This was just posted to a list I belong to:
Beetroot juice 'boosts stamina'
Drinking beetroot juice boosts stamina and could help people exercise for up to 16% longer, a UK study suggests.
A University of Exeter team found nitrate contained in the vegetable leads to a reduction in oxygen uptake - making exercise less tiring.
Also: I lived in Europe and I still have discussions about diet with people in foreign countries. So I am very well aware that things vary from country to country. I've also lived in several different states in the U.S. Availability of things and laws about food vary from state to state within the U.S. as well.