Dr Pennington recommends a calorically unrestricted diet of protein and fat with restriction of carbohydrate
Treatment of OBESITY with Calorically UNRESTRICTED DIETS
Alfred W. Pennington
"Restriction of carbohydrate, alone, appears to make possible the treatment of obesity on a calorically unrestricted diet composed chiefly of protein and fat. The limiting factor on appetite, necessary to any treatment of obesity, appears to be provided by increased mobilization and utilization of fat, in conjunction with the homeostatic forces which normally regulate the appetite. Ketogensis appears to be a key factor in the increased utilization of fat. Treatment of obesity by this method appears to avoid the decline in the metabolism encountered in treatment by caloric restriction. Details of diet and regimen are given."