bacon, processed meats are cars again i can -- carcinogenic. in the same study as tobacco. a different study says there is possibly a genetic composition how your body processes meats. if you have this genetic variance you will likely develop colorectal cancer down the road. if you lack the gene you doesn't have the risk. jon: how do we know if we have the jean or processed bacon or not? >> most people will never know. jenna: really? >> we're far from that in the way we manage people. perhaps within our lifetimes we'll be able to test everyone for genes and say you're okay, you're not okay. jenna: so we know because we would all like to rely on bit of a guidance.is there any way to s initial research whether there are certain people, certain groups, from certain regions of the world have to be more worried about it? or is it not even that specific