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?

You started intermittent fasting a whole week ago. This morning, you stood on the scale, looked at that irritating number that somehow has the staying power of a red wine stain on white carpet, and thought, How long does it take for this intermittent fasting thing to work, anyway? Now you're hovering anxiously over your fasting tracker, wishing you could speed things up but feeling stumped on how to do so.