Pros And Cons Of Coffee

Key Takeaway

• Moderate coffee intake (3–4 cups/day) delivers antioxidant, metabolic, cognitive, and longevity benefits—yet pregnant people and caffeine-sensitive individuals should limit or avoid it.

People have been long debating about the pros and cons of coffee. Research has shown that the beverage can be much healthier than we ever thought.

Studies suggest that moderate coffee consumption may lower your risk of certain diseases. Some of these diseases are Alzheimer’s and diabetes. 

Pros of Drinking Coffee

Coffee Is Good For Your Brain

Caffeine is a stimulant. It can alert you, increase energy levels, and improve memory and thinking skills. The caffeine in coffee can help develop and increase your brain performance.

Coffee has been shown to help with:

• Increased alertness
• Improved memory
• Better concentration (this one is great if you’ve got a big project due tomorrow)

Coffee may help lower your cholesterol level and blood pressure. It increases levels of adenosine triphosphate (ATP). ATP is an energy level boost when you drink coffee! Coffee also reduces inflammation in your body.

Research published in Neurology found that adults 60+ who drank 2–3 cups daily showed 30% fewer cognitive issues over five years (Poole et al., 2017).

Harvard T.H. Chan School of Public Health (2025) also reports antioxidants and anti-inflammatory compounds—even in decaf—contribute to neuroprotection and a 15% lower risk of early mortality.

Lessens Risk For Type 2 Diabetes

Coffee can help reduce people’s risk of getting type 2 diabetes. A study found drinking coffee may lessen the possibility of developing type 2 diabetes more than non-coffee drinkers. Other studies have shown similar results.

A lot of factors can affect whether you will develop type 2 diabetes. Drinking coffee has some benefits when it comes to disease prevention. But, as with anything else (including water), too much can be harmful.

A 2021 meta-analysis in Nutrients linked coffee to a lower incidence of obesity, metabolic syndrome, and type 2 diabetes—while still capping safe intake at 400 mg caffeine (≈4–5 cups) per day.
But remember, too much caffeine can interfere with some medications and hormones (Butt & Sultan, 2011).

Coffee Can Help You Lose Weight

Coffee is proven to help with your metabolism, which can help you shed a few pounds. Academic articles have shown that caffeine may increase your metabolic rate. That means your body can shed off more calories for the whole day. Caffeine also suppresses appetite, so it can help keep you from eating too much during meals.

Coffee is a natural appetite suppressant. Its caffeine content makes you feel fuller for longer periods after consuming it. When full and satisfied, we don’t crave as much food as before.

Research also shows that caffeine can increase fat-burning potential by 11% daily. That means drinking coffee before eating your morning meal can help you lose weight!

Lessens Skin Cancer Risk

Polyphenols are antioxidants that the body takes in. Coffee has an antioxidant that may help to prevent skin damage. It also contains a lot of polyphenols.

Antioxidants help to fight free radicals. These free radicals cause oxidative stress and may lead to skin cancer. A study found that drinking caffeinated coffee lowered the risk of developing BCC compared to those who didn’t drink coffee. They also suggest that drinking 1-3 cups of brewed coffee increases your risk for BCC by only 22%.

Coffee protects against sunburn. Caffeine can decrease UV absorption by up to 50%! But you should still apply sunscreen before heading outdoors. Coffee doesn’t do much good after damage!

Coffee May Lower Your Risk Of Stroke

There are countless reasons to make coffee a part of your daily meal. It may boost your brainpower and help you feel more alert; it’s a great way to finish your day and help you stay healthy. American Heart Association also says coffee may lower your risk of heart disease.

Harvard T.H. Chan School of Public Health (2025) ties moderate intake (3–5 cups/day) to reduced cardiovascular mortality.

Lowers Risk Of Alzheimer’s And Parkinson’s Disease

Coffee can help you avoid Alzheimer’s and Parkinson’s disease. Coffee can also prevent dementia, Multiple Sclerosis, stroke, and liver cancer.

Umbrella review (Poole et al., 2017) shows 18% lower cancer risk and reduced neurodegenerative disease incidence at 3–4 cups/day.

A Neurology journal found that drinking coffee can prevent Alzheimer’s disease. They also found that it can help certain conditions like dementia. The research looked at 4,000 people over 60 years old. They found that those who drank 2-3 cups of coffee were less likely to develop cognitive issues. 

Coffee Can Boost Athletic Performance

Caffeine can boost energy and help you perform better on the court or field. Coffee also contains antioxidants that can reduce muscle cramps. Drinking coffee can speed up recovery after exercise. Also, drinking coffee before or during workouts could increase endurance and strength.

One study found that caffeine drinkers had greater exercise capacity than non-caffeine drinkers. Also, participants who consumed 200 mg/ 3 hours had better results.

