A large percentage of Americans and asians are blood type A and should be vegetarians according to many including my MD.
Humans have always consumed alot of fruit which is high in carbohydrates.One study showing a correlation between grain consumption and kidney cancer does'nt show a causal connection . A diet high in protein is proven to cause kidney failure.Grains have various trace minerals that other foods don't have.Is there any evidence that people who eat a high carbohydrate diet have an increased incidence of cancer or other serious diseases?I think the opposite is true..We have enzymes to digest grains.Maybe the bloating and other problems are from poor food combining.
If you have sugar with a meal you should'nt get a sugar rush becuase the overall glycemic index won't be that high .When you have a high glycemic food between meals ,you get a sugsr rush.