Do you think you could survive on only foods in cans?

I think so.

It could be the next great thing. I'm off to register www.onlycans.com.

if one had to they could

Yes, but I wouldn't enjoy it.

Yes. Meat, fish, vegetables, fruit, legumes can all be canned and most of the nutrients preserved. It would get a bit tedious, but I am sure you could live healthily on tinned food only.

Easily

Depends. Will I be able to open the cans?