Regular Coffee Drinkers Have Cleaner Arteries

Drinking Coffee

Story at-a-glance

  • People who drank three to five cups of coffee daily were less likely to have calcium deposits in their coronary arteries
  • Moderate coffee consumption may lower your risk of clogged arteries, heart attacks, dementia, Parkinson’s, and more
  • Choose organic coffee, drink it black, and avoid environmentally destructive individual coffee pods


This is an older article that may not reflect Dr. Mercola’s current view on this topic. Use our search engine to find Dr. Mercola’s latest position on any health topic.

By Dr. Mercola

Coffee is one of the most popular beverages in America, with more daily devotees than even soda. According to the National Coffee Association (NCA), 61 percent of Americans drink coffee daily (compared to 41 percent for soda).1

Personally, I almost never drink coffee. I don’t like the taste, and I have more than enough energy to not need a caffeine boost. About the only time I use it is when travelling internationally to keep me up when I am tired to assist jet lag.

However, if you’ve been feeling guilty about this daily imbibing, perhaps worrying that the excess caffeine isn’t doing you any favors, don’t. Unless you are overdoing it or drowning your coffee with sweetener, a daily cup – or five! – can be quite good for you.

The coffee plant and its seeds (coffee beans) contain a natural blend of polyphenol antioxidants (including chlorogenic acids), bioflavonoids, vitamins, and minerals that all work together to offer some impressive health-promoting benefits, and even help neutralize the harsher effects of the caffeine that coffee naturally contains.2

There are literally more than 1,000 different chemicals in coffee and researchers are only beginning to tease out how the synergy between them might benefit your health.

A Few Cups of Coffee a Day May Help You Avoid Clogged Arteries

In a study of more than 25,000 people, those who drank a moderate amount of coffee – defined as three to five cups daily – were less likely to have calcium deposits in their coronary arteries than those who drank no coffee or more coffee daily.3

A large part of arterial plaque consists of calcium deposits (atherosclerosis), hence the term "hardening of the arteries." Coronary artery calcium can be a significant predictor of future heart disease risk.

The study suggests moderate coffee consumption may lower your risk of clogged arteries and related heart attacks. The researchers noted:4

“Our study adds to a growing body of evidence suggesting that coffee consumption might be inversely associated with CVD [cardiovascular disease] risk.”

Past research has also found that coffee appears to have a protective effect on the heart. For instance, one study showed moderate coffee drinking reduces your chances of being hospitalized for heart rhythm problems.5 Another study found it may trigger a 30 percent increase in blood flow in your small blood vessels, which might take some strain off your heart.6

First-Time Ever Coffee Recommendation from the 2015 Dietary Guidelines Advisory Committee

The Dietary Guidelines Advisory Committee (DGAC) released their most recent report in February 2015,7 which is intended to help the US Department of Health and Human Services and the US Department of Agriculture develop the soon-to-be-released 2015 Dietary Guidelines for Americans.

Along with advice to remove dietary cholesterol limits, DGAC, for the first time ever, addressed coffee consumption and concluded that it does not pose a health risk to healthy individuals.

This was based on an evaluation of multiple meta-analyses and other studies evaluating the link between coffee and chronic diseases, including cancer, type 2 diabetes, heart disease, Parkinson’s, and Alzheimer’s. They noted:8

“Strong evidence shows that consumption of coffee within the moderate range (3 to 5 cups per day or up to 400 milligrams per day caffeine) is not associated with increased long-term health risks among healthy individuals.”

In addition, the committee found that 400 milligrams (mg) of coffee daily might even lower the risk of type 2 diabetes, heart disease, and Parkinson’s disease. They also pointed out that most Americans don’t consume 400 mg of coffee daily, but rather tend to hover around 200 mg per day.

Keep in mind, however, that when referring to a “cup” of coffee, most research considers it to be five to eight ounces with about 100 mg of caffeine. In contrast, a small cup at many coffee houses starts at 12 ounces while a large cup may hold 20-24 ounces.

