The solid science is restricting calories is the key to weight loss, and beneficial for diseases like type 2 diabetes.
Any study that shows IF benefits to ameliorate a disease would need to control for caloric restriction.
The way it works is that it provides a very easy framework to make it easier for someone to eat less than if they were not fasting.
If they fasted but still ate an equal amount or more in the allowed eating window then it does not work.
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