how important is it to maintain a healthy lifestyle, and what foods are scientifically proven to be the healthiest?

Question: how important is it to maintain a healthy lifestyle, and what foods are scientifically proven to be the healthiest?
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Asked by elinorrrx to Chris on 10 Mar 2016.
- Christopher Blanford answered on 10 Mar 2016:
  
  Hi Elinorrrrrrrrrrrx
  
  Healthy lifestyle matters if you want to live for as long as possible and in a way that isn’t unpleasant. I think that’s worth something.
  
  Which foods? It’s as much about balance as about specific foods. You can’t just eat grapefruits and stay healthy. Some foods have a higher nutrient density than others, though. https://en.wikipedia.org/wiki/Nutrient_density
  
  Chris

Question: how important is it to maintain a healthy lifestyle, and what foods are scientifically proven to be the healthiest?