Wait a minute - haven't we all been eating brown rice because everyone said it's healthier than white rice? As it turns out, while it is full of fiber and selenium, there are also small amounts of arsenic in brown rice. Arsenic is a carcinogen known for increasing the likelihood of lung, bladder, and skin cancers. Not to mention heart disease.
Arsenic doesn't show up in white rice, as it has been polished, whereas brown rice has been left in tact with its natural fiber. The reality is that unless you eat brown rice every day, there isn't too much to worry about. Make sure the grains in your diet are varied and you won't have a problem with consuming too much arsenic. Mix it up with white rice, pastas, quinoa, and other carbs, as well as brown rice and you'll be okay.