Modified fasting is a type of intermittent fasting and includes some time-restricted eating.  A 12-hour feeding window is basic common sense for good health. This is something we should be practicing all year long and doesn’t quite qualify as fasting. For autophagy to really kick in, a modified fast of 600-800 calories is needed, in addition to maintaining an “eating window” of 8-12 hours each day during the modified fast.  Throughout history, people have limited their “eating window” from 7 am to 7 pm or even shorter; the modern American phenomenon of eating all day and even into the night is a product of cheap, easily available food.