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Estimated changes in hormones after long-term intermittent fasting in human (dashed line). X axis presents daily light cycle: light box means daytime (6:00 AM–6:00 PM) and dark box indicates nighttime (6:00 PM–6:00 AM). Normal circadian rhythms of hormones were presented with solid line. (A) Insulin; postprandial peaks were depicted after breakfast (7:00 AM), lunch (12:00 PM), and dinner (6:00 PM). (B) Triiodothyronine. (C) Cortisol.
