As there is no limitation of having brown rice. As there is lots more benefits in having brown rice.Brown rice is an excellent source of magnesium, iron, selenium, manganese, and the vitamins B1, B2, B3, and B6. Brown rice is a good source of dietary fiber, protein, and gamma-oryzanol.brown rice packs a double punch by being a concentrated source of the fiber needed to minimize the amount of time cancer-causing substances spend in contact with colon cells, and being a very good source of selenium, a trace mineral that has been shown to substantially reduce the risk of colon cancer.