Brown rice is the whole grain: only the inedible hull is removed, so the bran and germ stay on. White rice is the same grain with the hull, bran and germ milled away. That bran layer is where the extra fiber, magnesium and manganese sit, and a quarter cup of dry brown rice (48 g) gives 77% of the daily value for manganese.
The bran also holds oils, which is why brown rice spoils faster than white rice, and it holds arsenic. Rice takes up more arsenic than other grains tested, and in FDA tests the average inorganic arsenic was 154 parts per billion in brown rice against 92 in white rice. Lab imaging found the arsenic concentrated in the outer layers of brown rice, which milling removes.
Does the swap to brown rice pay off? Pooled trials found about 1.6 kg less body weight than with white rice, a smaller blood sugar rise after a meal, and no clear change in HbA1c, fasting blood sugar or LDL cholesterol. Large cohorts link brown rice to a lower risk of type 2 diabetes, but they cannot prove cause. In lab tests, cooking brown rice in extra water and draining it cut inorganic arsenic by about half.
Health benefits of brown rice
The top findings from 30 studies, strongest evidence first
What the stars mean
- Strong. Several randomized trials, pooled in a meta-analysis, point the same way, or regulators (FDA or EFSA) have approved the claim.
- Moderate. Good randomized trials support it, but there are fewer of them, or their results vary.
- Limited. Small, short or single trials, or mixed results. Promising, but it needs confirmation.
Population and lab studies get no stars: they show a link or a mechanism, not proof.
How we rate evidence →- ★★Slightly lower body weight than with white riceAcross 13 trials, brown rice instead of white lowered body weight by 1.63 kg. It did not change cholesterol or blood sugar markers, and certainty was low or very low.
- ★★Smaller blood sugar rise after a mealIn pooled trials, a meal of intact whole-grain rice gave a smaller blood sugar rise than white rice (40.5 mmol/L per minute lower). This is a short-term, after-meal result.
- ★★No clear lower HbA1c or fasting blood sugarAcross 7 trials in adults with prediabetes or type 2 diabetes, brown rice did not lower HbA1c or fasting blood sugar versus white rice. HbA1c is average blood sugar, and short trials may miss an effect.
- ★★Slightly higher “good” HDL cholesterolIn 11 trials, swapping white rice for brown raised “good” HDL cholesterol only a little (by 0.06 mmol/L) and changed no other risk factor. Most trials had some concern for risk of bias.
- ★Better blood vessel function in type 2 diabetesIn 28 adults with type 2 diabetes, 8 weeks of brown rice improved blood vessel function by 20.4%, against a 5.8% decline on white rice. HbA1c and cholesterol did not differ between the diets.
All 30 studies, strongest evidence first
In 11 trials, swapping white rice for brown raised HDL cholesterol by only 0.06 mmol/L and changed no other risk factor
Systematic review of 8 cohort studies and 11 randomized trials (1034 people) that lasted at least 2 weeks. HDL rose 0.06 mmol/L on brown rice, no other risk factor differed, and most trials had some concern for risk of bias. The cohort part linked brown rice to a lower risk of type 2 diabetes (relative risk 0.89). Two authors report involvement in the production and distribution of brown rice.
In 13 trials, brown rice instead of white lowered body weight by 1.63 kg but did not change cholesterol or blood sugar markers
Meta-analysis of 13 randomized trials in adults. Brown rice also lowered BMI by 0.58 kg/m² and waist size by 2.56 cm. Results differed a lot between trials, and the authors graded the certainty of the evidence low or very low. Pre-germinated brown rice, a processed form, looked stronger (see the germinated brown rice trials below).
In prediabetes and type 2 diabetes, brown rice did not lower HbA1c or fasting blood sugar compared with white rice
Meta-analysis of 7 trials in 417 adults. Brown rice did lower body weight by 2.2 kg and raised HDL cholesterol a little, but not LDL, waist size or blood pressure. The authors rate the evidence low to moderate and note that short trials may miss a blood sugar effect.
