In reply to Sairamnath.

The reason we eat about 5% of our calories in carbs is that going above a certain amount of carbs per day (range is from 25-50 grams of net carbs) will kick you out of ketosis. Realistically, intermittent fasting will be beneficial whether or not you're on a keto diet. With a keto diet, your body is already in fat-burning mode and intermittent fasting is meant to put you into ketosis quickly as well. There is likely an added benefit to fat burning when doing both.