Last Updated on September 17, 2018 by Michael Joseph
Coffee is one of the most popular food and drink products in the world, and we consume over 400 billion cups annually.
Despite decades-long controversy on the health properties of coffee, the current consensus is overwhelmingly positive.
In fact, the latest research shows many exciting health benefits of drinking coffee.
This article looks at 15 of these benefits and examines how this popular drink affects our body.
1. A Morning Cup of Coffee Boosts Productivity
Operating with a clear, focused head is never easy first thing in the morning.
For this reason, many people enjoy a cup of coffee to wake themselves up and to get their mind working for a day at the office.
This really works too.
Interestingly, research shows that there is a correlation between coffee consumption and occupational performance.
Perhaps this is one reason why many companies provide free coffee to their employees!
You may also know that coffee contains caffeine, a psychoactive chemical that has stimulant effects.
2. Coffee May Lower the Risk of Alzheimer’s
Alzheimer’s disease is a progressive, neurodegenerative disease that causes a slow decline in memory and cognitive function.
It is devastating to sufferers and their close friends and family.
However, just like other chronic diseases, there are many aspects of our lifestyle that can increase—or reduce—risk.
Notably, recent research hints that coffee consumption is one factor that may help us avoid Alzheimer’s.
Although the evidence we have is not currently conclusive, it is “substantial” and coffee consumption is likely protective against mental deterioration (5).
In fact, there was a recent systematic review and meta-analysis on this very topic.
The study’s results demonstrated that in a total of 29,155 participants, there was a “significant inverse association” between highest coffee consumption and Alzheimer’s disease (6).
Therefore, as well as coffee making our mornings better, it may help protect our cognitive health in the future too.
This could be the most significant health benefit of drinking coffee.
3. Coffee Contains Health-Protective Compounds
You may not know caffeic and chlorogenic acid, but they have some very positive effects on human health.
Caffeic acid is a hydroxycinnamic acid – a kind of plant chemical believed to have health-protective properties. It is one of the most concentrated polyphenols in coffee, and you can read more about its chemical structure here.
Furthermore, recent studies on both compounds demonstrate some interesting benefits too. These beneficial features include enhancing the immune system of asthmatic children and protecting the liver from toxicity in animal studies (9, 10).
Additionally, clinical trials are investigating the compound as a possible treatment for esophageal cancer (11).
Despite this, we shouldn’t read too much into these potential benefits just yet.
For one thing, we have to bear in mind that these studies use more of the compound than what naturally occurs in coffee.
4. Coffee Consumption Lowers the Risk of Melanoma Skin Cancer
While many skin cancers are relatively mild in nature, melanoma is the exception.
This skin cancer is often fatal, and prevalence rates are quickly rising across the world.
In fact, the data is disturbing and shows a 500% increase in the number of cases over the last four decades;
However, unlike the popular narrative, sunlight alone is not the only risk factor.
The food we eat can significantly increase—or decrease—our risk of burning and developing skin cancer.
On this note, several studies show that coffee may protect against melanoma.
The mechanism of action here is likely that the polyphenols in coffee help to increase the UV resistance properties of our skin (12).
5. Coffee Contains a Wide Range of Polyphenols (Antioxidants)
As we discussed in the prior two points, coffee contains various polyphenols.
However, it is worth noting that coffee is one of the biggest providers of these compounds in the world.
In fact, some research suggests that coffee is the most significant dietary source of polyphenols in the American diet (15).
To demonstrate, here are the common polyphenols in the American diet and the primary dietary sources for each one;
Markedly, a range of studies shows they help to boost immunity and protect against age-related decline and inflammation (16).
This polyphenol content is one of coffee’s major health benefits, and all coffee contains these compounds, whether instant or freshly brewed.
6. Drinking Coffee Appears to Lower the Risk of Stroke
A further potential health benefit is an association between drinking coffee and a lower risk of stroke.
First of all, correlation does not equal causation.
- A Korean study of 146,830 individuals found that high coffee consumption (>3 cups per day) lowered stroke risk by 38% compared to non-coffee drinkers.
- A meta-analysis of 9 high-quality studies showed that those who drink >4 cups of coffee per day have a lower stroke risk than drinking <1 cup.
- Results from a systematic review of 11 studies featuring over 479,689 participants demonstrate that coffee mildly reduces stroke risk.
That said, not all the studies on this topic are positive.
On the negative side, one statistical analysis shows that the risk of ischemic stroke rises in the first hour after drinking coffee – especially among irregular coffee drinkers (20).
