What bothers me is that many granting agencies believe fasting is bad and won't fund studies on fasts longer than 16 hrs. Instead, researchers are coming up with "fast-mimicking" diets that are really just low-calorie diets with mini-meals/snacks throughout the day for 8-16 hrs. Even if very low carb, they will not simulate true fasts as they keep insulin pumping and growth hormone suppressed, making it impossible to get data on true fasts and autophagy.