A meal of whole-grain rice gave a smaller blood sugar rise than white rice in pooled trials
Meta-analysis of randomized trials (20 publications, 14 rice comparisons) that measured blood sugar after a single meal. The area under the glucose curve was 40.5 mmol/L per minute lower after intact whole-grain rice (95% CI 21.3 to 59.6 lower). Results for wheat and rye were not significant. This is a short-term, after-meal result.
Brown rice instead of white for 3 months did not change blood sugar, insulin or cholesterol overall in 166 overweight adults in India
Crossover trial in Chennai: 166 overweight adults ate parboiled brown or white rice in two meals a day, 6 days a week. Benefits showed up only in subgroups, such as people with metabolic syndrome (HbA1c fell 0.18% in them and rose 0.05% in people without it), which are weaker findings. The rise in the inflammation marker hs-CRP was smaller on brown rice (0.03 against 0.63 mg/L).
Brown rice for 6 weeks lowered weight, waist size and an inflammation marker compared with white rice in overweight women
Crossover trial in 40 overweight or obese women before menopause (35 finished) who ate 150 g of cooked brown or white rice a day for 6 weeks each. Brown rice also lowered BMI, hip size and diastolic blood pressure, while blood fats and fasting glucose did not differ. The abstract gives no figures, and the trial was small.
Eight weeks of brown rice improved blood vessel function by 20.4%, against a 5.8% decline on white rice, in type 2 diabetes
Randomized trial in 28 adults with type 2 diabetes in Japan (14 per group). HbA1c did not change and cholesterol did not differ between the diets. Blood sugar after a 250 kcal test portion of rice was slightly but consistently lower with brown rice. The trial was small.
Five days of brown rice meals lowered the daily blood sugar rise by 19.8% compared with white rice
Crossover trial in 15 overweight adults without diabetes in India, with continuous glucose monitors. The five-day change in fasting insulin was 57% lower on brown rice. It was very small and short, and meals were eaten freely rather than matched for calories.
One brown rice meal cut the blood sugar response by 35% in 9 people with type 2 diabetes, against milled rice
Randomized crossover test of brown and milled rice from the same batch and variety in 10 healthy people and 9 with type 2 diabetes. In healthy people the glycemic area was 19.8% lower and the glycemic index 12.1% lower. A lab test also found 23.7% less sugar released from brown rice. These were single meals.
Brown rice left the stomach more slowly than white rice in 10 healthy adults
Crossover trial of 6 cooked rice samples, each with 50 g of available carbohydrate, using a breath test. Brown rice delayed stomach emptying whether it was low or high in amylose (p < 0.05). The authors link this to the bran layer and say it partly explains the lower blood sugar response to brown rice. Single meals in a small group.
People absorbed about the same iron from brown rice as from milled rice, despite brown rice holding more
Radioisotope study in 12 healthy adults using one rice variety. Brown rice had 1.1 mg of iron per 100 g against 0.6 mg for milled rice, but also 290.1 mg of phytic acid against 84.0 mg, and people absorbed 0.13 mg from brown rice and 0.14 mg from milled rice. Absorption from a full meal was higher for both (0.36 and 0.35 mg), which the authors tie to iron enhancers such as fish, vegetables and citrus fruit.
Germinated brown rice, a processed form, raised HDL cholesterol from 1.11 to 1.44 mmol/L in older adults over 3 months
Randomized trial in Vietnam: 80 adults ate 200 g a day of cooked pre-germinated brown rice, while the comparison group kept eating white rice as usual. Fewer people in the rice group had metabolic syndrome at the end (p < 0.05). Germinated rice is a processed form, so this does not show what plain brown rice does.
Germinated brown rice, a processed form, lowered fasting blood sugar in type 2 diabetes, but HbA1c did not fall significantly
Randomized trial in 99 people with type 2 diabetes who replaced 100 g of white rice a day with germinated brown rice for 12 weeks or kept their usual diet. Fasting glucose fell, with an effective rate of 62%, and short-chain fatty acids rose. The control group kept eating as usual, and plain brown rice was not tested.
