Health benefits of Matta rice: Matta Rice, also known as Rosematta rice. The brown outer layer of Matta rice comprises various nutrients. One cup of Matta rice can contain 84 milligrams of magnesium and one gram of calcium. It also contains vitamins. Consuming whole Matta rice grains can significantly reduce the chance of heart disease and certain cancers. Due to the lower content of fat, saturated fat, and cholesterol, Matta rice is heart-friendly, keeping those important blood vessels clear of clogs and clots.