Rolled oats (sometimes called old fashioned oats) are created when oat groats are steamed and then rolled into flakes. This process stabilizes the healthy oils in the oats, so they stay fresh longer, and helps the oats cook faster, by creating a greater surface area. There are approximately 400 calories in 100 grams of Rolled Oats. The content comes with Vitamin B1, Vitamin B5 and minerals also high in dietary fibre and contains beta-glucan, a soluble fibre with cholesterol-lowering properties.