories and a 300-400 calorie snack, is what works for my body on many days. I also count my macros to ensure I’m staying under 20 grams.