The document discusses the differences between fast food and junk food. Fast food is defined as food that can be prepared and served quickly, often sold in restaurants or stores with precooked ingredients. Junk food refers to food that has little nutritional value and is high in fat, sugar, salt, and calories. Examples of junk foods include salted snacks, candy, desserts, and fried fast food. Some foods like hamburgers and pizza can be considered either healthy or junk food depending on ingredients and cooking methods. The document also mentions that some countries have implemented taxes on foods high in saturated fat or other unhealthy components to encourage healthier eating.