Despite this drawback, the bulk of the overall research on coffee lowering stroke risk is very positive.
7. Coffee May Help Reduce the Risk of Type 2 Diabetes
Some people say that type 2 diabetes (T2D) is a “modern-day plague.”
When you look at the numbers, perhaps they are right. For instance, 30.3 million Americans are living with T2D, and an additional one-third of the population has prediabetes.
It only gets worse. As of 2014, 422 million people worldwide suffer from the disease. Back in 1980, it was only 108 million (23).
How Black Coffee Helps Lower Diabetes Risk
As always, prevention is better than cure, and there are many strategies we can use to reduce our T2D risk.
Along with cutting out refined carbohydrates and simple sugars, coffee appears to provide some health benefits in this area too.
Notably, research shows that drinking coffee may cut our risk of developing type 2 diabetes;
- A systematic review of cohort studies—featuring over 1,247,387 participants—found that higher habitual coffee consumption is associated with a lower risk of type 2 diabetes (24).
- A further systematic review was undertaken that looked at studies between 1966 and 2013. Markedly, there was a clear and consistent inverse association between coffee and type 2 diabetes in a dose-dependent manner (25).
However, don’t think of coffee (or any food) as a magic bullet.
While coffee may offer some benefit, the best way to avoid type 2 diabetes is a good diet, exercise program, and adequate sleep.
8. Caffeine Has Various Health Benefits Too
While coffee contains many different compounds, some of the health benefits relate to one in particular — caffeine.
As well as being a useful tool for focus and alertness, research shows various advantages that caffeine provides;
- One randomized, controlled study demonstrated that 400 mg of caffeine per day clearly increases insulin sensitivity (26).
- A review of the existing evidence suggests that caffeinated coffee consumption lowers the risk of Alzheimer’s, Parkinson’s, and cardiovascular disease (27).
- A broad systematic review of caffeine intake and potential adverse outcomes was undertaken in 2017. This particular study showed that while there are benefits, there are no adverse health effects at consumption levels of up to 400 mg per day. This figure translates to approximately four cups of coffee (28).
To sum up, caffeine appears to have various positive impacts on our body.
However, some negative effects start to appear when we consume more than 400 mg – these effects become more prevalent in a dose-dependent manner.
9. Coffee May Protect Against Liver Damage
Some more positive effects of drinking coffee include its potential hepatoprotective properties.
First of all, “hepatoprotective” is a word that means something can prevent liver damage.
As a result, discussions have suggested coffee as having a potential role in the treatment of chronic liver diseases, including non-alcoholic fatty liver disease (NAFLD) – a condition which processed food fuels, and it is rapidly rising in prevalence.
For instance, high-level evidence from recent studies show that;
- In a systematic review, evidence suggests that coffee consumption may protect the liver from damage in non-alcoholic fatty liver disease (NAFLD) and lower the risk of metabolic syndrome (29).
- A systematic review examined coffee consumption and liver diseases. This review found that coffee consistently improves lab readings, reduces mortality, and improves overall survival. The authors state that for those with liver diseases, physicians should encourage daily coffee consumption (30).
- A randomized, controlled trial demonstrates that coffee has a protective effect against chronic hepatitis C. This trial showed that coffee consumption reduces oxidative damage while increasing telomere length and apoptosis rate (31).
10. Longevity Studies Show Coffee May Help You Live Longer
An increasing number of studies show coffee has an association with increased longevity.
A delicious drink that makes you feel better and live longer? It sounds too good to be true, and again – correlation does not equal causation.
However, research shows that there is an association between coffee consumption and lower mortality.
Two of the biggest ever studies were recent multi-national and multi-ethnic cohort studies involving over 700,000 participants.
Significantly, these two studies showed that;
- Among 185,555 participants of multiple ethnicities, higher coffee consumption—both caffeinated and non-caffeinated—was associated with a statistically significant lower risk of death (32).
- In 521,330 participants from 10 different countries, those in the highest quartile of coffee consumption had statistically lower all-cause mortality. The relationship was consistent and did not vary by country (33).
These impressive results are likely due to the health-protective bioactive compounds that coffee contains.
11. Coffee is Associated With a Reduced Risk of Cardiovascular Disease
Is coffee good for your heart?
The research on coffee and heart-health hasn’t always been consistent. However, there has never been any evidence of harm in otherwise healthy people.