Germinated brown rice, a processed form, lowered fasting glucose and HbA1c in type 2 diabetes compared with a usual diet
Randomized trial that enrolled 220 people with type 2 diabetes and randomized 112, of whom 85 finished (42 rice, 43 control). The rice group ate 100 g a day of germinated brown rice instead of refined grain for 3 months. Total cholesterol and HDL were also lower than in the control group. The control group kept eating as usual, and plain brown rice was not tested.
Eating 2 or more servings of brown rice a week went with a lower risk of type 2 diabetes (relative risk 0.89) in three large US cohorts
Health Professionals Follow-up Study and Nurses’ Health Study I and II, with 39,765 men and 157,463 women. High white rice intake (5 or more servings a week against less than 1 a month) had a relative risk of 1.17. Replacing 50 g a day of cooked white rice with brown rice went with a 16% lower risk (95% CI 9 to 21%). Diet was self-reported, so other habits of brown rice eaters may play a part.
Eating brown rice 2 or more times a week went with a lower rate of type 2 diabetes (hazard ratio 0.88)
Pooled analysis of the same three US cohorts as the study above, updated, looking at whole grain foods one by one. Brown rice at 2 or more servings a week against less than 1 a month had a hazard ratio of 0.88 (95% CI 0.82 to 0.94), while oatmeal had 0.79. Total whole grains went with a 29% lower rate. Diet was self-reported.
Eating brown rice 5 or more times a week showed no link to heart disease or stroke in three US cohorts (hazard ratio 1.01)
Pooled analysis of 207,556 people followed for 4,393,130 person-years, with 12,391 cases of cardiovascular disease. The hazard ratio for 5 or more servings a week against less than 1 was 1.01 (95% CI 0.79 to 1.28) for brown rice and 0.98 for white rice. Diet was self-reported.
In 437 Japanese factory workers, high white rice intake went with weight gain of 3 kg or more in a year, but high brown or multigrain rice intake did not
One-year cohort using routine check-up data. Brown rice and multigrain rice were grouped together, so it does not isolate brown rice. After adjustment, high white rice intake was linked to gaining 3 kg or more (p = 0.034), while high brown or multigrain rice intake was not (p = 0.387).
At 12 months, babies who ate infant rice cereal had urinary arsenic of 9.53 µg/L, against 2.85 µg/L in babies who ate no rice
New Hampshire birth cohort with diet data on 759 infants; babies who ate fish or seafood were left out of this comparison. Rice snacks went with 4.97 µg/L. Tested infant rice snacks held 5 to 201 ng/g of inorganic arsenic. The study covers rice products in general, not brown rice in particular, and urine arsenic shows recent exposure, not illness.
In pregnant women, eating 0.56 cup of cooked rice a day was comparable to drinking 1 L of water with 10 µg/L of arsenic, judged by urinary arsenic
Study of 229 pregnant women with 3-day diet records and urine tests; 73 reported eating rice, a median of 28.3 g a day. Rice intake and arsenic in tap water each tracked with urinary arsenic. 10 µg/L is the US limit for drinking water. Rice types were not separated, and urinary arsenic is a short-term marker.
Each extra 0.25 cup of cooked rice went with 14.2% higher urinary arsenic in US children
National survey data (NHANES, 2003 to 2008) on 2,323 children aged 6 to 17, with rice eaten in the past 24 hours and children who ate seafood left out. Median urinary arsenic was 8.9 µg/L in children who ate rice and 5.5 µg/L in those who did not. Rice types were not separated, and urine arsenic reflects recent intake.
Pooled whole grains, not brown rice alone: each 90 g a day went with lower cardiovascular risk (relative risk 0.78)
Meta-analysis of 45 prospective studies of whole grain foods in general. Whole grain intake also went with lower all-cause mortality (relative risk 0.83). Whole grain bread, breakfast cereal and added bran were linked to lower risk, but there was little evidence of a link for refined grains, white rice or total rice. Brown rice was not analyzed on its own.
