Most processed products made with wheat, corn, rice, and potatoes belong in this group. Reduce or avoid refined wheat products such as bread, pasta, waffles, muffins, cupcakes, and donuts. Limit processed corn products, such as popcorn, corn chips, and tortillas, and refined potato products, particularly french fries and potato chips. And eat white rice, which is also a refined carbohydrate, in small amounts. High-fructose corn syrup contains 55 percent fructose, which means it’s sugar, not corn. It’s found in many processed food products and should be avoided.