Few foods have been as misunderstood as coffee.

Depending on the decade—or even the week’s headlines—it has been blamed for raising blood pressure, praised for sharpening the mind, questioned for its effects on the heart and celebrated for helping people live longer.

Now, after reviewing decades of increasingly rigorous research, the American Heart Association (AHA) has reached a reassuring conclusion: for most healthy adults, moderate coffee drinking isn’t something to fear. In fact, it can fit comfortably within a heart-healthy lifestyle and may even be associated with a lower risk of several cardiovascular conditions.

For coffee lovers, it’s certainly welcome news. But perhaps even more intriguing is that coffee’s health story no longer stops with the heart. A growing body of research suggests your daily brew may also support liver health, nourish beneficial gut bacteria and contribute to healthy aging in ways scientists are only beginning to understand.

Coffee lovers, take heart 

Rather than relying on a single study, the AHA’s new scientific statement reviewed decades of research—including an increasing number of randomized clinical trials—to answer a question doctors hear every day: How much coffee is actually safe?

The research suggests that consuming up to 400 milligrams of caffeine per day—roughly five 8-ounce cups of brewed coffee—is generally considered safe for healthy adults, and does not appear to increase cardiovascular risk. More importantly, people who regularly drink about two to four cups per day consistently show the strongest associations with better cardiovascular outcomes, including lower risks of coronary heart disease, heart failure and stroke.

That doesn’t mean more is necessarily better. The AHA emphasizes that the strongest evidence for benefit lies in moderate, not maximum, consumption. Individual responses to caffeine also vary depending on genetics, medications, age and underlying health conditions.

Researchers also note that coffee’s health effects aren’t explained by caffeine alone.

Coffee contains thousands of naturally occurring compounds, including chlorogenic acids, polyphenols and other antioxidants that may help reduce inflammation, improve blood vessel function and protect cells from oxidative stress. Scientists believe these bioactive compounds likely work together to produce many of coffee’s observed health benefits.

A few caveats 

Not surprisingly, a plain cup of brewed coffee is very different from a beverage loaded with flavored syrups, whipped cream and added sugars, all of which can undermine the metabolic benefits associated with coffee itself.

The brewing method matters, too.

Unfiltered coffees—including French press, Turkish and boiled coffee—contain naturally occurring compounds called cafestol and kahweol, which can raise LDL (“bad”) cholesterol. Paper-filtered coffee removes much of these compounds, making it a better everyday choice for people managing their cholesterol.

And while coffee appears safe for most adults, it isn’t for everyone. People who are pregnant, highly sensitive to caffeine or living with certain medical conditions should follow individualized advice from their healthcare provider.

One of coffee’s strongest health stories may be your liver

Heart health may dominate the headlines, but some of coffee’s strongest scientific evidence actually comes from the liver.

Over the past decade, numerous large prospective studies and meta-analyses have linked regular coffee consumption with lower risks of fatty liver disease, liver fibrosis, cirrhosis, liver cancer and liver-related mortality.

Scientists aren’t entirely sure why. One leading theory is that coffee’s antioxidants and anti-inflammatory compounds help reduce chronic inflammation and scarring in liver tissue.

The encouraging news is that these associations have been observed with both caffeinated and decaffeinated coffee, suggesting caffeine isn’t the only beneficial ingredient. At the same time, researchers emphasize that these findings show an association—not proof that coffee directly prevents liver disease.

What about the brain?

Coffee may also have something to say about healthy cognitive aging.

Earlier this year, a large prospective Harvard study following more than 130,000 adults found that people who drank two to three cups of caffeinated coffee a day had a lower risk of developing dementia than non-drinkers. Similar associations were also observed with moderate tea consumption, while decaffeinated coffee did not show the same relationship.

Researchers caution that this was an observational study, meaning it cannot prove that coffee directly prevents dementia. Still, the findings add to a growing body of evidence suggesting that moderate coffee consumption may support long-term brain health.

Coffee may also fuel your “second brain”

Another exciting frontier is the gut microbiome—the trillions of bacteria that influence everything from immunity to metabolism and, increasingly, healthy aging.

Recent research has found that regular coffee drinkers tend to have higher levels of several beneficial bacterial species, including Lawsonibacter asaccharolyticus, a microbe increasingly associated with a healthy gut ecosystem.

Researchers believe coffee’s polyphenols may act somewhat like prebiotics, helping nourish beneficial microbes. Scientists are still working to understand exactly how these changes influence long-term health, but the findings add to growing evidence that coffee’s benefits extend well beyond its caffeine content.

Because gut health is closely connected to inflammation, immune function and even brain health, this is one of the most promising areas of coffee research today.

Coffee or tea?

When it comes to healthy aging and longevity, this may be the wrong question. Nutrition scientists increasingly see coffee and tea not as competitors but as complementary beverages.

Coffee appears particularly strong in research involving cardiovascular health, liver health, metabolism and Type 2 diabetes risk.

Tea—especially green and black tea—has an impressive body of evidence supporting vascular health, healthy blood pressure and antioxidant intake through compounds known as catechins.

Rather than asking which beverage is “better,” many experts suggest enjoying both. Each delivers a different mix of beneficial phytochemicals, providing greater diversity of plant compounds that may help support healthy aging.

The SuperAging takeaway

Coffee isn’t a longevity miracle—and it can’t replace the fundamentals of healthy aging, such as regular exercise, a nutritious diet, restorative sleep and meaningful social connections.

But as longevity science continues to evolve, coffee is undergoing something of a scientific redemption. Once viewed with uncertainty or even suspicion, it’s increasingly recognized as a beverage that can comfortably fit within a healthy lifestyle—and one that may offer meaningful benefits for the heart, liver, gut and perhaps even the brain.

Sometimes the healthiest habits aren’t the newest biohacks or the most expensive supplements. Sometimes they’re the simple daily rituals we’ve been enjoying all along.