Information from several clinical trials strongly supports the idea that type 2 diabetes is preventable. The Diabetes Prevention Program examined the effect of weight loss and increased exercise on the development of type 2 diabetes among men and women with high blood sugar readings that hadn’t yet crossed the line to diabetes. In the group assigned to weight loss and exercise, there were 58 percent fewer cases of diabetes after almost three years than in the group assigned to usual care. (10) Even after the program to promote lifestyle changes ended, the benefits persisted: The risk of diabetes was reduced, albeit to a lesser degree, over 10 years. (11) Similar results were seen in a Finnish study of weight loss, exercise, and dietary change, and in a Chinese study of exercise and dietary change. (12–15)
In reality, when people in a study followed the Paleolithic diet, it turned out the diet was lower in total energy, energy density, carbohydrates, dietary glycemic load, fiber, saturated fatty acids, and calcium; but higher in unsaturated fatty acids (good fats), dietary cholesterol, and several vitamins and minerals. Research also demonstrates that people with diabetes are less hungry, have more stable blood sugar, and feel better with lower carbohydrate diets.
Although most vegetable oils are in some ways healthier than animal fats, you will still want to keep them to a minimum. All fats and oils are highly concentrated in calories. A gram of any fat or oil contains 9 calories, compared with only 4 calories for a gram of carbohydrate. Avoid foods fried in oil, oily toppings, and olives, avocados, and peanut butter. Aim for no more than 2-3 grams of fat per serving of food, e.g., white or wheat bread, most cold cereals, watermelon, pineapple, baking potatoes, sugar.
Even if you have not been told that you have prediabetes, you could be worried about it, since 90% of the people with prediabetes are unaware that they have it. You are at higher risk if you are over 45 years old, do not get much exercise, have a family history of diabetes, or are African American, Native American, Hispanic/Latino, or Pacific Islander.