The document outlines various intermittent fasting methods, including the 5:2 diet, Eat Stop Eat, and the 16/8 method. The 5:2 diet involves eating normally for 5 days and restricting calories to 500-600 on 2 days, while Eat Stop Eat consists of a 24-hour fast once or twice a week, and the 16/8 method entails fasting for 14-16 hours each day with an 8-10 hour eating window. The 16/8 method is noted as being the most popular and sustainable approach.