Here are a couple of papers about supposed mechanisms: Regarding caffeine: https://pubmed.ncbi.nlm.nih.gov/16709440/ https://pubmed.ncbi.nlm.nih.gov/16709440/

Here are a couple of papers about supposed mechanisms: Regarding caffeine: https://pubmed.ncbi.nlm.nih.gov/16709440/ https://pubmed.ncbi.nlm.nih.gov/16709440/ Regarding coffee polyphenols: https://pubmed.ncbi.nlm.nih.gov/16709440/ https://pubmed.ncbi.nlm.nih.gov/16709440/