This article makes the case that beetroot juice could provide anti-aging benefits - healthspan not lifespan I am sure. How? Well, blood flow and youthful nitric oxide levels are simply so critical to cardiovascular health and cardiovascular health is so critical to supplying nutrients, immune cells, etc. to every tissue in the body. This article discusses how beetroot juice increase blood flow by 38% pre-race! http://www.worldhealth.net/news/beetroot-exercise-anti-aging-younger-brain/
I prefer spinach, carrots, kale as my sources of high nitrate foods as I think these are more protective possibly against nitrosamines.