Not only that but radiation in small amounts is good for you.  It's called radiation hormesis.  Simply put it's like working out.  you work out, tear muscle, muscle grows back stronger.  Radiation kills cells, cells grow back stronger.  Of course this is for low amounts of radiation, not large amounts.  But anything most people get exposed to is low.  And to put more emphasis on low, there are parts of the world, such as India and Egypt, that get 20 times the amount of natural background radiation that the US gets and they're not suffering from it at all.  It was also found that the workers who helped clean up Chernobyl had much lower cancer rates than the rest of the population.    Link And just to keep this on topic, fat is bad for you.  If you don't know that, you're probably fat.