The one meal a day (OMAD) diet is a type of time-restricted eating intermittent fasting schedule that involves — you guessed it — eating just one meal a day and fasting the rest of the time.

Intermittent fasting may be part of your quest for peak fitness. Maybe you're focused on exercising and eating for performance, which means getting plenty of protein.

If you're trying out intermittent fasting in the hope that it'll yield a positive result in your body, you may be curious about what's going on under the hood. What happens in your body during the various stages of intermittent fasting?