The fat fast is intended for metabolically changled people. Dr atkins modified it, its on his website, just look it up in the search engine. Basically you eat 4-5 small meals containing aproximently 200 calories each. These meals are high fat, low carbs. For example an oz of cream cheese, tuna w/ mayo, ect. You are not suppose to go over 1000 calories a day and you are suppose to continue this for 3-5 days. Now here is the thing, most people lose about 5 lbs and then gain it back. You have to spend a week after that eating a modified version of this (its listed in the atkins site) before you continue with your normal lc lifestyle. This is suppose to break stalls and put people into heavy ketosis. Ill let you know how it goes in a few days.