The primary ingredient in oatmeal is oats. Oats are whole grains that are harvested from the Avena sativa plant. They are a popular breakfast choice and can be prepared in various forms, such as rolled oats, steel-cut oats, or instant oats. Oats are celebrated for their nutritional benefits, including high fiber content, particularly soluble fiber called beta-glucan, which can help lower cholesterol levels. They are also a good source of protein, vitamins, and minerals, making oatmeal a healthy and filling option for a balanced diet.