Junk foods are highly processed foods that offer calories but lack nutrients. This article lists the top 5 junk foods as: 1) potato chips, which are high in fat and salt; 2) doughnuts, which are deep fried pastries that contain lots of sugar and fat; 3) cookies, which are baked goods made with butter, sugar and other refined ingredients but little nutritional value; 4) ice cream, which can be high in calories, sugar, and saturated fat with few vitamins and minerals; 5) candy, which mainly provides sugar and empty calories with little nutritional benefit.