The programme was put collectively by Psychologists, Dieticians and Fitness consultants. Oz on Monday's present. There's a problem with diets: They don't work. A Californian doctor, Lulu Hunt Peters introduced calories as a mainstream concept (that they had formerly been used by scientists) in her guide Food plan and Health, with the Key to the Energy Like Banting, her interest in dieting seems to have been sparked by her own need to shed weight.