Oats are particularly rich in avenanthramide, an antioxidant that protects the heart. When you’re shopping for this whole grain, whether you see the word “whole” or not doesn’t matter, the way it does with wheat products. Oats in the ingredients list means the product is made from whole oats. But if you are buying something like instant oatmeal, avoid those that contain high-fructose corn syrup. A study this year found that ingredient was a source of mercury contamination in oatmeal. We suggest sticking to the good old-fashioned unsweetened kind and mixing in a little fruit or honey.