20-4 intermittent fasting is a type of intermittent fasting (IF) that involves fasting for 20 hours each day and eating within a 4-hour window. For example, you might choose to fast from 7pm to 11am and eat all your meals between 11am and 3pm. 20-4 IF is a more advanced form of IF than 12-hour IF, and it is not suitable for everyone. It is important to talk to your doctor before starting 20-4...