My sister did it about 6 weeks ago and was very ill ....the drop in food intake is very hard for the body to cope with. - She had severe diarrhea (sp), headaches, shakes, nausea, vomitting..... and that was only after 2 days, she didn't even complete the full 5-7 days and said it was an absolute waste of money.....The fact that the drink is spicy is what is supposedly meant to "kick start" your metabolism - for my sister it kick started her bowels, in the wrong way!