How to distinguish normal food from super food

Blueberries on branch.jpg
Do you want to know, if there is scientific evidence for the health benefits of this new superfood? Take a look at this fantastic interactive visualization at Information is beautiful.

Snake Oil Superfoods?

 

Image Credits: "Blueberries, a so-called 'superfood' that actually does not have unusually dense nutrient content." ("Blueberries on branch" by Jim Clark) - [1]. Licensed under CC BY 2.0 via Wikimedia Commons.