Brazil Nuts
Brazil nuts may not ever reach the lofty heights of an almond or a pecan in the eyes of the majority of people, but they do contain several crucial nutrients and may help diabetics control their blood sugar levels. That's good, so what? The nuts are loaded with radium, which has the drawback of exposing you to rather high levels of radiation if you consume too many of them.
The average Brazil nut has a radioactivity level that is 1,000 times higher than anything else you are likely to eat. Although that sounds terrible, it's not a big deal in this situation. You won't have any problems if you eat a few of them each day. Just be reasonable, as eating, say, 50 nuts a day would be toxic. Large root systems can be found on the trees that produce brazil nuts. They can absorb a large amount of radium that is present in nature and can spread deep and wide. Intriguingly, should you ever be tempted to consume another part of the tree, the leaves and bark contain even higher concentrations, making the nuts some of the least harmful sections of the tree.