It is a pattern of eating where you restrict the hours that you eat. In my book, and around this site, we refer to this as “eating windows”. You open your eating window when you consume your first meal or snack of the day, and you close your eating window after your last calorie is consumed. There is no magic number of hours each person should remain in their eating window, some people have found that 8 hours work for them, for some it is 6 hours, and others will only eat one meal a day. But the gist of this lifestyle is that you are not restricting the types of food you eat, but instead the hours in which you eat.