I can't quite believe that I've been doing the Fast Diet for 11 weeks! 11 whole weeks! It's flying by. For those who don't know, the Fast Diet (eating 500 calories for women, 600 for men 2 days a week then normally for 5 days) was conceived by Dr Moseley who researched diets which aided health and longevity on his BBC Horizon documentary, Eat, Fast and Live Longer.