Flavanols are small molecules found in many fruits, vegetables and cocoa, and people can easily ingest foods containing flavanols in their daily life. If you eat foods rich in flavanols, it will promote cardiovascular function. The improvement of cardiovascular function is helpful to improve cerebrovascular function. Some substance is beneficial to cerebrovascular function, but it will have a positive impact on cognitive function.
 Based on this, it can be concluded that if you want to improve cognitive function, you should eat foods rich in flavanols is correct.