I am trying an 8 week challenge, to reduce body fat. I exercise 6 days a week (to high intensity) and now doing the diet to compliment this (to give me muscle definition) but I can't have carbs, dairy, sugar caffeine or booze. Have survived 2 days but going through 2 weeks of this phase seems impossible. I nearly fainted in the gym. Is it possible or have a bitten off more than I can chew ! Any advice or do I just need to dig in ?