Brown rice and wild rice: what each grain carries and what trials found

A network meta-analysis of 55 trials with 3900 people found brown rice ineffective at improving blood lipids compared with control, while oat bran lowered LDL cholesterol by 12 mg/dL (-17 to -7.3; metric: 0.32 mmol/L, -0.44 to -0.19). The brown rice arm inside that network was small, and wild rice was not studied at all. Per 100 g boiled, UK data give wild rice 5.3 g protein and 2.5 g fiber against 3.6 g and 1.5 g for brown rice, at 145 calories against 132. Brown rice holds more magnesium, 48 mg against 43, and twice the manganese, 0.92 mg against 0.46. A cooked cup of brown rice weighs 6.9 oz (195 g) in US survey data and a cup of wild rice 164 g, so comparisons per cup shift toward brown rice. Eight US samples of dry wild rice ranged from 4.3 to 7.0 mg zinc per 3.5 oz (100 g).

How much is actually in it

• Boiled wild rice has more protein and fiber than boiled brown rice per 3.5 oz (100 g), 5.3 g against 3.6 g protein. — UK composition data: wholegrain brown rice and wild rice, each boiled in unsalted water (CoFID 11-869 and 11-873) Evidence E source
  Brown: 132 calories, 3.6 g protein, 1.5 g AOAC fiber, 48 mg magnesium, 0.92 mg manganese; wild: 145 calories, 5.3 g protein, 2.5 g fiber, 43 mg magnesium, 0.46 mg manganese per 3.5 oz (100 g)
• Eight US samples of dry wild rice held 12.8 g protein and 5.8 mg zinc per 3.5 oz (100 g), with zinc ranging from 4.3 to 7.0 mg. — eight samples of dry raw wild rice analyzed for USDA Foundation Foods (n = 8) Evidence E source
  Protein 12.8 g (12.0-14.25); zinc 5.85 mg (4.33-6.96); fiber 4.26 g (3.56-4.98); magnesium 108.5 mg (98.2-118.0) per 3.5 oz (100 g) dry

What a real portion looks like

• A cup of cooked brown rice weighs 6.9 oz (195 g) in US survey data, a cup of cooked wild rice 164 g. — USDA FNDDS portion weights, cooked without added fat (codes 56205018 and 56205210) Evidence E source
  1 cup cooked: brown rice 195 g, wild rice 164 g; quantity not specified: 147 g and 123 g

What your body absorbs

• Brown rice gives a lower blood sugar rise than white rice at equal cooking time, but the gap shrinks with its usual longer cooking. — original studies of glycemic response to rice, searched to July 2014 Evidence C source
  Glycemic index of rice varieties 48 to 93; brown below white at identical cooking time, small and inconsistent difference at longer cooking
• In a crossover RCT, brown rice had a 12.1% lower glycemic index than milled rice in healthy people and 35.6% lower in type 2 diabetes. — 10 healthy and 9 type 2 diabetic volunteers, same batch and variety of rice (n = 19) Evidence B source
  Glycemic index 12.1% lower in healthy and 35.6% lower in diabetic subjects (p < 0.05); in vitro sugar release 23.7% lower

What cooking and storage change

• USDA factors for cooked and drained brown rice keep 60% of folate and 75% of thiamin, but 95% of magnesium and zinc. — USDA retention factors for rice, white or brown, cooked and drained (group Cereal Grains and Pasta) Evidence E source
  Folate 60%, thiamin 75%, potassium 85%, iron 90%, magnesium 95%, zinc 95%, niacin 95% retained

What it does to your health

• A network meta-analysis of 55 trials with 3900 people found brown rice did not improve blood lipids, while oat bran cut LDL by 12 mg/dL (0.32 mmol/L). — 55 trials, 3900 participants (n = 3900) Evidence A source
  Brown rice ineffective vs control for TC, LDL-C, HDL-C and TG; oat bran LDL-C -12 mg/dL (-17 to -7.3; metric: -0.32 mmol/L, -0.44 to -0.19)
• Three US cohorts of 207,556 people found no link between eating brown rice 5 or more times a week and heart disease. — 207,556 women and men in NHS, NHS II and HPFS, 4.39 million person-years (n = 207556) Evidence C source
  CVD HR 1.01 (0.79-1.28) for brown rice, 0.98 (0.84-1.14) for white rice, >=5 vs <1 serving/wk

What people believe that the data does not support

• The EU refused the claim that germinated brown rice (Vibigaba) helps maintain normal blood pressure. — EU Register on nutrition and health claims Evidence E source
  Status non-authorized; two further Vibigaba claims (weight, blood glucose) also non-authorized

Who this works differently for

• An RCT asked 112 people with type 2 diabetes to eat 3.5 oz (100 g) a day of germinated brown rice instead of refined grain for 3 months. — 112 type 2 diabetes patients randomized, 85 completed, 3 months (n = 112) Evidence B source
  FBG, HbA1c, TC lower than control; n-3 PUFA higher; sizes not given in abstract

What is still unknown

• Cohort data tie brown rice to lower type 2 diabetes risk, but the estimate rests on few studies. — 16 cohort studies of grain intake and type 2 diabetes (n = 16 studies) Evidence C source
  Whole grains RR 0.68 (0.58-0.81) per 3 servings/day; brown rice inverse association from few studies