Pooled fiber and whole grain intake, not brown rice alone, went with 15 to 30% lower risk of death and heart disease
Series of reviews of 185 prospective studies and 58 clinical trials (4635 adults). The authors rated the certainty of evidence as moderate for fiber and low to moderate for whole grains, with the largest benefit at 25 to 29 g of fiber a day. Rice was not analyzed separately. Funded by public bodies including the WHO.
Arsenic sits in the outer layers of brown rice, and brown rice had a higher share of inorganic arsenic than white rice
Lab imaging and chemical tests of white and brown rice from the United States, China and Bangladesh. A wider survey of 39 white and 45 brown rice samples found brown rice held a higher proportion of the more toxic inorganic form. It measures arsenic in grains, not in people.
Rice bran, the layer brown rice keeps, held 10 to 20 times more inorganic arsenic than bulk grain
Lab tests of commercial and lab-milled rice bran and five rice bran solubles products from the United States and Japan (0.61 to 1.9 mg/kg of inorganic arsenic). Rice bran products are not the same as cooked brown rice. The authors also note that whole grain rice already has more arsenic than polished rice.
Cooking brown rice in extra water cut inorganic arsenic by about 50%
Lab study of several rice types, rinsed or unrinsed, cooked in different amounts of water. Excess water cut inorganic arsenic by 40% in long-grain white and 60% in parboiled rice, while rinsing alone had little effect. Enriched white and parboiled rice lost 50 to 70% of their added iron, folate, niacin and thiamin, and brown rice lost significantly less.
Cooking rice with 6 parts water to 1 removed 45% of inorganic arsenic, while 2.5 parts water removed none
Lab tests of basmati, long-grain, polished and whole-grain rice cooked in several ways. The 45% figure (and 35% for total arsenic) was measured in long-grain and basmati rice, and parboiled rice was not tested in the high-water run. Rinsing removed about 10% in basmati and was less effective in other types, and steaming did not work consistently.
Cooking rice with 12 parts water to 1 removed 57% of inorganic arsenic on average
Lab study of 6 whole-grain and 6 polished rice samples. A percolating method that keeps hot water flowing through the rice removed up to 85% from individual rice types, and about 69% on average from whole-grain rice in the laboratory setup. A coffee percolator at home removed 49%, with no difference between whole-grain and polished rice.
Cooking in excess water or by a parboil-then-absorb method removed 54 to 58% of inorganic arsenic from white and brown rice
Lab study of white, parboiled and brown rice cooked in arsenic-safe and arsenic-spiked tap water. Cooking with arsenic-spiked water added arsenic to every rice type, so the cooking water matters. Cooked brown rice was richer than other types in many essential minerals, and cooking methods changed how much potassium, iron, copper and molybdenum was lost.
In rats, brown rice gave more usable zinc per gram than milled rice (21 against 15 µg), even though its phytate lowered absorption
Rats were fed cooked milled, undermilled or brown Philippine rice. Zinc absorption was about 92% of zinc sulfate for milled rice, 86% for undermilled and 77% for brown rice, but brown rice held more zinc (27.2 against 16.5 µg/g). This is an animal study.
Who should be careful with brown rice
Most people can eat brown rice freely. Take a little care if one of these applies:
- Babies and toddlers. Rice products add arsenic, and in the FDA’s final 2020 guidance the action level for inorganic arsenic in infant rice cereal is 100 µg/kg (100 parts per billion). The FDA says iron-fortified oat, barley or multigrain cereals are also suitable first cereals, and the NHS advises that children under 5 should not have rice drinks in place of breast milk, formula or cows’ milk.
