Rice can be a whole grain, but it depends entirely on how much processing it has undergone. Brown rice, black rice, red rice, and wild rice are all whole grains. White rice is not. The difference comes down to whether the grain’s outer layers are still intact after milling.
What Makes Rice a Whole Grain
Every grain of rice starts with three parts: the bran (a fiber-rich outer layer packed with B vitamins, iron, magnesium, and antioxidants), the germ (the nutrient-dense core containing healthy fats and vitamin E), and the endosperm (the starchy interior that makes up most of the grain’s bulk). A rice kernel that keeps all three parts qualifies as a whole grain.
Brown rice is the most familiar example. After harvesting, the inedible outer husk is removed, but the bran and germ remain. That tan-colored coating you see on brown rice is the bran layer, and it’s the reason whole grain rice has more fiber, more minerals, and a chewier texture than white rice.
White rice goes through additional milling steps. Friction polishers strip away the bran and germ, removing roughly 8 to 10% of the grain’s total weight in the process. What’s left is the soft, white endosperm. That milling removes more than half the B vitamins, most of the vitamin E, and nearly all of the fiber. A final mist-polishing step gives white rice its smooth, glossy appearance.
Which Types of Rice Count as Whole Grains
The USDA’s Dietary Guidelines for Americans explicitly list brown rice and wild rice as whole grains, while white rice falls under refined grains. But several other varieties qualify too:
- Brown rice is the standard whole grain version. It retains the bran and germ, giving it significantly more fiber and protein than white rice.
- Wild rice is technically the seed of an aquatic grass, not a true rice, but it’s recognized as a whole grain. It contains slightly more fiber and protein than even brown rice.
- Black rice (sometimes called forbidden rice) keeps its bran layer intact and is especially rich in anthocyanins, the same antioxidant pigments found in blueberries and blackberries. It turns deep purple when cooked.
- Red rice varieties like Himalayan red rice and Thai red cargo rice also retain their bran and germ. They’re higher in protein, fiber, and antioxidants than white rice.
The general rule is simple: if the rice still has its colored outer layer, it’s a whole grain. If it’s white and polished, it’s refined.
Parboiled Rice: A Special Case
Parboiled rice is steamed in its husk before milling, which drives some nutrients from the bran into the endosperm. Parboiled brown rice is classified by the USDA as a whole grain. Parboiled white rice, however, is still a refined grain since the bran has been removed. It does retain more nutrients than standard white rice thanks to that pre-steaming step, but it’s not equivalent to a true whole grain.
How Whole Grain Rice Affects Your Health
The nutritional gap between whole grain and refined rice shows up clearly in blood sugar response. White rice has a high glycemic index of around 73, meaning it causes a relatively fast spike in blood sugar. Brown rice comes in at about 68, placing it in the medium range. That difference matters over time. A systematic review published in BMJ Open found that each daily 50-gram serving of brown rice was associated with a 13% lower risk of type 2 diabetes.
The fiber in whole grain rice also plays a role in digestion and satiety. Because the bran layer slows down how quickly your body breaks down the starch, whole grain rice keeps you feeling full longer than the same portion of white rice. The USDA recommends that at least half of all the grains you eat should be whole grains, and swapping white rice for brown rice is one of their specific suggestions for getting there.
Cooking Whole Grain Rice
The tradeoff with whole grain rice is that it takes longer to cook. Brown rice typically needs about 45 minutes of simmering plus 10 minutes of resting, compared to 15 to 20 minutes for white rice. A good starting ratio is 2 cups of water for every cup of brown rice. Black and red rice have similar cook times to brown rice, sometimes slightly longer.
If the longer cooking time is a barrier, a few approaches help. Soaking brown rice for 30 minutes to an hour before cooking cuts the simmer time noticeably. A rice cooker with a brown rice setting handles the timing automatically. And parboiled brown rice cooks faster than standard brown rice while still qualifying as a whole grain. The texture of whole grain rice is nuttier and chewier than white rice, which some people prefer once they’re used to it.