A University College Cork study links both caffeinated and decaf coffee to changes in gut microbiome, stress, depression and cognition in surprising ways.
https://www.foxnews.com/food-drink/daily-coffee-habit-affect-brain-mood-unexpected-ways-study-finds
https://www.foxnews.com/food-drink/daily-coffee-habit-affect-brain-mood-unexpected-ways-study-finds