While it's true that the caveman did not consume a lot of whole grains, the fact they have been with us for millennia and are considered an important part of some of the healthiest diets in the world lends credence to the idea that they are not only harmless but essential for achieving optimal health.

They're delicious too!

A donut made with whole-wheat flour is just slightly healthier that the refined wheat one, but that doesn't make it into a healthy food, and the whole wheat-ification might confuse us into forgetting it's a food to consume rarely.