Depending on what your grandparents ate, that could be dangerous too! In the old days, many people ate lots of lard and butter. I'm talking about them giving big sticks of butter to their kids to gnaw on like it was a corn cob. I've seen fat people doing this in Kansas to this day. Also lard was eaten, without being used for cooking first. And used lard was poured in a coffee can after frying, and reused again and again. A lot of people in older generations had bad teeth (or no teeth at all) because of the crap they ate.
Just eat sensible. This organic thing is a fad.