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Cornmeal is dried corn ground into a coarse, gritty flour, the base of cornbread, muffins, hush puppies and coatings for fried fish. Not all cornmeal is the same food: a whole-grain bag keeps the bran and germ, while the more common degermed kind has both removed and is usually enriched with B vitamins and iron. This guide covers the federal definitions, cornmeal nutrition from the USDA SR Legacy database, cornmeal vs corn flour, masa and cornstarch, and the gluten and food-safety facts worth knowing.
Peptide Labs does not sell cornmeal or corn products. This article is general nutrition information, not medical advice.
Key Takeaways
- Cornmeal is ground dried corn; FDA standards of identity define white, yellow, degerminated and enriched corn meals.
- Whole-grain cornmeal has about twice the fiber of degermed cornmeal and far more magnesium, per USDA.
- Enriched degermed cornmeal gets added thiamin, riboflavin, niacin, folic acid and iron.
- Corn flour is ground finer than cornmeal; masa harina is made from corn cooked in an alkaline solution; cornstarch is nearly pure starch.
- Corn is naturally gluten-free, but self-rising mixes can contain wheat and cross-contact happens.
What is cornmeal?
Under FDA standards of identity, white corn meal is made by grinding cleaned white corn to a set coarseness, and yellow corn meal is the same food made from yellow corn (21 CFR 137.250 and 137.275). This kind keeps roughly the fiber and fat of the original kernel, which is why it is sold as whole-grain or stone-ground. Degerminated corn meal is made by grinding the corn and removing the bran and germ, with lower limits on fiber and fat (21 CFR 137.265). Enriched corn meals add thiamin, riboflavin, niacin, folic acid and iron, with vitamin D and calcium optional (21 CFR 137.260).
Removing the germ takes out most of the fat, so degermed cornmeal keeps longer on the shelf. Whole-grain cornmeal keeps the oily germ; storing it airtight in a cool place or the freezer helps it stay fresh. Coarse cornmeal cooked into porridge is close to what is sold as grits or polenta, which have their own guides; this article sticks to the dry ingredient.
Cornmeal nutrition: USDA values
The table compares cornmeal types per 100 grams, a little under one cup, from USDA FoodData Central (SR Legacy), with percent Daily Values based on FDA reference amounts. White and yellow whole-grain cornmeal have the same values for these nutrients in USDA data.
| Nutrient per 100 g | Whole-grain yellow (FDC 169697) | Degermed, enriched (FDC 168867) | Degermed, unenriched (FDC 168929) |
|---|---|---|---|
| Calories | 362 | 370 | 370 |
| Fiber | 7.3 g (26% DV) | 3.9 g (14% DV) | 3.9 g (14% DV) |
| Protein | 8.1 g (16% DV) | 7.1 g (14% DV) | 7.1 g (14% DV) |
| Magnesium | 127 mg (30% DV) | 32 mg (8% DV) | 32 mg (8% DV) |
| Iron | 3.45 mg (19% DV) | 4.36 mg (24% DV) | 1.1 mg (6% DV) |
| Thiamin | 0.39 mg (32% DV) | 0.55 mg (46% DV) | 0.14 mg (12% DV) |
| Niacin | 3.6 mg (23% DV) | 5.0 mg (31% DV) | 1.0 mg (6% DV) |
| Folate | 25 mcg DFE (6% DV) | 335 mcg DFE (84% DV) | 30 mcg DFE (8% DV) |
| Zinc | 1.82 mg (17% DV) | 0.66 mg (6% DV) | 0.66 mg (6% DV) |
Three patterns stand out. First, whole-grain cornmeal is the clear fiber and mineral pick: per USDA, one cup (122 grams) supplies about 442 calories, 8.9 grams of fiber (32% DV) and 155 milligrams of magnesium (37% DV). See our high fiber foods and foods high in magnesium lists for context. Second, enrichment matters: enriched degermed cornmeal has much more folate, from added folic acid, and more iron, thiamin and niacin than the same meal without enrichment. Our folic acid and methylfolate guide and foods high in iron list explain those nutrients. Third, degermed cornmeal behaves more like a refined grain; the refined carbs guide explains what milling removes.
Color makes a small difference. Yellow cornmeal contains lutein and zeaxanthin, the carotenoid pigments that give it its color, while USDA lists almost none in white cornmeal. Our lutein guide covers what those pigments are. Cornmeal is mostly carbohydrate, with no cholesterol and little sugar in USDA data.
