The text provides information about junk food. It defines junk food as food that is of little nutritional value and often high in fat, sugar, salt, and calories. Junk foods typically contain high levels of calories from sugar or fat with little protein, vitamins or minerals. Examples of foods commonly considered junk foods include salted snack foods, gum, candy, sweet desserts, fried fast food, and sugary carbonated beverages. However, some foods like hamburgers and pizza can be considered either healthy or junk depending on their ingredients and preparation methods.