I'm a bit skeptical to the claim that whole grains is a nearly perfect food, though. Think about it - we apes have not eaten huge amounts of grains for most of evolution. Also grains contain various anti-nutrients, otherwise they would have been eaten by insects. It does not seem inconceivable that some of these insect-harming anti-nutrients could also be harmful for humans.
Many dietary studies are done with rodents, but I think (I'm not an expert here) rodents have eaten far more grains than apes during most of evolution. So studies with rodents showing that high-grain diets are healthy, are perhaps showing just that - that high-grain diets are healthy for rodents (and not necessarily apes).