"i am on the ir version and i agree with the person who commented that you forget to eat.  i have lost 12 pounds over the last six months and i have to remember to eat.  as they stated i do get foggy headed and kind of high feeling at times, but when i eat something and remember to take my vitamins since i don&#039;t eat as much i am fine.  i am older and i did it so i could study for the cpa exam because i could not keep my mind focused on the study materials.  my work performance has improved phenomenally as well.  my boss noticed at my next review and even commented that i seemed different.  my attention to detail had improved and i was staying focused on my tasks so much better.  makes me wish i had done something like this long ago."