The document discusses a food pyramid model for categorizing foods based on their healthiness. It explains that the first layer of the pyramid contains the most healthy foods like fruits and vegetables. The second layer contains foods that are also quite healthy, such as pasta, bread, rice and potatoes. The third layer contains foods that are still good for you, including fish, cheese, milk and meat. The top of the pyramid contains the least healthy foods like sweets, fats, oils and soil.