In this straightforward but groundbreaking new book, Jessica Irvine documents her own dramatic weight loss and equips you with easy-to-use tools and practical information to help you lose weight.Based on interviews with leading obesity researchers, Jessica shows you how to work out your own bottom line - the number of calories your body uses in a day - for maximum weight-loss results. Then, once you've lost weight, she shows you how to keep it off and, should you happen to put some kilos back on, how to lose it again (like she did).Packed full of personal tips, Jessica explains the simple accounting principles she used to lose weight and then maintain her weight loss. Let Jessica help you beat the odds to transform your body forever.'Weight loss comes down not to fad diets but to one very simple rule: you must consume fewer calories than you burn in a day. If you're putting on weight, you're failing to balance the books by eating too much or not moving enough, or both. It's time to figure out which.'