Rather than throw a dry medical study link at you, this site does a really nice job of summing up in layman's terms how grains are being bashed by their critics who are sadly misinformed (and in some cases, outright disingenuous):Gumby wrote: - Grains are full of phytates, lectins and toxins and fiber that tends to be harsh on the gut.
Dissecting the Myth: Why Grains and Gluten Aren’t Bad for You
Most of the anti-grain resources you'll find online are either proponents of the paleo diet or else proponents of so-called "alternative medicine" (such as chiropractic and homeopathy). Unless you are particularly sensitive to grains (such as a gluten allergy or celiac disease) they should pose no problem to you if eaten in moderation (just like everything else you eat).
Grains can be stored, measured, and transported far more readily than nearly any other food crop. The advent of grain agriculture allowed excess food to be produced and stored easily which in all likelihood led to the creation of the first permanent settlements and the division of society into classes. The pyramids were built by workers for whom grains formed a substantial portion of the carbohydrate fuel their bodies needed.
In sum, to be anti-grain is to be anti-civilization, not to mention anti-humanity. Much of mankind relies on grains for a large portion of their sustenance, and a goodly percentage of them would starve to death without grains. To dismiss grains as somehow harmful and something to be avoided is, in a word, shameful.