Drinking coffee has long been demonized as an unhealthy habit, but research shows this is unjustified. In fact, a couple cups of coffee per day provides a variety of powerful health benefits.
In this article, we’ll look at 6 of these benefits as well as how much coffee is too much.
Table of Contents
Antioxidants are molecules that prevent cellular damage that can, over time, lead to the development of many types of disease and dysfunction.
While we’ve all heard eating fruits and veggies is a good way to get our antioxidants, most of us haven’t heard that drinking coffee isn’t just another way…it can be a better way.
Research shows that coffee is actually a major source of antioxidants in the Western diet.
A rather massive study was published in 2012 wherein researchers analyzed the coffee consumption of over 400,000 people and, after adjusting for smoking and other potential confounders, found a significant association between coffee consumption and longevity.
That is, that those who drank the most coffee generally lived longer than those that drank less or none, and the more they drank, the longer they lived.
To be specific, coffee drinkers had a significantly lower risk of dying from many different causes including heart disease, respiratory disease, stroke, diabetes, and even infections and injuries and accidents.
4 to 5 cups per day was associated with a 12% reduction in risk of death by those causes in men and 16% in women, but drinking 6 or more cups per day provided no additional benefits. Just 1 cup per day was associated with a 5 to 6% reduction.
These associations were seen in both caffeinated and decaffeinated coffee, so caffeine alone doesn’t account for the benefits.
It’s worth noting that this type of observational research can’t establish causation (we can’t definitively say it was the coffee causing these reductions in mortality), but it does bode well, and adds to the existing literature demonstrating similar effects.
Any regular coffee drinker could have told you this, but it’s actually been scientifically validated.
Caffeine, the world’s most popular drug, has more value to us fitness folk than the energy high.
The mechanism by which it aids weight loss is quite simple: it speeds up your body’s metabolic rate by increasing the amount of catecholamines in the blood, which are chemicals that mobilize fat stores to be burned for energy.
Given the effects of caffeine, it’s not surprising that coffee consumption as also been shown to improve exercise performance.
Type 2 diabetes is a veritable epidemic these days, afflicting about 300 million people worldwide. It’s characterized by insulin resistance, high blood sugar levels, and impaired insulin production.
Well, research shows strong associations between coffee drinking and a reduced risk of developing this disease.
- This study found that subjects reporting 4+ cups of coffee per day were 30% less likely to develop Type 2 diabetes.
- This study found that daily consumption of at least 3 cups of coffee reduces the risk of Type 2 diabetes by 42%.
- This study found that those that drank 12 (!) cups or more per day were 67% less likely to develop Type 2 diabetes than non-drinkers.
Research shows that coffee may protect against liver and colorectal cancer, two of the most common types of fatal cancers.
This meta-analysis of 9 cancer studies involving over 240,000 subjects found strong associations between coffee consumption and a reduced risk of liver cancer. Just 2 cups per day was associated with a 43% reduction in risk of developing the diseases.
This study, which involved the analysis of the diets and lifestyles of nearly 490,000 individuals and found that coffee drinkers were 15% less likely to develop colon and rectal cancers.
Despite all its benefits, drinking too much coffee can be harmful to your health.
This study, which tracked more than 43,000 people for an average of 17 years, found an increase in all-cause mortality in heavy coffee drinkers (32+ ounces per day).As it’s observational research, the actual mechanisms of why this could be were not explored, but here are two sensible rules of thumb for healthy coffee consumption:
1. Drink your coffee early in the day so it doesn’t interfere with your sleep. Too little sleep can cause a host of health issues including impaired endocrine and metabolic function and inflammatory responses.
2. Keep your coffee intake below 4 8-ounce cups per day. Remember that many places sell 16, 20, 24 or even 28-ounce “cups” of coffee.
What do you think about these benefits of coffee? Have anything else to share? Let me know in the comments below!
+ Scientific References
- Banks, S., & Dinges, D. F. (2007). Behavioral and physiological consequences of sleep restriction. In Journal of Clinical Sleep Medicine (Vol. 3, Issue 5, pp. 519–528). American Academy of Sleep Medicine. https://doi.org/10.5664/jcsm.26918
- Liu, J., Sui, X., Lavie, C. J., Hebert, J. R., Earnest, C. P., Zhang, J., & Blair, S. N. (2013). Association of coffee consumption with all-cause and cardiovascular disease mortality. Mayo Clinic Proceedings, 88(10), 1066–1074. https://doi.org/10.1016/j.mayocp.2013.06.020
- Sinha, R., Cross, A. J., Daniel, C. R., Graubard, B. I., Wu, J. W., Hollenbeck, A. R., Gunter, M. J., Park, Y., & Freedman, N. D. (2012). Caffeinated and decaffeinated coffee and tea intakes and risk of colorectal cancer in a large prospective study. American Journal of Clinical Nutrition, 96(2), 374–381. https://doi.org/10.3945/ajcn.111.031328
