Intermittent fasting works on the same principle as any other diet or nutrition plan. Calories in / calories out. There is no secret trick or metabolism hack, it all comes down to burning more calories than you take in.
The reason people have succeeded using Intermittent fasting is because it gives them a way to manage their caloric intake in a way they can handle. By limiting the time in which they can eat, it limits the total amount of calories they can get in in a day. You still have to fall within your calorie count to make progress.
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