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They found that eating 300g of the vegetable reduced the amount of oxygen needed to power muscles by as much as five per cent when exercising. The effect was so powerful that it worked after just three days.
The researchers fed people pure nitrate supplements - the equivalent to the amount in a plate of spinach - every day for three days.
At the beginning and end of the experiment they were made to pedal strenuously on an exercise bike while their oxygen intake was measured via a tube to the mouth It was found that the difference in energy intake was between three and five per cent - a significant figure.
Spinach as A Superfood
"We're talking about an amount of nitrate equivalent to what is found in two or three red beets or a plate of spinach,"
"We know that diets rich in fruits and vegetables can help prevent cardiovascular disease and diabetes but the active nutrients haven't been clear. This shows inorganic nitrate as a candidate to explain those benefits."
Scientists discovered that it is not iron but nitrates which are abundant in spinach and that are responsible for its health benefits. These chemicals make the mitochondria - the "engine rooms" of every cell - more efficient, they found.
"It is like a fuel additive for your muscles - it makes them run much more smoothly and efficiently," said the lead author of the study.
Research Paper Details:
Larsen FJ, Schiffer TA, Borniquel S, et al. Dietary Inorganic Nitrate Improves Mitochondrial Efficiency in Humans. Cell metabolism, 2011; 13 (2): 149-159.
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