Coffee: The Original Wonder Drug?
July 24, 2012
Mental and Medical Benefits of Coffee:
Introduction
The best part of waking up...is reducing your risk of neurodegeneration. And depression, and cancer, and cardiovascular disease... It's becoming increasingly clear that coffee is more than just a morning routine. The body of data suggesting that the world's most widely used stimulant is beneficial in a variety of mental and medical conditions is growing at a staggering rate. A recent study published in the New England Journal of Medicinefound that coffee consumption lowered all-cause mortality by over 10% at 13-year follow-up.[1] Based primarily on recent Medscape Medical News coverage, the following slideshow reviews the potential medical and psychiatric benefits of coffee consumption.
Cardiovascular Disease
It may seem counterintuitive: A substance known to increase blood pressure might actually be good for your cardiovascular system. Caffeine consumption can cause a short-lived increase in blood pressure – a major risk factor for cardiovascular disease (CVD) – and regular use has been linked to a longer-term increase. However, when caffeine is ingested via coffee, enduring blood pressure elevations are small and CVD risks may be balanced by protective properties. Coffee beans contain antioxidant compounds that reduce oxidation of low-density lipoprotein (LDL) cholesterol and coffee consumption has been associated with reduced concentrations of inflammatory markers.[2-7] Moderate coffee intake was associated with a lower risk for coronary heart disease as far out as 10 years,[3] and new data suggest that an average of 2 cups a day protects against heart failure.[8]
Cerebrovascular Disease and Stroke
The vascular benefits of coffee are not lost on the brain. According to a 2011 meta-analysis, consuming between 1 and 6 cups a day reportedly cut stroke risk by 17%.[9] A 22% to 25% risk reduction was seen in a large sample of Swedish women followed for an average of 10 years.[10] And while coffee's impact on stroke risk in those with CVD is still in question, a meta-analysis presented at the European Meeting on Hypertension 2012 found that 1 to 3 cups a day may protect against ischemic stroke in the general population.[11]
Diabetes and Weight Loss
Despite coffee's association with increased blood pressure, the steamy brew appears to benefit other aspects of so-called “metabolic syndrome,” the dangerous cluster of hypertension, hyperglycemia, abnormal lipid levels, and increased body fat. Numerous studies have linked regular coffee drinking with improved glucose metabolism, insulin secretion, and a significantly reduced risk for type 2 diabetes.[12-14] Preliminary data from an ongoing study also suggest that coffee consumption can promote weight loss. Overweight patients treated with unroasted coffee beans in supplement form lost an average of 17 pounds over 22 weeks. The study authors suspect that this effect may be due in part to coffee containing chlorogenic acid, a plant compound with antioxidant properties thought to reduce glucose absorption.[15]
Cancer
With so many ingestibles thought to increase cancer risk – soda, grilled meat, all things pickled – at least we can rest easy when it comes to coffee (according to recent data, anyway). Evidence suggests that moderate to heavy coffee consumption can reduce the risk for numerous cancers, including endometrial (> 4 cups/day),[16]prostate (6 cups/day),[17] head and neck (4 cups/day),[18,19] basal cell carcinoma (> 3 cups/day),[20] and estrogen receptor-negativebreast cancer (> 5 cups/day).[21] The benefits are thought to be at least partially due to coffee's antioxidant and antimutagenic properties.[16,18]
Neurodegeneration
It's clear that coffee temporarily affects cognition – try getting through morning rounds without a cup. But new research also links coffee with more enduring effects on cognitive well-being. A studypublished in the Journal of Alzheimer's Disease showed that patients with mild cognitive impairment and plasma caffeine levels of > 1200 ng/mL – courtesy of ~3 to 5 cups of coffee a day – avoided progression to dementia over the following 2 to 4 years. [22]Corresponding studies in mice suggest that caffeine suppresses enzymes involved in amyloid-beta production, while coffee consumption boosts G-CSF, interleukin-10, and interleukin-6 levels, cytokines thought to contribute to the reported benefits. Caffeinated coffee has long been thought to be neuroprotective in Parkinson disease (PD), and recent work found that variants in the glutamate-receptor gene GRIN2A affect PD risk in coffee drinkers.[23]Furthermore, data presented at this year's American Academy of Neurology Annual Meeting showed that 3 cups of coffee a day may prevent the formation of Lewy bodies, a signature preclinical pathologic finding in PD.[24] Despite the encouraging associations in neurodegenerative disease, caffeine intake has also been associated with accelerating age of onset of Huntington disease.[25]
