So how much coffee is healthy, and how much is too much? Two to three eight-ounce cups per day is considered moderate; heavy coffee drinkers consume four cups or more daily. Remember, the amount of caffeine per coffee beverage varies depending upon the preparation and style of beverage. Eight ounces of brewed coffee may contain as little as 80 to as much as 200 mg of caffeine per cup (an “average” cup probably contains about 100 mg).
"My guess is that they're working together to have some of these benefits," Harvard researcher Walter Willett, who authored a similar study that found a link between coffee consumption and lower risk of early death, told NPR in 2015. “The coffee bean itself is loaded with many different nutrients and phyto-chemicals,” many of which aid in insulin resistance and inflammation reduction.
When you’ve ordered a latte or a cappuccino at Starbucks, you’ve probably watched as the barista wipes down the steamer before whipping up a new cup. This is meant to fight bacteria, but you may be getting something extra in your drink that you probably don’t want. “What you don’t realize is that sanitizing solution ends up in your frothed milk! It’s not a ton, but it is there—a small amount on that wand for every frothed carafe! So avoiding lattes is a good choice if that concerns you,” Immer says. Or just prepare yours at home to make sure you’re not getting more than you bargained for. This is the healthiest coffee you can drink.
"Association of Coffee and Caffeine Intake With the Risk of Parkinson Disease " G. Webster Ross, MD; Robert D. Abbott, PhD; Helen Petrovitch, MD; David M. Morens, MD; Andrew Grandinetti, PhD; Ko-Hui Tung, MS; Caroline M. Tanner, MD, PhD; Kamal H. Masaki, MD; Patricia L. Blanchette, MD, MPH; J. David Curb, MD, MPH; Jordan S. Popper, MD; Lon R. White, MD, MPH. JAMA. doi:10.1001/jama.283.20.2674. 2000;283(20):2674-2679. Accessed 15 December 2013.
Coffee is one of the world’s most popular beverages for a reason: It not only tastes good and gives you a serious jolt of energy, but it also has plenty of amazing, body-boosting benefits. Which, in all honestly, is a major bonus considering the fact that most people are simply pleased to have something to help them get through their morning meetings.

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Feeling a little slow lately? All it might take to get your body back to working at a normal pace is a little coffee. A 2005 study from the Radiological Society of North America found it doesn’t take much—just a couple cups—to improve your reaction time, making you better at everything from noticing something scary like smoke in your home (and realizing you need to grab the fire extinguisher ASAP) to breaking your car for a stop sign. 
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