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This is certainly my experience - I've found it much easier to fast 18 hours per day (a bit less on the weekends) than to try to adhere to a caloric restriction over a full day. I think that for me it requires less willpower to have fixed start and end times for eating.

The blood sugar spike and trough (from eating recently) is what makes you feel hungry. So avoiding that can make it easier to eat less.

Yes, due to upregulated authophagy, another point the study ignored.

Another benefit of IH is the dramatically increased HGH production. Not sure if calorie restriction has similar numbers.