Sure it is, moderation of lots of things is key. You can live your life anyway you'd like, and if that means eating nothing but seeds and doing yoga, so be it.
However, it doesn't matter how healthy you are, or how few your vices, when the bell tolls, away you go. Cancer doesn't give a **** whether you are vegan or not, nor do car crashes, accidents, or many diseases.
Find out how you want to live and make it so (I highly doubt many obese people are happy with how they're living), living in fear of doing this and that because you may get heart disease or cancer is ridiculous, and a fastrack to finding yourself full of regrets as you lay on your deathbed.
Let other's tip toe through the one life they have, me? I'm grabbing mine by the balls because rather than spending my time wishing my peeps had done less or been more careful, before they were gone, I recognize that in the end death comes sudden and it comes often, and no amount of avoidance will make you safe.
I advocate being being active and generally eating well, but that's more so that I can enjoy the life I have, while I have it, rather than focusing on trying to prolong it.