Time-restreating is actually based on the principles of circadian rhythms. Circadian rhythms are daily timetable that are present in every cell, in every organ on our body and also in brain. And if we be on time with our circadian clock, then our physical, emotional, and intellectual performance will reach a to speak level. Time restricted eating can which means that we have to restrict all our calorie-containing food and beverages to certain times during the day.