Depression
A 2011 study suggests that a boost in coffee consumption might also benefit our mental health[26]: Women who drank 2 to 3 cups of coffee per day had a 15% decreased risk for depression compared with those who drank less than 1 cup per week. A 20% decreased risk was seen in those who drank 4 cups or more per day. The short-term effect of coffee on mood may be due to altered serotonin and dopamine activity, whereas the mechanisms behind its potential long-term effects on mood may relate to its antioxidant and anti-inflammatory properties, factors that are thought to play a role in depressive illnesses.[26-29]
Liver Disease
The liver might help break down coffee, but coffee might protect the liver (in some cases). Evidence suggests that coffee consumption slows disease progression in patients with alcoholic cirrhosis and hepatitis C and reduces the risk of developing hepatocellular carcinoma.[30-33] A 2012 study reported that coffee intake is associated with a lower risk for nonalcoholic fatty liver disease (NAFLD),[34] while other recent work found that coffee protects against liver fibrosis in those with already established NAFLD.[32]
But That's Not All...
A grab-bag of other research suggests that coffee intake may relieve dry-eye syndrome by increasing tear production,[35] reduce the risk for gout,[36] and potentially fight infection.[37] Coffee and hot tea consumption were found to be protective against one of the medical community's most concerning bugs, methicillin-resistantStaphylococcus aureus (MRSA).[37] While it remains unclear whether the beverages have systemic antimicrobial activity, study participants who reported any consumption of either were approximately half as likely to have MRSA in their nasal passages.
And Finally, the Risks
As is often the case, with the benefits come the risks, and coffee consumption certainly has negative medical and psychiatric effects to consider. Besides the aforementioned potential increase in blood pressure, coffee can incite or worsen anxiety, insomnia, and tremor and potentially elevate glaucoma risk.[38] Also, given the potential severity of symptoms, caffeine withdrawal syndrome is under consideration for inclusion in the forthcoming DSM-5.[39]
Additional research is necessary to better assess and balance the potential benefits and drawbacks of coffee consumption. But mounting evidence suggests that going back for a second cup might not necessarily be a bad decision.
References
1. Freedman ND, Park Y, Abnet CC, et al. Association of coffee drinking with total and cause-specific mortality. N Engl J Med. 2012;366:1891-1904. Abstract
2. Larsson SC, Orsini N. Coffee consumption and risk of stroke: a dose-response meta-analysis of prospective studies. Am J Epidemiol. 2011;174:993-1001. Abstract
3. Wu JN, Ho SC, Zhou C, et al. Coffee consumption and risk of coronary heart diseases: a meta-analysis of 21 prospective cohort studies. Int J Cardiol. 2009;137:216-225. Abstract
4. Natella F, Nardini M, Belelli F, et al. Coffee drinking induces incorporation of phenolic acids into LDL and increases the resistance of LDL to ex vivo oxidation in humans. Am J Clin Nutr. 2007;86:604-609. Abstract
5. Gómez-Ruiz JA, Leake DS, Ames JM. In vitro antioxidant activity of coffee compounds and their metabolites. J Agric Food Chem. 2007;55:6962-6969. Abstract
6. Nardini M, D'Aquino M, Tomassi G, et al. Inhibition of human low-density lipoprotein oxidation by caffeic acid and other hydroxycinnamic acid derivatives. Free Radic Biol Med. 1995;19:541-552. Abstract
7. Montagnana M, Favaloro EJ, Lippi G. Coffee intake and cardiovascular disease: virtue does not take center stage. Semin Thromb Hemost. 2012;38:164-177. Abstract
8. Mostofsky E, Rice MS, Levitan EB, Mittleman MA. Habitual coffee consumption and risk of heart failure: a doseresponse meta-analysis. Circ Heart Fail. 2012;DOI:10.1161/CIRCHEARTFAILURE.112.967299. http://circheartfailure.ahajournals.org
9. Larsson SC, Orsini N. Coffee consumption and risk of stroke: a dose-response meta-analysis of prospective studies. Am J Epidemiol. 2011;174:993-1001. Abstract
10. Larsson SC, Virtamo J, Wolk A. Coffee consumption and risk of stroke in women. Stroke. 2011;42:908-912. Abstract
11. D'Elia L, Cairella G, Garbagnati F, et al. Moderate coffee consumption is associated with lower risk of stroke: meta-analysis of prospective studies. J Hypertension. 2012;30 (e-Supplement A):e107.
