What foods should diabetics avoid? They are likely some former favorites, such as bacon, French fries, and dairy products. A person with diabetes should stay away from processed foods, especially refined carbohydrates. For instance, pizza night should likely be canceled. Other high-glycemic-index foods diabetics should avoid include many wheat flour products, white potatoes, white rice, candy, sodas, many cereal products, and especially sugar itself. Alcohol and caffeine consumption should also be limited. Fruits high in natural sugar, such as bananas, peaches, and nectarines, should also be avoided.