Oatmeal (rolled oats, cooked): GI, GL, Carbs & Blood Sugar Impact
Glycemic index of rolled oats (55), glycemic load, carbs per cup, instant vs rolled oats, and diabetes-friendly oatmeal.
Does Oatmeal Raise Blood Sugar?
Rolled oats cooked with water carry about 28 g of carbohydrate per cup with a published GI around 55 — moderate, with real fiber. The trap is the versions around it: instant/quick oats test considerably higher, and sugar, honey and dried-fruit toppings add a fast carbohydrate hit.
How to Eat It
Rolled (not instant) oats, cooked with water or milk, topped with berries and nuts rather than sugar and syrup. A normal bowl fits most diabetes-friendly plans.
Nutrition Facts (Oatmeal (rolled oats, cooked))
| Nutrient | Per 100 g | Per serving |
|---|---|---|
| Calories | 71 kcal | 166 kcal |
| Carbohydrate | 12.1 g | 28.3 g |
| Fiber | 1.7 g | 4.0 g |
| Sugars | 0.3 g | 0.7 g |
| Protein | 2.4 g | 5.6 g |
| Fat | 1.5 g | 3.5 g |
Source: USDA FoodData Central (generic food item, per 100 g edible portion). Values may differ from brand-specific products.
Glycemic Index
Published GI: 55 (typical value).
Reported range: 55-83.
Evidence level: Moderate.
Note: Rolled oats test around 55; instant/quick oats test considerably higher (75+).
Sources: International Tables of Glycemic Index and Glycemic Load Values (2008/2021); University of Sydney GI Database (glycemicindex.com). GI values are reported relative to a glucose reference.
Learn more: What is GI? · What is GL? · GI vs GL
Estimated Glycemic Load
GL ≈ 13.4 per 1 cup cooked with water (234 g).
Calculation: GI (55) × available carbohydrate per serving (24.3 g = 12.1 g − 1.7 g fiber) ÷ 100. Calculated by DMSafeHaven; formula per standard published GL methodology.
- Rolled vs. instant oats
- Toppings (sugar, honey, dried fruit)
- Portion size
GI values can vary with variety, ripeness, preparation and testing conditions. The value above is a typical published figure, not a universal prediction for every individual or every serving.