Megan Ramos, IDM Co-founder and Program Director, wrote one of the most recent IDM weekly blogs. If you haven't been reading IDM's weekly blog posts you have been missing out! Both Megan and Dr. Jason Fung participate in writing these.
One of the latest blog posts was about Fat Fasting (aka Fat Feasting). I prefer to call it "feasting" because unlike a fast, which is abstaining from mostly all food and drinks (except water and a few fasting aids), a Fat Feast encourages an adequate amount of these foods when hungry and until full: