Decaffeinated coffee enriched with chlorogenic acid does not significantly affect blood glucose levels in healthy humans, even though it does impact animals.
A systematic literature review was carried out using relevant keywords in prominent databases like PubMed, Google Scholar, Web of Knowledge, Science Direct, Medline, Cochrane, and Scopus. From an initial pool of 1593 articles spanning 2003 to 2018, duplicates, irrelevant titles, and abstracts were eliminated, leaving 25 potentially relevant articles. Only randomized clinical trials were considered, further reducing the list to six studies for qualitative analysis.
Despite some animal studies suggesting a beneficial impact of chlorogenic acid-enriched decaffeinated coffee on blood glucose levels, the selected human studies did not indicate a significant effect among healthy individuals. While various mechanisms have been proposed to explain the lack of effect, further light was not shed on these mechanisms in this review.
