A quick Google search will tell you more, I think it was developed by low carb guru, author and podcaster Jimmy Moore of Livin La Vida Low Carb. You have at least six eggs per day and must have a tablespoon of butter or other allowed fat for each egg. You can also have an ounce (28 g) of cheese for each egg but they recommend you have less. Anyway the bloggers I found claimed to have dropped like 5-7 pounds in those 3-5 days. You will regain half a pound or more when you go off, depending on how gently you transition back, e.g. don't go nuts your first day off. In fact have 1-2 egg meals and one regular LCHF meal and transition back slowly. Most said they kept most of the weight off. My experience?
I did it from Sunday to Thursday last week, transitioning off on Friday and Saturday. I found a couple of delicious recipes which I saved for later in the week in case I tired of eggs, as most said they did ... but I didn't really. I love eggs. Monday I had dropped over a pound and a half. Then I stayed the same Tuesday. Wednesday I dropped about 3/4 of a pound and stayed there the rest of the time. About half that weight came back after my first transition day and the rest after the second. Very frustrating. I am starting to think I am not only never going to see goal, but I'm going to struggle to maintain the loss I have!
Not giving up, just beyond frustrated. I fasted completely today and will resume alternate day fasting this week along with eating much less on the days I do eat. Still sticking to LCHF. That's all I got.