12. Huxley R, Lee CM, Barzi F, et al. Coffee, decaffeinated coffee, and tea consumption in relation to incident type 2 diabetes mellitus: a systematic review with meta-analysis. Arch Intern Med. 2009;169:2053-2063. Abstract
13. Sartorelli DS, Fagherazzi G, Balkau B, et al. Differential effects of coffee on the risk of type 2 diabetes according to meal consumption in a French cohort of women: the E3N/EPIC cohort study. Am J Clin Nutr. 2010;91:1002-112.Abstract
14. Floegel A, Pischon T, Bermann MM, et al. Coffee consumption and risk of chronic disease in the European Prospective Investigation into Cancer and Nutrition (EPIC)Germany study. Am J Clin Nutr. 2012;95:901-908. Abstract
15. Vinson JA, Burnham B, Nagendran MV, et al. Randomized double-blind placebo-controlled crossover study to evaluate the efficacy and safety of a green coffee bean extract in overweight subjects. Program and abstracts of the 243rd American Chemical Society National Meeting and Exposition; March 25-29, 2012; San Diego, California. Abstract 92.
16. Je Y, Hankison SE, Tworoger SS, et al. A prospective cohort study of coffee consumption and risk of endometrial cancer over a 26-year follow-up. Cancer Epidemiol Biomarkers Prev. 2011;20:1-9.
17. Wilson KM, Kasperzyk JL, Rider JR, et al. Coffee consumption and prostate cancer risk and progression in the Health Professionals Follow-up Study. J Natl Cancer Inst. 2011;8;103:876-884.
18. Turati F, Galeone C, La Vecchia C, et al. Coffee and cancers of the upper digestive and respiratory tracts: meta-analyses of observational studies. Ann Oncol. 2011;22:536-544. Abstract
19. Galeone C, Tavani A, Pelucchi C, et al. Coffee and tea intake and risk of head and neck cancer: pooled analysis in the international head and neck cancer epidemiology consortium. Cancer Epidemiol Biomarkers Prev. 2010;19:1723-1736. Abstract
20. Song F, Qureshi AA, Han J. Increased caffeine intake is associated with reduced risk of Basal cell carcinoma of the skin. Cancer Res. 2012;72:3282-3289. Abstract
21. Li J, Seibold P, Chang-Claude J, et al. Coffee consumption modifies risk of estrogen-receptor negative breast cancer. Breast Cancer Res. 2011;13:R49.
22. Cao C, Loewenstein DA, Lin X, et al. High blood caffeine levels in MCI linked to lack of progression to dementia. J Alzheimer Dis. 2012;30:559-572.
23. Hamza TH, Chen H, Hill-Burns EM, et al. Genome-wide gene-environment study identifies glutamate receptor gene GRIN2A as a Parkinson's disease modifier gene via interaction with coffee. PLoS Genet. 2011;7: e1002237.
