For example, let's talk about green beans. Within the listed ingredients, why are there big long scientific names to what I assume are chemicals that I know nothing about? I would think there would be green beans and water in the can. But no, there is much much more. There are preservatives and what else gawd knows what kind of poisons are in there. Canned goods to me, are for extreme emergencies. I wouldn't, I don't base my food storage on canned goods.
I do miss Spam though :P
Indeed, there is much discussion here about what diet and health. Checkout the Diet and Health thread with the Science topic.
Perhaps this link may be a good start for...
http://cassiopaea.org/forum/index.php/topic,21375.405.html