All the studies done around coffee are pretty skewed except a few of the more recent ones.
For a long time they kept changing whether it is good for you or not.
The problem is they were grouping ALL coffee drinkers together, that includes the people who go to starbucks and order a 1000 calorie, 90grams of sugar triple fudge macchiato with whip cream, and also anyone who at home even puts an entire tablespoon of sugar in their coffee.
All the studies on str8 black coffee show that it's a great antioxidant and possibly even helps prevent a lot of health issues.