Oats vs Rice, white, long-grain, parboiled, enriched

Oats and white rice are both staple grains, but their nutritional profiles diverge dramatically. Oats pack 379 calories per 100g dry with 13.2g protein, 67.7g carbs, and an impressive 10.1g fiber including beta-glucan, a soluble fiber clinically proven to lower cholesterol. White rice delivers 123 calories per 100g cooked with 2.91g protein, 26g carbs, and just 0.9g fiber.

Comparing dry to cooked is misleading, so let's normalize: a typical 40g serving of dry oats (cooked into porridge) gives you about 152 calories, 5.3g protein, and 4g fiber. An equivalent 150g serving of cooked white rice provides 185 calories, 4.4g protein, and 1.35g fiber. Oats win on protein and fiber per calorie, while rice wins on versatility across cuisines.

The satiety difference is where oats truly shine. Beta-glucan forms a gel in your stomach that slows digestion dramatically, keeping you full for 3-4 hours after a bowl of oatmeal. White rice digests rapidly, which makes it better for quick energy but worse for appetite control. This single factor makes oats the superior choice for anyone in a caloric deficit.

The per-100g question deserves a straight answer, because the two headline numbers aren't measuring the same thing. The oat figures come from USDA FDC 173904 — rolled oats, dry, 379 calories per 100g — while the rice figures come from FDC 169708, white long-grain parboiled rice already cooked, 123 calories per 100g. Dry grain against cooked grain is mostly a water comparison. Cook the oats and the ranking flips: 40g of dry oats is 152 calories, and stirred into water it becomes roughly 250g of porridge, about 61 calories per 100g — half of rice's 123. So if you're weighing what's actually in the bowl, porridge is the lighter food per gram, not the heavier one. The exact number moves with how thick you cook it, since more water means fewer calories per 100g, but the direction doesn't.

Per 100 calories, a basis that cooking cannot change, oats carry 3.5g protein, 2.7g fiber and 17.9g carbs against rice's 2.4g protein, 0.7g fiber and 21.1g carbs. That's roughly 1.5 times the protein and 3.6 times the fiber for the same energy, and unlike the per-100g figures it holds at any serving size. One number runs the other way: rice wins on iron, 1.5mg per 100 calories against oats' 1.1mg. That's not the grain, it's the enrichment — this row is parboiled enriched white rice, with iron added back after milling, and unenriched white rice would not keep up.