A study published in the Annals of Internal Medicine journal studied 521 330 people in 10 European countries over 16 years and found a statistically significant lower mortality rate among coffee drinkers.
In a Harvard study done in 2015, drinkers of both caffeinated and decaffeinated coffee saw benefits, including a lower risk of death from cardiovascular disease, neurological diseases, Type 2 diabetes and suicide.
Why the benefits? It is postulated that bioactive compounds in coffee reduce insulin resistance and systematic inflammation. It has been known for some time that inflammation is one of the most common causes of the aging process. In addition, antioxidants in coffee may also help protect cells and prevent chronic diseases.
However, everything in moderation. Four or more cups per day were associated with panic attacks, anxiety and nervousness.
I would advise limiting consumption of coffee to 3 cups per day, or at most 4.