These two building blocks must be in place before you hope to reap the full rewards of other things that you can do to achieve and maintain good health. Ignore these and at best, you'll be wasting money... at worst, you're literally be courting disaster!
How long we live is certainly important and living without disease is probably going to maximize that number. But think how great it would be to maximize the quality as well as the quantity.
Do the right thing nutritionally and you can have it all.