We need no grains, potatoes, rice, processed sugars, etc. When our DNA was developing, for 5 million years we ate no grains, dairy, processed sugar, or soy. The fruit and vegetables we ate were super low glycemic load. The total carbs we ate were the equivalent of 22 teaspoons of sugar a year. Now we are consuming over 22 teaspoons of sugar a day, in fact 1/2 pound of wheat and 1/2 pound of sugar a day is the national average. High insulin, from eating high glycemic load carbohydrates, is what causes most all chronic diseases - obesity, type 2 diabetes, high blood pressure, heart disease, stroke, cancer, inflammatory diseases, and dementia, especially Alzheimers. 1/2 pound of wheat has the same effect on your blood sugar as eating about 3/4 pound of table sugar. That's why we're diabetic.