The most intact and whole form of oats are oat groats, which take a long time to cook. For this reason, many people prefer rolled, crushed, or steel-cut oats.
Instant (quick) oats are the most highly processed variety. While they take the shortest time to cook, the texture may be mushy.
Oats are commonly eaten for breakfast as oatmeal, which is made by boiling oats in water or milk. Oatmeal is often referred to as porridge.
Whole oats are high in antioxidants and beneficial plant compounds called polyphenols. Most notable is a unique group of antioxidants called avenanthramides