Cornmeal vs corn flour, masa and cornstarch
In the US, cornmeal vs corn flour is mostly a question of grind. Both come from dried corn; corn flour is milled to a fine, smooth powder, and cornmeal is coarser and gives a gritty, crumbly texture. In the UK and some recipes, “corn flour” means cornstarch, which is a different ingredient, so check the recipe’s origin. Masa harina is flour made from corn that was cooked and soaked in an alkaline solution, usually calcium hydroxide (lime), a Mesoamerican process called nixtamalization. That step is what lets masa form a dough for tortillas and tamales; plain cornmeal will not hold together the same way.
| Per 100 g (USDA) | Whole-grain cornmeal | Whole-grain corn flour | Masa flour, enriched | Cornstarch |
|---|---|---|---|---|
| FDC ID | 169697 | 170290 | 169749 | 169698 |
| Calories | 362 | 361 | 363 | 381 |
| Fiber | 7.3 g (26% DV) | 7.3 g (26% DV) | 6.4 g (23% DV) | 0.9 g (3% DV) |
| Protein | 8.1 g | 6.9 g | 8.5 g | 0.3 g |
| Iron | 3.45 mg (19% DV) | 2.38 mg (13% DV) | 8.5 mg (47% DV) | 0.47 mg (3% DV) |
| Calcium | 6 mg (0% DV) | 7 mg (1% DV) | 138 mg (11% DV) | 2 mg (0% DV) |
| Texture and use | Coarse; cornbread, coatings | Fine; breading, blends | Dough; tortillas, tamales | Thickener |
The USDA numbers show the practical gap: whole-grain cornmeal and whole-grain corn flour are nearly identical in fiber, while cornstarch keeps almost none of the fiber, protein or minerals of the kernel. Masa flour lists far more calcium than plain corn products in USDA data, consistent with the calcium hydroxide used to make it. Since 2016, FDA rules (21 CFR 172.345) have allowed folic acid to be added to corn masa flour, so check the label to see whether a brand is enriched.
Is cornmeal gluten-free?
Corn itself is naturally gluten-free, and the Celiac Disease Foundation lists corn among naturally gluten-free foods. Two catches matter for anyone with celiac disease or a wheat allergy. Some self-rising cornmeal mixes contain wheat flour; USDA even has an entry for self-rising cornmeal “with wheat flour added.” And grains can pick up gluten through cross-contact during harvesting and milling. A “gluten-free” label means the food meets FDA’s standard of less than 20 parts per million of gluten. Wheat is one of the nine major food allergens that must be declared on US labels; corn is not.
Food-safety and label notes
- Mold toxins: corn can carry fumonisins, toxins made by molds in the field. FDA has issued guidance levels for fumonisins in corn meal, corn flour and grits, with a lower level for degermed products than whole or partially degermed ones. Store cornmeal dry and discard any bag that smells musty or shows mold.
- Nixtamalization and toxins: a 2019 review in Toxins found many studies showing lower mycotoxin levels in alkali-cooked corn, mostly aflatoxins and fumonisins, though some reduction may reverse under acidic conditions.
- Read the ingredient list: cornbread and muffin mixes often add sugar, salt and leavening; self-rising cornmeal includes leavening and salt.
- Corn sweeteners are different foods: corn syrup and high fructose corn syrup are refined sweeteners made from cornstarch, not whole-grain corn.
How cornmeal fits a balanced diet
Cornmeal is an energy-dense carbohydrate, so portion and preparation shape what it adds to a meal. Whole-grain cornmeal counts toward whole grains and brings fiber and magnesium; enriched degermed cornmeal brings added B vitamins and iron but less fiber. Pairing corn dishes with beans, vegetables or eggs adds protein and fiber. For other whole grains, see our oats and sorghum guides, and our fiber per day guide covers official intake references. For another starch that behaves very differently, read our tapioca guide.
Frequently Asked Questions
What is cornmeal made of?
Cornmeal is dried corn ground into a coarse flour. Whole-grain cornmeal keeps the bran and germ; degermed cornmeal has them removed and is often enriched.
Is cornmeal healthy?
It depends on the type. USDA data show whole-grain cornmeal is a good source of fiber and magnesium, while enriched degermed cornmeal has less fiber but added B vitamins and iron.
What is the difference between cornmeal vs corn flour?
Both are ground dried corn. Corn flour is ground fine and smooth; cornmeal is coarser. In UK recipes, corn flour usually means cornstarch.
Can I use cornmeal instead of masa harina?
Not for tortillas or tamales. Masa harina comes from corn cooked in an alkaline solution, which lets it form a dough; plain cornmeal does not bind the same way.
Is yellow cornmeal different from white?
Nutrient values are almost the same in USDA data, except yellow cornmeal contains lutein, zeaxanthin and a little vitamin A that white cornmeal lacks.
Is cornmeal gluten-free?
Corn is naturally gluten-free, but some self-rising mixes contain wheat and cross-contact can occur. People with celiac disease should look for a certified gluten-free label.
Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: Tapioca: Pearls, Starch, Nutrition and Is It Healthy?, Grits: Nutrition Facts, Are Grits Healthy, and Grits vs Oatmeal, Polenta: Nutrition, Whole-Grain Choices and Polenta vs Grits, Corn: Nutrition Facts, Sweet Corn vs Popcorn, Is Corn Healthy?.