Coffee Might Lower Your Risk of Chronic Disease

In addition to the news that coffee might be good for your arteries, several other studies have also yielded promising results regarding coffee and chronic disease. For instance:9

  • Melanoma: Drinking four cups of caffeinated coffee daily might reduce your risk of melanoma, the most dangerous form of skin cancer.10
  • According to researchers, coffee constituents suppress UVB-induced skin carcinogenesis, induce cell apoptosis, protect against oxidative stress and DNA damage, reduce inflammation in epidermal cells, and inhibit changes in DNA methylation.”11

  • Non-Melanoma Skin Cancer: Women who consumed more than three cups of coffee a day had a significantly lower risk of basal cell carcinoma than those who consumed less than one cup per month.12
  • Multiple Sclerosis: Drinking four to six cups of coffee a day is associated with a lower risk of multiple sclerosis, as is drinking a high amount of coffee over five to 10 years. According to researchers, Caffeine has neuroprotective properties and seems to suppress the production of proinflammatory cytokines.”13
  • Dementia: Caffeine also promotes production of the neurotransmitters serotonin, dopamine, and noradrenaline, and triggers the release of brain-derived neurotrophic factor (BDNF), which activates brain stem cells to convert into new neurons, thereby improving your brain health.
  • Among people with mild cognitive impairment (MCI), those with higher blood levels of caffeine (due to coffee consumption) were less likely to progress to full-blown dementia.14

    Caffeine/coffee intake is associated with a reduced risk of dementia or delayed onset, particularly for those who already have MCI,” the researchers said.

  • Parkinson’s Disease: Higher coffee and caffeine intake are associated with a lower risk of Parkinson’s disease.15

Research published in the New England Journal of Medicine has even shown that coffee consumption is inversely associated with premature death. In other words, the more coffee drank, the lower the risk of death became, including deaths from heart disease, respiratory disease, stroke, injuries and accidents, diabetes, and infections.16

Why Does Coffee Give You a Boost?

You know it’s the caffeine in coffee that gives you energy, but do you know why? Caffeine provides a "lift" by blocking the normal action of adenosine. Adenosine forms from the breakdown of adenosine triphosphate (ATP), which is the molecule that provides cellular energy.

Adenosine triphosphate (ATP) normally slows down your brain's activity and induces sleepiness. Some people are caffeine sensitive and don't tolerate it well or have problems sleeping if they have caffeine too late in the day. Actually, the best time to drink coffee may be first thing in the morning (which is when many drink it anyway), especially when combined with exercise.

Research by Ori Hofmekler, author of The Warrior Diet and Unlocking the Muscle Gene, showed coffee increases your metabolism by up to 20 percent and can be quite beneficial if consumed before exercise.

A caffeine dose equivalent to two or three cups of coffee taken one hour prior to a half-hour-long workout reduced the participants' level of perceived muscle pain.17 This pain reduction could allow you to push yourself just a bit harder, which is important during high intensity exercises.

A 2005 meta-analysis also concluded that caffeine can reduce your perceived level of exertion by more than 5 percent—effectively making your exercise feel "easier."18 Moreover, caffeine improved exercise performance by more than 11 percent, which appears to be related to the reduction in perceived level of exertion. Research from Coventry University even found that caffeine helped offset age-related loss of muscle strength,19 which suggests that caffeine may help preserve your muscles as you age and reduce your risk of injuries.

Pregnant Women Should Not Drink Coffee

Despite the apparent benefits for your body, caffeine is not beneficial for your baby. Public health agencies suggest pregnant women limit daily caffeine to 200 mg (or about two cups of coffee a day). However, caffeine can significantly impact the growing fetus. It is able to freely pass through the placenta, and since caffeine does not provide any benefits to your baby, only potential hazards, I strongly recommend pregnant women avoid ALL forms of caffeine. Research has shown that consuming caffeine during pregnancy can result in a wide range of problems for your baby, including:

  • Increased risk of miscarriage
  • Low birth weight
  • Birth defects such as cleft palate
  • Increased risk of Sudden Infant Death Syndrome (SIDS)
  • Decreased cardiac function and heart damage

The Case for Drinking Your Coffee Black and Organic

If you are dousing your cup of Joe in creamer, non-dairy creamer, sugar, and other sweeteners and flavorings, you are missing out on the therapeutic benefits and potentially harming your health. The natural blend of polyphenol antioxidants are part of what makes coffee so healthy. However, some research suggests that adding dairy to your coffee may interfere with your body's absorption of beneficial chlorogenic acids.20 Meanwhile, if you add sugar to your coffee you’ll spike your insulin levels, which contributes to insulin resistance. If you're interested in the health benefits, drink your coffee black, without sugar, non-dairy creamer or cream, or flavorings.

If you really can't stand your coffee black, you could try adding non-dairy alternatives like coconut milk or a natural sweetener like stevia. As for buying organic, do so whenever possible. Coffee beans are one of the most heavily pesticides-sprayed crops. So, you should select only coffee beans that are certified organic. Remember, you will obliterate any positive effects if you consume coffee that's been doused in pesticides or other chemicals. Whenever possible, purchase sustainable "shade-grown" coffee to help prevent the continued destruction of our tropical rain forests and the birds that inhabit them.