24. Ross W, Duda J, Abbott R, et al. Association of coffee caffeine consumption with brain Lewy pathology in the Honolulu-Asia Aging Study. Program and abstracts of the 64th Annual Meeting of the American Academy of Neurology; April 21-28, 2012; New Orleans, Louisiana. Abstract #S42.005.
25. Duru C. Caffeine is a modifier of age at onset in Huntington's disease. Program and abstracts of the 15th International Congress of Parkinson's Disease and Movement Disorders; June 5-9, 2011; Toronto, Ontario, Canada. Abstract 180.
26. Lucas M, Mirzaei F, Pan A, et al. Coffee, caffeine, and risk of depression among women. Arch Intern Med. 2011;171:1571-1578. Abstract
27. Pasco JA, Nicholson GC, Williams LJ, et al. Association of high-sensitivity C-reactive protein with de novo major depression. Br J Psychiatry. 2010;197:372-377. Abstract
28. Ng F, Berk M, Dean O, Bush AI. Oxidative stress in psychiatric disorders: evidence base and therapeutic implications. Int J Neuropsychopharmacol. 2008;11:851-876. Abstract
29. O'Connor A. Coffee drinking linked to less depression in women. New York Times. February 13, 2012. http://well.blogs.nytimes.com/2011/09/26/coffee-drinking-linked-to-less-depression-in-women/ Accessed January 11, 2012.
30. Molloy JW, Calcagno CJ, Williams CD, Jones FJ, Torres DM, Harrison SA. Association of coffee and caffeine consumption with fatty liver disease, nonalcoholic steatohepatitis, and degree of hepatic fibrosis. Hepatology. 2012;55:429-436. Abstract
31. Gallus S, Tavani A, Negri E, La Vecchia C. Does coffee protect against liver cirrhosis? Ann Epidemiol. 2002;12:202-205.
32. Molloy JW, Calcagno CJ, Williams CD, et al. Association of coffee and caffeine consumption with fatty liver disease, nonalcoholic steatohepatitis, and degree of hepatic fibrosis. Hepatology. 2012;55:429-436. Abstract
33. Modi AA, Feld JJ, Park Y, et al. Increased caffeine consumption is associated with reduced hepatic fibrosis. Hepatology. 2010;51:201-209. Abstract
34. Birerdinc A, Stepanova M, Pawloski L, Younossi M. Caffeine is protective in patients with non-alcoholic fatty liver disease. Aliment Pharmacol Ther. 2012;3576-82.
35. Arita R, Yanagi Y, Honda N, Maeda S, et al. Caffeine increases tear volume depending on polymorphisms within the adenosine A2a receptor gene and cytochrome P450 1A2. Ophthalmology. 2012;119:972-978. Abstract
36. Choi HK, Willett W, Curhan G. Coffee consumption and risk of incident gout in men: A prospective study. Arthritis Rheum. 2007;56:2049-2055. Abstract
37. Matheson EM, Mainous AG, Everett CJ, King DE. Tea and coffee consumption and MRSA nasal carriage. Ann Fam Med. 2011;9:299-304. Abstract
38. Pasquale L. Program and abstracts of the American Glaucoma Society 22nd Annual Meeting; March 1-4, 2012; New York, New York. Abstracts 23 and 83.
39. Compton WM, Budney AJ, Hasin D. New approaches to substance and related diagnoses in the DSM-5. Program and abstracts of the American Academy of Addiction Psychiatry (AAAP) 22nd Annual Meeting and Symposium; December 8-11, 2011; Scottsdale, Arizona. Workshop B2. Presented December 9, 2011.
Author
Bret Stetka, MD, Editorial Director, Medscape from WebMD
Reviewers
Henry R. Black, MD, Clinical Professor of Internal Medicine; Director, Hypertension Research, Center for the Prevention of Cardiovascular Disease, New York University School of Medicine, New York, New York