Latest research actually shows coffee as being quite healthy.
Coffee has had a hot-and-cold reputation when it comes to health benefits. Drinking two to five daily cups of coffee may protect against heart disease, diabetes, and some cancers, but too much can cause problems like anxiety, nervousness, and insomnia. Now, a review of existing research suggests that a moderate approach to coffee is the best medicine. The results were published July 23, 2020, in The New England Journal of Medicine.
Based on their review of 95 studies, the authors suggest limiting total caffeine consumption from all beverages, including coffee, to 400 milligrams per day. That's equal to about four to five 8-ounce cups of most regular coffees. This amount helps people get much of the benefit of coffee but with a lower risk of caffeine's side effects, according to the researchers.
Scientists can't say for sure why coffee is healthy. Given that the benefits are more strongly related to coffee compared with other caffeinated drinks, they likely result from ingredients in coffee other than caffeine. Coffee also contains a combination of phytochemicals, magnesium, potassium, and vitamin B, all of which have shown to lower oxidative stress and improve metabolism.
https://www.health.harvard.edu/stayi...e-are-the-best
The study analyzed data from about half a million Britons and found that the more coffee people drank, the lower their risk of dying during the 10-year study period. Drinking eight or more cups per day was linked with 14% lower risk compared with not drinking any coffee.
https://jamanetwork.com/journals/jam...stract/2686145
Your morning cup of coffee provides more than a jolt of caffeine—it can also have significant health benefits. A September 28, 2015 Harvard Gazette article highlighted several studies by Harvard T.H. Chan School of Public Health researchers illustrating the positive effects of
coffee. One
study, led by
Alberto Ascherio, professor of
epidemiology and nutrition, showed that drinking four or five cups of coffee daily cut risk of Parkinson’s disease nearly in half compared with drinking little or no caffeine.
The benefits of coffee are wide-ranging—from protecting against type 2
diabetes and
cardiovascular disease to lowering rates of
depression among women. But it’s not entirely clear why coffee is so beneficial. “Coffee is a complex beverage,” Frank Hu, professor of
nutrition and epidemiology, told the Gazette.
https://www.hsph.harvard.edu/news/hs...-are-numerous/