It is impossible to get fat eating fat which is now obvious in people who observe a ketogenic diet. Muslims have fasting as part of their religious practice. Fasting for weight loss and to cure many autoimmune diseases including Type II diabetes has been practiced for hundreds of years. See my blog and Chapter 4 of my fasting series for many links and references. Fasting is not recommended by the medical establishment because they have no training in it and frankly, if you spent 7-9 years in school, had a 6 digit student loan, a house payment, and kids to put through school, would you recommend a therapy that is free to the patient?