There are many who say shade-grown coffee tastes better as well. In addition, you'll want to purchase whole bean coffee that smells and tastes fresh, not stale; if your coffee does not have a pleasant aroma, it is likely rancid. Grind it yourself to prevent rancidity, as pre-ground coffee may be rancid by the time you get it home. If you use a "drip" coffee maker, be sure to use non-bleached filters. The bright white ones are chlorine-bleached, and some of this chlorine will leach from the filter during the brewing process. Bleached filters are also notoriously full of dangerous disinfection byproducts, such as dioxin.

‘Kill the K-Cup’

You may have seen the viral video “Kill the K-Cup” on Youtube. It’s a satire showing a K-cup invasion – the result of increasing use, and waste, of the coffee pods. If you’re not sure what a K-cup is, they’re used with Keurig coffee makers, which brew a single cup at a time using small plastic coffee inserts. The “Kill the K-Cup” video includes some pretty sobering statistics:21

  1. “ In 2013, Green Mountain Coffee produced enough coffee pods to wrap around the equator 10.5 times.
  2. The new Keurig 2.0 does not offer reusable filters and the existing “my K-cup” filter does not fit on the machine.
  3. Green Mountain only makes 5% of its current cups out of recyclable plastic.
  4. Keurig Green Mountain’s mission is to have a Keurig System on every counter and a beverage for every occasion - hot, cold, maybe even soup.
  5. The pods are made of No. 7 plastic, which can’t be recycled in most places. They have an aluminum lid, which is hard to separate from the cup. Even if the plastic, aluminum, and coffee could be separated, the pod is too small to be handled by most recycling systems.
  6. TerraCycle, a company that provides recycling solutions for spent coffee pods, has teamed up with Tassimo, Mars Drinks, Nespresso and Illy, but despite reaching out to the company multiples times, has not be able to develop a relationship with Green Mountain (Keurig).”

In 2014, 9.8 billion Keurig-brewed portion packs were sold, and some estimates suggest the waste they accumulate would circle the Earth closer to 12 times (not 10.5). The product’s inventor, John Sylvan, was bought out of the company for $50,000 in 2007. In 2014, Keurig Green Mountain’s revenues totaled $4.7 billion in revenue, mostly from K-cups, which sell coffee for the equivalent of $40 per pound.22 Sylvan, who doesn’t own a Keurig machine by the way, noting they’re “kind of expensive to use… plus it’s not like drip coffee is tough to make,” told the Atlantic of his invention, “I feel bad sometimes that I ever did it.”23

As striking as the K-cup waste is now, it’s slated to get worse. “Keurig Cold” is scheduled to be released (in partnership with Coca-Cola) later this year, and the company continues to grow. Keurig Green Mountain counters their negative environmental press by saying the pods increase efficiency and cut down on wasted water, and they have pledged to make a fully recyclable K-cup by 2020. However, some say the pods will never be “good” for the environment. “No matter what they say about recycling, those things will never be recyclable,” Sylvan told the Atlantic. Another consideration is that while the inserts claim to be BPA and phthalate-free, they may still contain other plastics chemicals that could leach into your beverage, posing a potential risk to your health.

Which Is Healthier, Dark Roast or Light?

You probably choose your roast based on flavor, but there might be compelling health differences too. Darker roasts typically contain less caffeine than lighter roasts due to the prolonged heat breaking down more of the caffeine molecules. (Bean species also differ widely in their naturally occurring concentrations of caffeine.) Dark roast coffee, such as French or Italian Roast, or roasts used to make espresso or Turkish coffee, are typically higher in neuroprotective agents than green (unroasted) coffees. One study in Molecular Nutrition & Food Research found that dark roast coffee restored blood levels of the antioxidants vitamin E and glutathione more effectively than light roast coffee.24

The dark roast also led to a significant body weight reduction in pre-obese volunteers, whereas the lighter roast did not. Other studies have shown that dark roast coffee produces more of a chemical called N-methylpyridinium, which helps prevent your stomach from producing excess acid, so darker roast coffee may be easier on your stomach than lighter roast coffee.25 That said, the process of roasting will also produce acrylamide—a toxic byproduct created when you expose a food to high heat.

Acrylamide has been associated with an increased cancer risk. From the perspective of limiting your exposure to this toxin, a light roast might be preferable. I don’t claim to have the answer here, but the evidence supporting dark roast for higher antioxidant content is quite compelling. It could be that the higher antioxidant content of a dark roasted organic coffee might outweigh the acrylamide formed during the roasting process... but, unfortunately, I have no evidence to either confirm or refute this notion at this time.


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