A review of major heart health studies published in the Nutrition, Metabolism & Cardiovascular Diseases journal found that people who consume at least 2.5 servings of whole grains a day have a 21 percent lower risk of developing a cardiovascular disease than those who eat two (or less) servings of whole grains a week.
This figure takes into account other dietary changes, so it goes beyond the idea that individuals who eat higher amounts of whole grains have healthier overall diets.
Keep in mind that grain servings are quite small — a mere half cup of cooked brown rice, whole wheat pasta, and oatmeal all count.
The idea here is to replace as many of the refined grain products in your diet (white rice, white bread, etc.) with whole grain ones, not simply add whole grain foods to your current diet.