There’s nothing like the first week of the new year to start a diet and exercise regime, but if your motivation is disgust at the size of your waistband, you could be setting yourself up to fail. Successful slimming, according to Lisa Jackson, is all about banishing negativity and concentrating on loving everything you possibly can about yourself — even the Christmas excess. In her new book, Adore Yourself Slim, she sets out a sensible eating and exercise plan packed with clever tips to ensure weight loss is steady and effective.