- Eating rice every day. The FDA’s risk assessment found that cancer risk from rice rose almost in step with daily servings, and the average inorganic arsenic in brown rice is higher than in white rice. EU law has capped inorganic arsenic at 0.25 mg/kg for husked (brown) rice and 0.15 mg/kg for white rice since 2023. The concern is small for a few servings a week: a 2025 risk analysis found no acute risk for the general US population, but higher estimated exposure in people who eat brown rice regularly, and the most in young children. Vary your grains and cook rice in extra water.
How to choose, store and eat brown rice
- Plain brown rice: the form in most studies above, such as 150 g of cooked rice a day for 6 weeks. It takes longer to cook than white rice, and a cohort linked swapping 50 g a day of cooked white rice for brown rice to a 16% lower risk of type 2 diabetes.
- Cooked in extra water: boiling it in plenty of water and draining it, like pasta, cut inorganic arsenic by about 50% in brown rice, and 54 to 58% in another test. Brown rice lost less of its nutrients to the water than enriched white rice did.
- Germinated (sprouted) brown rice: a processed form with its own trials of 100 to 200 g a day for 12 weeks to 3 months. In the pooled review it lowered weight by 1.75 kg, but no study here compares it directly with plain brown rice.
Choose dry, whole grains from a bag with a recent date and keep them airtight. Brown rice spoils faster than white rice because its bran holds oils, and a study found that storage at 15 or 20 °C slowed that fat breakdown compared with warmer storage, so keep it somewhere cool. Residues are no reason to skip it: in USDA tests of 189 rice samples in 2018, only one had a residue above the legal limit.
Sources
- FDA issues final guidance for industry on action level for inorganic arsenic in infant rice cereals. U.S. Food and Drug Administration. 2020.
- Arsenic in rice and rice products risk assessment report. U.S. Food and Drug Administration. Revised March 2016.
- Foods to avoid giving babies and young children. NHS.
- Commission Regulation (EU) 2023/465 amending Regulation (EC) No 1881/2006 as regards maximum levels of arsenic in certain foods. Official Journal of the European Union. 2023.
- Scott CK, Wu F. Arsenic content and exposure in brown rice compared to white rice in the United States. Risk Anal. 2025.
- Gray PJ, Conklin SD, Todorov TI, Kasko SM. Cooking rice in excess water reduces both arsenic and enriched vitamins in the cooked grain. Food Addit Contam Part A Chem Anal Control Expo Risk Assess. 2016.
- Menon M, Nicholls A, Smalley A, Rhodes E. A comparison of the effects of two cooking methods on arsenic species and nutrient elements in rice. Sci Total Environ. 2024.
- Qu L, Zhao Y, Li Y, Lv H. Effect of storage temperature on the quality of brown rice revealed by integrated GC-MS and lipidomics analysis. Food Chem. 2025.
- Pesticide Data Program annual summary, calendar year 2018. USDA Agricultural Marketing Service.
- Brown rice. Wikipedia.
History of brown rice
Asian rice was domesticated in China, by most estimates some 13,500 to 8,200 years ago. A 2023 study of 1,578 rice genomes found a more complex story: about 80% of the selected domestication alleles came from wild rice in China, and about 20% came from wild rice in South and Southeast Asia.
Rice then spread with farmers. It reached Korea and Japan between about 5,500 and 3,200 years ago and India about 4,500 years ago, and it crossed to the Americas after 1492. Africa has its own rice, Oryza glaberrima, domesticated in West Africa about 3,000 years ago.
Brown rice is simply rice with the hull taken off. Milling away the bran and germ makes white rice, and that choice cost lives. In 1882 the Japanese naval doctor Takaki Kanehiro noticed that beriberi struck low-ranking sailors who ate mostly rice. On a training voyage that year there were 169 cases and 25 deaths among 376 men, while a later voyage with a more varied diet had 14 cases and no deaths, and the navy adopted that diet in 1887.
