The 5 2 Diet is a tried-and-true method for losing weight quickly. The innovative 5 2 Diet, also known as "Intermittent Fasting," helps you to lose weight by eating low-calorie meals just two days a week. You may eat anything you like five days a week and follow an easy fasting regimen for the other two days on a fast diet, and you'll lose weight faster than ever before. That's all there is to the 5 2 Diet!