How to Maximize Coffee’s Benefits

• Grind size: Use a medium grind for drip, fine for espresso, coarse for French press.
• Water temperature: Aim for 90–96 °C to extract flavors without bitterness.
• Brew time: 4–5 minutes for French press; 2–3 minutes for pour-over.

Recommended Daily Intake

Research consensus (MDPI 2020; Nutrients 2021; Poole et al., 2017) supports 3–4 cups/day (up to 400 mg caffeine) for most adults. Pregnant individuals should limit intake to 200 mg/day to avoid complications like low birth weight (Poole et al., 2017).

Cons Of Drinking Too Much Coffee

Pregnancy & Bone Health Risks

Poole et al. (2017) note higher odds of preterm birth and low birth weight with ≥5 cups/day, and some evidence links excessive caffeine to reduced bone density in women.

While coffee can be a great way to kick-start your day, too much of it can have negative effects. Regulate your coffee consumption if you feel any of the following symptoms:

Insomnia

Caffeine energizes the brain and increases a person’s alertness. If you are caffeine sensitive, avoid drinking coffee at night. That will prevent you from falling asleep at night.

Anxiety

Drinking large amounts of coffee can contribute to some individuals’ anxiety. This effect happens to those who consume large amounts of caffeine in one sitting.

Restlessness

Overconsumption causes some people’s heart rates and blood pressure levels to rise. Also, their bodies’ production of cortisol can increase. These changes occur when you drink high doses of coffee over short periods. But even low doses can trigger this if coffee is taken for several weeks straight. It would help if you gave your body time off between each dose intake session to avoid feeling restless.

Butt & Sultan (2011) highlight potential interactions with hormonal therapies (e.g., oral contraceptives).

Stomach Problems 

Caffeine can cause stomach problems like nausea and diarrhea. It is because coffee can level up stomach acid rates, which may lead to an upset stomach and, for some, diarrhea. 

Wiley (2024) warns of gastric irritation and withdrawal headaches after sudden cessation.

Headaches

Caffeine can cause headaches. It can constrict the blood path going to your brain. Once you stop drinking coffee, the vessels enlarge. To alleviate caffeine-related headaches, increase your water intake. 

Bad Breath

If you’re a coffee lover, you may have noticed that your breath tends to get pretty rank after a cup or two of java. But why?

Tooth Decay

To begin with, drinking coffee can stain your teeth over time. The caffeine in coffee is an acidic compound. It’s about as acidic as vinegar and orange juice. When it comes into contact with the enamel on our teeth, it causes them to erode and wear away quicker. It will eventually cause your tooth to decay and stain. So if you want your pearly whites to stay that way, be sure not to drink too much coffee!

It Can Make You Feel Jittery

When you drink coffee, it can make you feel jittery and nervous. It is because caffeine makes your blood pressure increase. An increase in blood pressure stimulates the central nervous system. It can also cause other side effects, such as increased heart rate and sweating. But, many report that the jittery feelings go away when they get used to having coffee every day.

Dehydration

When it’s hot out, coffee can increase the risk of dehydration. It is because coffee acts as a diuretic. It encourages the body to remove more water, which can make you feel thirsty. In other words, drink enough water when hot and muggy weather. It’s so that your body doesn’t mistake thirst for an urge and need for caffeine.

Frequently Asked Questions

Conclusion: Pros and Cons of Coffee

There are countless benefits to drinking coffee. If you’re worried about the cons, remember that moderation is key. And if you experience side effects, switch to decaf for a while before returning to regular brew.

References

American Heart Association News. (2018, September 28). Is coffee good for you or not? American Heart Association. https://www.heart.org/en/news/2018/09/28/is-coffee-good-for-you-or-not

Butt, M. S., & Sultan, M. T. (2011). Coffee and its consumption: Benefits and risks. Critical Reviews in Food Science and Nutrition, 51(4), 363–373. https://doi.org/10.1080/10408398.2010.483702

Cappelletti, S., Piacentino, D., Sani, G., & Aromatario, M. (2015). Caffeine: Cognitive and physical performance enhancer or psychoactive drug? Current Neuropharmacology, 13(1), 71–88. https://doi.org/10.2174/1570159X13666141210215655

Del Coso, J. (Ed.). (2020). Coffee and caffeine consumption for human health [Special issue]. MDPI. https://doi.org/10.3390/books978-3-03928-629-4

Harvard T.H. Chan School of Public Health. (2025). Coffee and health: What the research says. The Nutrition Source. https://www.hsph.harvard.edu/nutritionsource/food-features/coffee/

Poole, R., Kennedy, O. J., Roderick, P., Fallowfield, J. A., Hayes, P. C., & Parkes, J. (2017). Coffee consumption and health: An umbrella review of meta-analyses of multiple health outcomes. BMJ, 359, j5024. https://doi.org/10.1136/bmj.j5024

Wiley, J. (Ed.). (2024). Coffee: Emerging health effects and disease prevention. John Wiley & Sons.