What kind of fast should one be doing. >> If a patient is just simply looking to reduce his visceral fat, then I start with 1212, which means 12 hours you don't eat anything. You just drink liquids with no calories in it.And then 12 hours is your feeding period. We start with that and we do that for about 2 to 3 weeks. Then we quickly move to 186.186 means 6 hours you get to eat. 18 hours it's only water, black tea, black coffee, green tea, no calories. 186 186 and then that's one type of fasting.Now if a p ...