This antioxidant-rich snack is perfect with a cup of tea in the afternoon, but it is also a real friend to your knackered brain.
But dark choc also contains flavonol that improves the circulation of blood to your bonce. In a 2009 study participants who drank hot cocoa were able to count backwards faster and did more mental maths without feeling tired. There's never been a better excuse to eat the brown stuff.
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