At least in the US, the initial processing of rice removes some nutrients, which is why white rice is required by law to be enriched by coating it with certain

At least in the US, the initial processing of rice removes some nutrients, which is why white rice is required by law to be enriched by coating it with certain vitamins and minerals. If you rinse your rice or cook it in excess water such as the paper recommends, you'd be removing the enriched coating, which could put you at risk of certain nutritional deficiencies if you ate a mostly rice-based diet.