The bottom line

Brown rice raises blood sugar less than white rice when both are cooked for the same time. A systematic review found that at the longer cooking times brown rice usually gets, the difference turns small and inconsistent. In one crossover test of 10 healthy and 9 diabetic volunteers eating a single rice variety, brown rice had a 12.1% lower glycemic index than milled rice in the healthy group and 35.6% lower in people with type 2 diabetes. Those were single test meals, and they say nothing about long-term control. USDA factors for rice boiled and drained keep 60% of folate, 75% of thiamin and 95% of magnesium and zinc, from a 1975 table that does not cover wild rice. Across three US cohorts of 207,556 people, eating brown rice 5 or more times a week showed no link with heart disease (HR 1.01, 95% CI 0.79 to 1.28), and few people ate it that often. A meta-analysis of 16 cohorts linked brown rice with lower type 2 diabetes risk, based on few studies and without a pooled number for brown rice alone. The EU refused the claim that germinated brown rice sold as Vibigaba helps maintain normal blood pressure. The refusal means the evidence fell short when it was assessed. It does not show the product has no effect. We hold no card on arsenic, safety limits, allergy, pregnancy or medicines for either grain, so this page has no caution section.

Sources

1. bwr-r6-01 · CoFID 2021, dataset
   CoFID 11-869 Rice, brown, wholegrain, boiled in unsalted water: Energy 132 kcal, Protein 3.6 g, AOAC fibre 1.5 g, Water 67.0 g, Magnesium 48 mg, Manganese 0.92 mg; CoFID 11-873 Rice, wild, boiled in unsalted water: Energy 145 kcal, Protein 5.3 g, AOAC fibre 2.5 g, Water 66.7 g, Magnesium 43 mg, Manganese 0.46 mg
   CoFID 2021 (Public Health England), codes 11-869 and 11-873 · checked 2026-09-29
2. bwr-r6-02 · USDA Foundation Foods, dataset
   Wild rice, dry, raw: Protein 12.7875 g, range 12.0-14.25; Zinc, Zn 5.845 mg, range 4.33-6.96, samples 8; Fiber, total dietary 4.26 g, range 3.56-4.98; Magnesium, Mg 108.5 mg, range 98.2-118.0
   USDA FoodData Central, Foundation Foods, release 2026-04-30, Wild rice, dry, raw · checked 2026-09-29
3. bwr-r6-03 · USDA FNDDS portion weights, dataset
   Rice, brown, cooked, no added fat (FNDDS 56205018): 1 cup, cooked 195 g; Quantity not specified 147 g; Rice, wild, 100%, cooked, no added fat (FNDDS 56205210): 1 cup, cooked 164 g; Quantity not specified 123 g
   USDA FNDDS 2021-2023, food codes 56205018 and 56205210 · checked 2026-09-29
4. bwr-r6-05 · systematic review
   The milling process shows a clear effect when compared at identical cooking times, with brown rice always producing a lower PPG and PPI response than white rice. However, at longer cooking times normally used for the preparation of brown rice, smaller and inconsistent differences are observed between brown and white rice.
   Br J Nutr, 2015 · checked 2026-09-29
5. bwr-r6-06 · RCT
   In healthy volunteers, the glycemic area and glycemic index were, respectively, 19.8% and 12.1% lower (p < 0.05) in brown rice than milled rice, while in diabetics, the respective values were 35.2% and 35.6% lower.
   Int J Food Sci Nutr, 2006 · checked 2026-09-29
6. bwr-r6-04 · USDA Table of Nutrient Retention Factors, dataset
   USDA-RETN-R6:431 RICE,WHITE/BROWN,COOKED,DRAINED, group Cereal Grains and Pasta: folate_total_ug 60% retained, thiamin_mg 75%, potassium_mg 85%, iron_mg 90%, magnesium_mg 95%, zinc_mg 95%, niacin_mg 95%
   USDA Table of Nutrient Retention Factors, Release 6, 2007, Retn_Code 431 · checked 2026-09-29
7. bwr-r6-07 · network meta-analysis of RCTs
   Barley, brown rice, wheat and wheat bran were shown to be ineffective in improving blood lipid compared with control.
   Eur J Nutr, 2019 · checked 2026-09-29
8. bwr-r6-09 · prospective cohort
   The multivariable-adjuted HR of developing CVD comparing ≥5 servings/wk with <1 serving/wk was 0.98 (95% CI: 0.84, 1.14) for white rice, 1.01 (0.79, 1.28) for brown rice, and 0.99 (0.90, 1.08) for total rice.
   Am J Clin Nutr, 2015 · checked 2026-09-29
9. bwr-r6-11 · EU claims register
   POL-HC-8508 Vibigaba (germinated brown rice) Contributes to the maintenance of normal blood pressure. -/- Non-authorised
   EU Register on nutrition and health claims, claim POL-HC-8508, snapshot 2026-09-21 · checked 2026-09-29
10. bwr-r6-08 · RCT
    Participants in GBR group were asked to consume 100 g/d GBR instead of equal refined grain (RG) for 3 months, while control group maintain their usual eating habits.
    Clin Nutr, 2023 · checked 2026-09-29
11. bwr-r6-10 · meta-analysis of cohort studies
    Inverse associations were observed for subtypes of whole grains including whole grain bread, whole grain cereals, wheat bran and brown rice, but these results were based on few studies, while white rice was associated with increased risk.
    Eur J Epidemiol, 2013 · checked 2026-09-29