The Happiest Way to Loose Weight. Finally a diet that can promise to put a smile on your face - and not just because you're not forced to live on salads. Lowri Turner's revolutionary weight-loss approach will improve your dieting experience and make it less likely that you will give up and go back to your old eating habits. A side-effect of most diets is to starve the body of 'happy' hormones such as serotonin tha actually help you stay slim. This book provides a questionnaire to help you identity which of your hormones may be causing you to gain weight.