Which grain is typically the least processed and retains the most nutrients?

Brown rice is considered the least processed grain among the options provided, and this is why it retains the most nutrients. Unlike white rice, which has had its bran and germ removed during processing, brown rice keeps these parts intact. The bran and germ are rich in essential nutrients, including fiber, vitamins, and minerals.

Basmati rice, while offering a distinct flavor and aromatic quality, is still typically more processed than brown rice, as it can also vary in its milling process. Parboiled rice undergoes a steaming process before milling, which can help with nutrient retention compared to white rice but does not match the nutrient density of brown rice. Therefore, brown rice stands out as the healthiest option because it retains the full benefits of the whole grain.