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
If you want to eat foods rich in flavanols, it will have a positive effect on cognitive function