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5 reasons why coffee may be bad for your health

Roasted coffee contains caffeine as well as many compounds that may be associated with health benefits. However, coffee is not suitable for everyone, and if consumed in excess, it can harm your health.

1. May disrupt your sleep

Caffeine stays in the body for more than six hours after your last sip. Drinking too much coffee or drinking it too close to bedtime can affect your ability to fall asleep, stay asleep, and the overall quality of your sleep.

To play it safe, limit your coffee consumption at least eight hours before bedtime, ideally limiting consumption to the afternoon or evening. That said, everyone’s tolerance and sensitivity to caffeine differs, so pay attention to how you feel throughout the day after drinking coffee and adjust the timing accordingly.

2. May disrupt digestive conditions

People with certain gastrointestinal (GI) conditions, such as gastritis, irritable bowel syndrome (IBS), and inflammatory bowel disease (IBS), may experience a worsening of their condition when consuming coffee.

3. May Affect Blood Pressure and Heart Health

Coffee consumption may make it more difficult for older people with hypertension (high blood pressure) to control their blood pressure.

Although not all researchers agree, some people have seen an increase in low-density lipoprotein (LDL) cholesterol, considered the “bad” cholesterol, when drinking unfiltered coffee made in a French press or percolator. High LDL levels can increase your risk of heart disease and stroke.

4. Overconsumption can cause health risks

Experts recommend a daily limit of 400 milligrams (mg) of caffeine for adults. This equates to about four 8-ounce cups of coffee per day, typically containing 80 to 100 mg per cup.

Pregnant people are advised to limit their caffeine intake to 200 mg per day (about two 8-ounce cups of coffee). It is not known whether excessive consumption would pose health risks.

Consuming too much caffeine can lead to:

  • Side effects: Overconsumption can cause increased anxiety, nervousness and insomnia.
  • Increased risk of bone fracture: Women who consume too much caffeine have been shown to have a higher risk of bone fracture.
  • Pregnancy complications: Pregnant people with high caffeine intake may be at risk of low birth weight, premature birth, and even miscarriage compared to those who consume it in moderation.

5. May contain unhealthy additives

What you add to your coffee can make it a less healthy choice.

Brewed black coffee is low in calories; 1 8-ounce cup contains just under 3 calories. A visit to a coffee shop will confirm that there are many ways to prepare coffee and many of these coffee drinks contain added sugars, flavorings, milk, cream and whipped cream. Be aware that these additions can reduce calories and mask the health benefits of coffee.

Potential health benefits

A few benefits have been associated with coffee consumption. Drinking coffee may reduce the risk of certain health problems, including:

  • Stroke
  • Type 2 diabetes
  • Cardiovascular disease
  • Parkinson’s disease (both its onset and progression)
  • Alzheimer’s disease
  • Depression
  • Certain cancers, such as colorectal cancer and liver cancer

Some factors that can affect the benefits of coffee include:

  • The amount you drink: A review of several studies showed a 9% reduction in the risk of depression in people drinking 4 or more cups of coffee per day. Likewise, people who drink around 3 to 5 cups of coffee per day are more likely to have a lower risk of heart disease.
  • Compounds other than caffeine in roasted beans: Once roasted, coffee beans contain over 1,000 bioactive compounds. Roasted beans are associated with certain antioxidant, anti-inflammatory and anti-cancer properties.
  • Brewing method: Filtered coffee (e.g., made with a paper filter) is considered the healthiest way to prepare your coffee beans.

Caffeinated or decaffeinated coffee

Caffeinated coffee contains around 80 to 100 mg of caffeine per cup, while decaffeinated coffee contains around 5 to 12 mg.

Many researchers have studied whether the caffeine content of coffee affects its health benefits. It has been determined that the bioactive properties of coffee are retained when caffeine is removed from the beans to produce decaffeinated coffee. Bioactive properties are the components of coffee that contain anti-inflammatory and antioxidant properties.

Verywell Health uses only high-quality sources, including peer-reviewed studies, to support the facts in our articles. Read our editorial process to learn more about how we fact-check and keep our content accurate, reliable, and trustworthy.
  1. US Food and Drug Administration. Revealing the Truth: How Much Caffeine is Too Much?

  2. Gardiner C, Weakley J, Burke LM et al. The effect of caffeine on subsequent sleep: a systematic review and meta-analysis. Sleeping with Rev. 2023;69:101764. do i 10.1016/j.smrv.2023.101764

  3. Bagheri Davisaraei Y, Nateghi S et al. Coffee and sleep: benefits and risks. Progressive brain resolution. 2024;288:81-114. doi: 10.1016/bs.pbr.2024.06.014

  4. Poole R, Kennedy OJ, Roderick P et al. Coffee consumption and health: general review of meta-analyses of several health outcomes. BMJ. 2017;359. doi:10.1136/bmj.j5024

  5. Rakic ​​V, Burke V and Beilin LJ. Effects of coffee on ambulatory blood pressure in elderly men and women: a randomized controlled trial. Hypertension. 1999 Mar;33(3):869-73. doi: 10.1161/01.hyp.33.3.869

  6. Sala LL, Pontiroli AE. Coffee, LDL cholesterol and cardiovascular risk. Nutrition, metabolism and cardiovascular diseases. 2021;31(9):2735-2736. doi:10.1016/j.numecd.2021.05.036

  7. American College of Obstetricians and Gynecologists. Moderate caffeine consumption during pregnancy.

  8. Harvard TH Chan School of Public Health. Coffee.

  9. Liu H, Yao K, Zhang W et al. Coffee consumption and risk of fractures: a meta-analysis. Arch Med Sci. 2012;8(5):776-783. doi:10.5114/aoms.2012.31612

  10. Gleason JL, Sundaram R, Mitro SD et al. Association of maternal caffeine consumption during pregnancy with child growth. JAMA Open Network. 2022;5(10):e2239609-e2239609. doi:10.1001/jamanetworkopen.2022.39609

  11. US Department of Agriculture. Coffee, infused nutrients.

  12. Johns Hopkins Medicine. 9 reasons why (the right amount of) coffee is good for you.

  13. Chan L, Hong CT, Bai CH. Coffee consumption and risk of cerebrovascular disease: a meta-analysis of prospective cohort studies. BMC Neurol. 2021;21(1):380. doi:10.1186/s12883-021-02411-5

  14. Tverdal A, Selmer R, Cohen JM, Thelle DS. Coffee consumption and cardiovascular disease mortality and total mortality: does the brewing method matter? Eur J Previous Cardiol. 2020;27(18):1986-1993. doi:10.1177/2047487320914443

  15. Hall S, Yuen JW, Grant GD. Bioactive constituents of caffeinated and decaffeinated coffee and their effect on depression risk – a comparative constituent analysis study. Drinks. 2018;4(4):79. doi:10.3390/drinks4040079


By Katie Wilkinson, MPH, MCHES

Katie Wilkinson is a public health professional with over 10 years of experience working in human health and wellbeing in an academic setting. His health literacy efforts have spanned many mediums throughout his professional career: from brochures and handouts to blogs, social media and web content.

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