I fat fasted last summer. i didn't cheat, i was on it for five days and didn't lose anything, not an inch, not a pound, nothing! and it didn't boost my weight loss when i went back onto my regular lc'ing. i ate the servings of cream cheese, drank cream occasionally, did the egg yolk and mayo (which wasn't a great idea. i have a slight egg allergy and eating those really made me sick so i had to cut them out). also i had macademia nuts, uhm...that seems like all. i tried to block it from my memory i guess :-). i don't think i would do it again.