Eighty patients with insulin-sensitive diabetes were treated with a diet containing 20 to 30 g. fat, 120 to 150 g. protein, and carbohydrate according to energy requirement. Insulin dosage was progressively reduced as patients became sugar-free at each level. Most of the patients did not require insulin after 3 to 6 weeks. Some patients were able to dispense with insulin after 18 weeks and some continued to require small doses. In a follow-up study of the patients no longer requiring insulin, serial glucose tolerance tests were made on 7, of whom 5 showed a return to normal. FC Aitken.