Coffee and Caffeine FAQ

I have found that many diets recommend the elimination of caffeine as one step. It seems that I have read that caffeine boosts your metabolism and therefore it seems counter intuitive, to me at least, that one should stop caffeine intake as part of a diet. Can anyone explain why stopping caffeine would help in a diet if stopping it removes something which was helping your body maintain a higher metabolism rate ? Seems like without the caffeine, your metabolism would slow and make it harder to loose weight.

Thanks