The starches of today are very different than the starches our ancestors ate. I am a firm believer in the Blood Type Diet . Type A's can tolerate grains. Type O's and B's cannot tolerate grains. I have seen this to work many many times. I am an O and cannot tolerate grains at all. I do better with a paleo diet; however, I do believe lots of fruits and complex carbs are needed as well. Not starches.