The whole oat grain (hull removed). Requires 50-60 minute cooking time or overnight soaking — a legitimate slow food. One cup cooked provides 6g fiber (4g soluble beta-glucan), 7g protein, 34% DV magnesium, 22% DV phosphorus, and avenanthramides — oat-specific antioxidants with documented cardiovascular and skin-soothing properties. Higher fiber and lower glycemic index than any processed oat form.
Available at health food stores and online (Bob's Red Mill). Less common at mainstream stores than rolled oats. Affordable per pound.
Beta-glucan from oats has one of the only FDA-qualified health claims: 3g of oat beta-glucan per day reduces total cholesterol and LDL cholesterol. The mechanism: beta-glucan forms a viscous gel in the intestine that binds bile acids (made from cholesterol), removing them from circulation and forcing the liver to make more bile from blood cholesterol — drawing cholesterol out of the bloodstream. One cup of oat groats provides this therapeutic beta-glucan dose. Avenanthramides are oat-specific polyphenols that reduce the expression of adhesion molecules in arterial walls — the first step in atherosclerosis (plaque formation). Oat groats provide the highest avenanthramide content of any oat form.
Overnight: soak 1 cup oat groats in 2 cups water overnight, drain, simmer 20-25 minutes (significantly shorter than unsoaked). Next day: creamy, nutty, deeply satisfying. Or simmer directly 50-60 minutes. Use as a hot breakfast porridge — richer and chewier than rolled oats. Pressure cook: 15 minutes. Instant Pot: 3 minutes manual high pressure.
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