Brightly colored fruits and vegetables get their color from flavanols, which are also found in tea and cocoa.
A small study, reported in Scientific Reports in November 2020, suggests that flavanols increase blood flow to the brain and oxygen uptake that increases the ability to solve problems.
In fact, the results are quick. In the study, people who had faster brain oxygenation after consuming high amounts of flavanols scored higher on cognitive tests and solved problems 11 percent faster. That was just two hours after consuming the flavanols.
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