I had to do mine for two weeks at three shakes a day, and it was really hard! I won't lie and say I didn't slip up here and there, but it was always tiny because anything more than a bite of something I knew I wasn't supposed to be having made me feel guilty but my head was totally more crazy than I thought it would have been but it got a lot easier I think as the days went on! The shakes got a little worse though, I was starting to just get sick of the taste after a few days but I found that adding more or less Water or ice really helped with that. Good luck though! Keep busy! I think if i kept a little more busier than I did it would have been ten million times more easier.