try looking at the www.atkinsdiet.com this uses a diet(or not) which is not a celeb fad diet. It has been used sussefully but many people inluding me and bodybuilders for the past 30 ys or so. If you follow the induction for two weeks you will lose body fat and still ahve plenty of energy to run. I started it at 15 1/2st and know weight 14 1/2 in 2.5 weeks feel fine. I ran swam and worked 12 h shifts. Try reading the scientific basis of the diet to give your self an understanding of what is happening to your body whilst using this method therfore you will appriciate the way you need to eat.