I asked Dr. Peat to rate grains in order of which he felt was best to worst. He said, " masa harina (best), white rice or oats, and brown rice." Then he added, " The phytic acid in the oats block absorption of much of the calcium; cooking the oats much longer than usual might improve its nutritional value."

I don't think he is a fan of grains in general and feels there are nutritionally superior carbohydrate choices available. You can read more on his thoughts on the subect in his "Glycemia, starch, and sugar in context" article.
http://raypeat.com/articles/articles/glycemia.shtml

Cathy