Half of your grains are supposed to be whole, says the USDA—a guideline most Americans have a tough time meeting. Plus, eating a breakfast that includes whole grains, such as oatmeal, whole-grain cereals or whole-wheat bagels and toast (which are slower-burning or low-glycemic-index carbs)—instead of “white” carbs, such as refined cereals, white bagels and bread, pancakes and muffins made from all-purpose flour—has been shown to help kids concentrate and pay attention. I don’t see why the same wouldn’t apply to adults.