Brown Rice: Nutrients, What Research Shows and Safety

Brown rice is rice (Oryza sativa, family Poaceae) with only the inedible hull removed, so the bran and germ stay on the grain. White rice is the same grain after milling has taken the bran and germ off. [3] People eat brown rice for its fiber and minerals and because it counts as a whole grain. [16] This page is about brown rice as a food. It keeps that apart from rice bran oil, rice milk and extracts, which the studies below did not test.

Read this first

• Arsenic is the main food-safety question. Rice takes up more arsenic from soil and water than wheat or barley, and arsenic collects in the bran, so brown rice has more inorganic arsenic than white rice. [2] [3] The FDA has set a 100 parts per billion action level for inorganic arsenic in infant rice cereal. [2]
• Young children: the NHS says children under 5 should not have rice drinks instead of breast milk, formula or cow's milk because of arsenic, but that rice itself does not need to be avoided. [9]
• Evidence in one line: large observational studies link more brown rice with a lower chance of type 2 diabetes, but trials that swap brown for white rice show little change in blood sugar. [4] [5]
• Leftover cooked rice: the NHS advises refrigerating it within 1 hour, eating it within 24 hours and reheating it only once. [10]
• Rice is naturally gluten-free, but products can pick up gluten from other grains during processing. [15]

What is in it (USDA values)

Values are for brown, long-grain rice, cooked (USDA FoodData Central item 169704, SR Legacy). [1] The serving column is the USDA household portion of 1 cup cooked, 202 g. [1] Dry (raw) rice, item 169703, has about 367 kcal per 100 g because it holds no cooking water; do not compare dry and cooked numbers directly. [1]

% Daily Value uses the FDA 2016 Daily Values; values vary with variety, growing place and cooking. The serving figures are the 100 g values multiplied by 2.02. Brown rice is not a notable source of omega-3: USDA lists about 0.02 g of ALA per cup. [1]

Plant compounds: the sources we read do not describe specific plant compounds in brown rice that were shown to act in people, so we do not list any. A review of germinated brown rice (a processed form, not ordinary cooked brown rice) discusses polyphenols, GABA and gamma-oryzanol, with much of the support from lab and animal work. [13]

What research says

Eaten as food vs other forms. All of the above is about cooked rice as a food. Rice bran oil, rice milk, rice protein powders and germinated rice extracts are different products. Cohort studies cannot show cause, and we did not check who funded each study. The Cochrane review noted that some of its trials were funded by organizations with commercial interests in cereals. [7]

How much is a normal serving

MedlinePlus (reviewed February 2026) says most children and adults should eat about 2 to 4 servings of whole grains a day, and gives 1/2 cup (85 g) of cooked brown rice as one serving. [11] The USDA household portion is 1 cup cooked (202 g), which is about 248 kcal. [1] This is information, not a prescription. The NHS says starchy foods should make up just over a third of the food we eat, and that brown and wholegrain rice contain fiber and B vitamins. [10]

Safety, allergy and medicines

• Arsenic. The FDA says rice and rice products have more inorganic arsenic than other foods it tested, and that early-life exposure is linked to possible effects on brain development and a higher lifetime cancer risk. [2] In FDA modeling, infant cereal made from brown rice averaged 119.0 ppb inorganic arsenic versus 103.9 ppb for white-rice cereal. [2] A 2023 review, citing an FDA assessment, gave averages of 154 ppb for brown and 92 ppb for white rice. [3] A modeling study estimated that replacing white with brown rice adds a small cancer risk, mainly where people eat a lot of rice. [12]
• Cooking in extra water (like pasta, then draining) cut inorganic arsenic in brown rice by about 50% in a lab study. [8] Rinsing alone had little effect. [8] Enriched white rice loses added vitamins this way, but brown rice, which is not enriched, lost much less. [8]
• Babies and young children. The FDA's 100 ppb action level applies to infant rice cereal. [2] The NHS says not to give rice drinks to children under 5 in place of milk. [9] See the arsenic in rice guide.
• Gluten and celiac disease. Rice is not wheat, rye or barley. The FDA lets inherently gluten-free grains such as rice carry a "gluten-free" label if cross-contact gluten stays under 20 ppm. [15] If you have celiac disease, check the label. See gluten, celiac disease and sensitivity basics.
• Cooked rice storage. The NHS gives these steps for cooked rice: refrigerate within 1 hour, eat within 24 hours and reheat only once. [10] The page we read does not explain why; the steps are a standard food-safety precaution for leftover rice.
• Mold and mycotoxins. WHO lists rice among the cereals that aflatoxin-producing molds can contaminate, and says to discard grain that looks moldy or discolored and to store it dry. [14]
• Phytates. Whole grains contain phytate, which can reduce mineral absorption in the same meal. We found no brown-rice-specific trial. In bread studies, higher phytate lowered iron bioaccessibility in the lab, while long-term human trials were inconclusive. [17] See phytates and lectins in whole grains.
• Allergy. Rice is not on the FDA list of nine major allergens (milk, eggs, fish, shellfish, tree nuts, peanuts, wheat, soybeans, sesame). [18] For trouble breathing, or swelling of the face, lips or throat, call 911 or your local emergency number. [19]
• Medicines, pregnancy, kidney disease, diabetes. We did not find a source that describes a direct interaction between brown rice and a specific medicine, so none is claimed. For people on blood-sugar medicines, brown rice still contains carbohydrate (about 52 g per cup cooked [1]). People with kidney disease are sometimes asked to watch phosphorus and potassium; USDA lists 208 mg and 174 mg per cup [1], and a clinician or dietitian should set limits. See foods and kidney disease and foods in pregnancy.
• Fiber. Large jumps in fiber can cause gas and bloating; see fiber side effects. The NHS says fiber intake should rise toward 30 g a day. [20]

Choosing, storing and food safety

• "Brown" on a package is not proof of whole grain for every product. The Harvard Nutrition Source notes that whole-grain labels are inconsistent and suggests checking that a whole grain is listed first or second in the ingredients. [16] See fiber and whole-grain claims on packages.
• Buy grain fresh, store it dry and cool, and throw out grain that looks moldy. [14]
• We did not read a source on how long dry brown rice keeps before the oils in the germ turn rancid, so we give no number.

Related pages

• Arsenic in rice and rice products
• Wild rice
• Whole grains and ancient grains
• Foods for blood sugar control
• Heavy metals and contaminants in foods
• Foods and medicine interactions