There's no evidence that dirty fasting is as effective as traditional fasting methods — which involve complete calorie restriction during fasting periods — for promoting these potential benefits.

How many calories can you have on a dirty fast?

Dirty fasting is when you eat foods or beverages that are under 50 calories during your fasting window. Your fasting is dirty if you add a bit of creamer to your coffee, or sip on tasty bone broth.

What is allowed during dirty fasting?

Think of it as the opposite of "clean fasting." Clean fasting implies fasting where none or very little food is consumed and only water and non-caloric beverages are allowed. Dirty fasting, on the other hand, is a form of modified fasting that allows the addition of a certain number of calories during the fast.