- Larsson, S. C., & Wolk, A. (2007). Coffee Consumption and Risk of Liver Cancer: A Meta-Analysis. Gastroenterology, 132(5), 1740–1745. https://doi.org/10.1053/j.gastro.2007.03.044
- De Valk, H. W. (1999). Magnesium in diabetes mellitus. In Netherlands Journal of Medicine (Vol. 54, Issue 4, pp. 139–146). Neth J Med. https://doi.org/10.1016/S0300-2977(99)00005-4
- Shearer, J., Farah, A., De Paulis, T., Bracy, D. P., Pencek, R. R., Graham, T. E., & Wasserman, D. H. (2003). Quinides of Roasted Coffee Enhance Insulin Action in Conscious Rats. Journal of Nutrition, 133(11), 3529–3532. https://doi.org/10.1093/jn/133.11.3529
- Johnston, K. L., Clifford, M. N., & Morgan, L. M. (2003). Coffee acutely modifies gastrointestinal hormone secretion and glucose tolerance in humans: Glycemic effects of chlorogenic acid and caffeine. American Journal of Clinical Nutrition, 78(4), 728–733. https://doi.org/10.1093/ajcn/78.4.728
- Wachman, A., Hattner, R. S., George, B., & Bernstein, D. S. (1970). Effects of decaffeinated and nondecaffeinated coffee ingestion on blood glucose and plasma radioimmunoreactive insulin responses to rapid intravenous infusion of glucose in normal man. Metabolism, 19(7), 539–546. https://doi.org/10.1016/0026-0495(70)90009-0
- Zhang, Y., Lee, E. T., Cowan, L. D., Fabsitz, R. R., & Howard, B. V. (2011). Coffee consumption and the incidence of type 2 diabetes in men and women with normal glucose tolerance: The Strong Heart Study. Nutrition, Metabolism and Cardiovascular Diseases, 21(6), 418–423. https://doi.org/10.1016/j.numecd.2009.10.020
- Van Dieren, S., Uiterwaal, C. S. P. M., Van Der Schouw, Y. T., Van Der A, D. L., Boer, J. M. A., Spijkerman, A., Grobbee, D. E., & Beulens, J. W. J. (2009). Coffee and tea consumption and risk of type 2 diabetes. Diabetologia, 52(12), 2561–2569. https://doi.org/10.1007/s00125-009-1516-3
- Odegaard, A. O., Pereira, M. A., Koh, W. P., Arakawa, K., Lee, H. P., & Yu, M. C. (2008). Coffee, tea, and incident type 2 diabetes: The Singapore Chinese Health Study. American Journal of Clinical Nutrition, 88(4), 979–985. https://doi.org/10.1093/ajcn/88.4.979
- Wiles, J. D., Bird, S. R., Hopkins, J., & Riley, M. (1992). Effect of caffeinated coffee on running speed, respiratory factors, blood lactate and perceived exertion during 1500-m treadmill running. British Journal of Sports Medicine, 26(2), 116–120. https://doi.org/10.1136/bjsm.26.2.116
- LeBlanc, J., Jobin, M., Cote, J., Samson, P., & Labrie, A. (1985). Enhanced metabolic response to caffeine in exercise-trained human subjects. Journal of Applied Physiology, 59(3), 832–837. https://doi.org/10.1152/jappl.19188.8.131.522
- Astrup, A., Toubro, S., Cannon, S., Hein, P., Breum, L., & Madsen, J. (1990). Caffeine: A double-blind, placebo-controlled study of its thermogenic, metabolic, and cardiovascular effects in healthy volunteers. American Journal of Clinical Nutrition, 51(5), 759–767. https://doi.org/10.1093/ajcn/51.5.759
- Mora-Rodríguez, R., Pallarés, J. G., López-Samanes, Á., Ortega, J. F., & Fernández-Elías, V. E. (2012). Caffeine ingestion reverses the circadian rhythm effects on neuromuscular performance in highly resistance-trained men. PLoS ONE, 7(4). https://doi.org/10.1371/journal.pone.0033807
- Beck, T. W., Housh, T. J., Schmidt, R. J., Johnson, G. O., Housh, D. J., Coburn, J. W., & Malek, M. H. (2006). The acute effects of a caffeine-containing supplement on strength, muscular endurance, and anaerobic capabilities. Journal of Strength and Conditioning Research, 20(3), 506–510. https://doi.org/10.1519/18285.1
- Astorino, T. A., Rohmann, R. L., & Firth, K. (2008). Effect of caffeine ingestion on one-repetition maximum muscular strength. European Journal of Applied Physiology, 102(2), 127–132. https://doi.org/10.1007/s00421-007-0557-x
- I Kawachi, W C Willett, G A Colditz, M J Stampfer, & F E Speizer. (n.d.). A prospective study of coffee drinking and suicide in women - PubMed. Retrieved April 30, 2021, from https://pubmed.ncbi.nlm.nih.gov/8604958/
- Lucas, M., Mirzaei, F., Pan, A., Okereke, O. I., Willett, W. C., O’Reilly, É. J., Koenen, K., & Ascherio, A. (2011). Coffee,,caffeine,and risk of depression among women. Archives of Internal Medicine, 171(17), 1571–1578. https://doi.org/10.1001/archinternmed.2011.393
- Lopez-Garcia, E., Van Dam, R. M., Li, T. Y., Rodriguez-Artalejo, F., & Hu, F. B. (2008). The relationship of coffee consumption with mortality. Annals of Internal Medicine, 148(12), 904–914. https://doi.org/10.7326/0003-4819-148-12-200806170-00003
- Tamakoshi, A., Lin, Y., Kawado, M., Yagyu, K., Kikuchi, S., & Iso, H. (2011). Effect of coffee consumption on all-cause and total cancer mortality: Findings from the JACC study. European Journal of Epidemiology, 26(4), 285–293. https://doi.org/10.1007/s10654-011-9548-7
- Freedman, N. D., Park, Y., Abnet, C. C., Hollenbeck, A. R., & Sinha, R. (2012). Association of Coffee Drinking with Total and Cause-Specific Mortality. New England Journal of Medicine, 366(20), 1891–1904. https://doi.org/10.1056/NEJMoa1112010
- Pulido, R., Hernñndez-García, M., & Saura-Calixto, F. (2003). Contribution of beverages to the intake of lipophilic and hydrophilic antioxidants in the Spanish diet. European Journal of Clinical Nutrition, 57(10), 1275–1282. https://doi.org/10.1038/sj.ejcn.1601685