You only eat eggs, cheese and fats/oils for 3-5 days. I lasted 4 days this time around. I can do it easily because I love eggs but went to a party last night and had a couple of zero sugar alcoholic drinks then when we got home my boyfriend cooked sausages and fried up some mushrooms in butter (mushies are my favourite food ever). If you google egg fast and go to images the one with the yellow background is the one I follow. It says mamasgeeky.com on the bottom of it but I just got it from Google images not their website.