On the contrary, the Framingham Heart Study found that caffeinated coffee consumption is associated with a lower risk of CVD mortality and disease progression in the elderly (34).
In recent years, accumulating research suggests that coffee likely exerts several health benefits relating to heart health.
Specifically, extensive systematic reviews show that;
- In an analysis of 36 studies involving 1,279,804 participants, those drinking 3 to 5 cups per day had the lowest CVD risk (35).
- Another review found that—in moderate doses of up to 4 cups oer day—coffee is safe and likely holds a benefit in reducing CVD mortality (36).
- A further meta-analysis of 21 studies featuring 997,464 participants also shows promise. In particular, the research shows that coffee consumption has a cler inverse relationship with cardiovascular mortality (37).
However, more coffee isn’t necessarily better. For instance, there appears to be a ‘U’ shaped curve with coffee’s protective benefits.
A few cups appear to benefit heart health, but increasing consumption over 4-5 cups per day may have an adverse outcome.
This chart from a meta-analysis shows how the relationship changes;
In short, sensible consumption of coffee may be ‘heart healthy’.
12. Coffee Drinkers have Lower Rates of Depression
A further health benefit of coffee drinking is the positive effect it appears to have on depression.
Put shortly; coffee drinkers are less likely to suffer from depression.
A systematic review of 23 existing studies demonstrates a clear, significant relationship between coffee consumption and lower rates of depression (38).
Additionally, a meta-analysis of studies involving 330,677 participants found evidence of a dose-response protective effect against depression.
Notably, the risk of depression decreased by 8% for every additional cup of coffee per day (39).
This effect seems understandable when we consider the positive impact on mood, energy, and focus a cup of coffee seems to bring.
13. Coffee Has a Protective Effect on Teeth and Gums
It seems that coffee also has benefits for dental health.
Research suggests that coffee contributes to oral health through protecting against periodontal disease.
One particular study showed an inverse relationship between drinking coffee and severe periodontitis (40).
Furthermore, a study of 1,152 dental patients found that higher coffee consumption correlates with a small but significant reduction in periodontal bone loss (41).
Additional research hints that coffee may have antibacterial and anticaries properties when consumed by itself (42).
This means black coffee, and not drinks like bulletproof coffee or sweet flavored drinks.
14. Caffeine Boosts Physical Performance
Coffee’s energy-giving properties are widely known, and they come down to the caffeine content of the drink.
On this note, coffee can play a role in improving physical sporting and exercise performance.
Also, a systematic review of 21 studies investigated these claims in relation to endurance athletes (46).
The researchers found that caffeine ingestion of approximately 3-6 mg per kilogram of bodyweight had performance-boosting effects.
To put it another way, the amount of caffeine to benefit a 70 kg individual would be somewhere between 210 and 420 mg. In real-world terms, this is equivalent to one or two Starbucks grande size coffees.
These benefits were variable between different studies, with performance improvements being somewhere between 0.3 and 17%.
However, it’s important to remember that caffeine is a drug and it can have some strong effects.
15. Higher Coffee Consumption Appears to Lower Cancer Risk
A further positive of coffee is the protective effect it seems to have against cancer.
While the mechanism of this effect is unknown, it seems reasonable to suggest that coffee’s ability to lower insulin levels and reduce inflammation plays a role.
For one thing, both of these are classified as likely factors in the development of cancer (47).
So, just how much of a protective action does coffee have against cancer?
The answer is hard to quantify, but some systematic reviews and meta-analyses show a consistent inverse relationship;
- Compared to a low coffee intake, the highest coffee intake may reduce the risk of oral cancer, pharynx cancer, colon cancer, liver cancer, prostate cancer, endometrial cancer, and melanoma by a respective (48).
- A meta-analysis of 40 prospective cohort studies found no negative effect from coffee. However, the study did find that coffee lowers the risk of bladder, breast, pancreatic, and prostate cancer among others (49).
However, this inverse relationship doesn’t show for all types of cancer.
For instance, a recent systematic review investigated coffee’s impact on colorectal cancer incidence. In this study, the evidence was insufficient to support that drinking coffee increases or decreases risk (50).
How Many Cups of Coffee Should You Drink Per Day?
If you tolerate coffee well, then the sweet spot appears to be somewhere in the 3-4 cups per day range.
Like with most things in nutrition, we are all unique as individuals, so go with whatever seems to work the best for you.
Overall, there’s every reason to suggest that a daily coffee has several positive health benefits.