Its actually not too bad. I thought it would be worse, the only problem ive had that cleared up, was having a headache for couple days cause of the caffeine withdrawal(i use to drink alot of coffee until now.) When i started the other day, i went in it with a clear head and im actually only consuming around 500 calories cause of the sugar free Jello/pudding and sugar free popsicle's. the only thing that really has any calories is the proteins shake. I think cause i started the liquids with a clear mind, i really dont feel all that hungry either.