The cause was found in the rice itself. In Java, Christiaan Eijkman saw chickens fed polished army rice develop a disease like beriberi, and they recovered when they were fed rice with its silver layer. He published the work in 1897, his assistant Gerrit Grijns described beriberi as a deficiency disease in 1901, and Eijkman won the 1929 Nobel Prize in Physiology or Medicine for the discovery of the antineuritic vitamin, now known as thiamin or vitamin B1.
Sources
- Rice. Wikipedia.
- Brown rice. Wikipedia.
- Beriberi. Wikipedia.
- Jing CY, Zhang FM, Wang XH, et al. Multiple domestications of Asian rice. Nat Plants. 2023.
- Pietrzak K. Christiaan Eijkman (1856–1930). J Neurol. 2019.
- Christiaan Eijkman: facts. The Nobel Prize in Physiology or Medicine 1929. NobelPrize.org.
Frequently asked questions about brown rice
Is brown rice healthier than white rice?
In some ways, but the trials are mixed. Dry brown rice has 1.6 g of fiber and 77% of the daily value for manganese in a quarter cup (48 g), and pooled trials found 1.63 kg less body weight than with white rice. LDL cholesterol and blood sugar markers did not change, the certainty of that evidence was low, and brown rice also holds more inorganic arsenic (154 against 92 parts per billion in FDA tests).
Is brown rice good for diabetes?
It lowers the blood sugar rise after a meal, but long-term markers did not improve in trials. Pooled trials found a smaller blood sugar rise after whole-grain rice than white rice, yet a review of 7 trials in prediabetes and type 2 diabetes found no change in HbA1c or fasting glucose. Cohorts link brown rice to a lower diabetes risk (relative risk 0.89), and the glycemic index is about 68 (an estimate). Check portions and choices with your care team.
Is brown rice good for weight loss?
It may help a little, but the evidence is weak. Pooled trials found 1.63 kg less weight and a waist 2.56 cm smaller than with white rice, yet results differed a lot between trials and the certainty was low or very low. Brown rice still has 172 calories in a quarter cup of dry rice (362 per 100 g), so portions matter. A Japanese cohort of 437 workers linked high white rice intake, but not brown or multigrain rice, to gaining 3 kg in a year.
Does brown rice contain arsenic?
Yes, and on average more than white rice. In FDA tests the average inorganic arsenic was 154 parts per billion in brown rice and 92 in white rice, because arsenic collects in the outer layers that milling removes. FDA still found that most of the rice-related cancer risk in the US comes from white rice, because far more of it is eaten. EU law allows 0.25 mg/kg in husked (brown) rice and 0.15 mg/kg in white rice.
How can you reduce arsenic in brown rice?
Cook it in plenty of water and drain it. This cut inorganic arsenic by about 50% in brown rice in one test and by 54 to 58% in another, while 2.5 parts water to 1 part rice removed none and rinsing alone had little effect. Brown rice lost less of its nutrients to the water than enriched white rice did. Varying your grains also lowers the total.
Is brown rice safe for babies and toddlers?
In small amounts it is common, but variety matters. Babies who ate infant rice cereal had urinary arsenic of 9.53 µg/L against 2.85 µg/L for babies who ate no rice, and the FDA set an action level of 100 parts per billion of inorganic arsenic for infant rice cereal. The FDA says oat, barley and multigrain cereals are also suitable first cereals, and the NHS advises against rice drinks for children under 5. Ask your pediatrician about your child.
How much brown rice can you eat a day?
No study here sets an ideal amount. Trials used 150 g of cooked rice a day for 6 weeks, or two meals a day, 6 days a week, for 3 months. In US cohorts, 2 or more servings a week went with a lower diabetes risk and no change in heart disease risk. Because arsenic exposure rises with servings, many people do well rotating rice with other grains.
Is germinated brown rice better than regular brown rice?
It may be, but no study here compares them directly. In the pooled review, pre-germinated brown rice lowered weight by 1.75 kg, total cholesterol by 24.22 mg/dL and fasting glucose by 15.83 mg/dL against white rice, but the trials differed a lot and the certainty was low or very low. Germinated rice is a processed form, and the trials were small.