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After insulin, the most important thing to control diabetes is diet.
His diet should be high in protein and low in carbohydrate, such as Purina DM or Hills M/D. It also needs to be very consistent. He should be fed the same type of food, in the same amount, at the same time each day. I do not recommend using the Purina UR food (too high in carbohydrate), and I do not recommend switching diets.