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Caffeine comes from plant sources, and drinks like tea and coffee contain the substance naturally, but it is still a drug that acts physically on your body. Caffeine is best known as a way to wake up, stay awake and get fast energy. Those effects happen because of how the drug works on your nervous system. Your body processes and expels caffeine rather than allowing it to build up.
You feel caffeine's effects rapidly because it starts working on your nervous system in about five minutes and peaks in half an hour, the Centre for Addiction and Mental Health advises. Your body does not store the chemical, and its effects normally last for about four to six hours as it gets processes and eliminated. The effects wear off overnight, even if you consume large amounts of caffeine during the day. Heavy caffeine users often suffer from physical and mental withdrawal symptoms when they first wake up, although drinking coffee or tea or taking caffeine in some other form stops the symptoms.
- You feel caffeine's effects rapidly because it starts working on your nervous system in about five minutes and peaks in half an hour, the Centre for Addiction and Mental Health advises.
- Heavy caffeine users often suffer from physical and mental withdrawal symptoms when they first wake up, although drinking coffee or tea or taking caffeine in some other form stops the symptoms.
Calming Effects of Caffeine
Caffeine has several effects on your body before it leaves your system. Most people feel more alert after consuming it, are able to stay awake and are more mentally alert. Some people are more sensitive to those effects, especially physically smaller individuals. You get desensitized to the drug's effects if you consume it regularly in large amounts. For most people, that means more than 300 mg every day, according to MayoClinic.com. This requires you to use more caffeine to get the same energizing effects as you used to with a more modest amount.
- Caffeine has several effects on your body before it leaves your system.
- This requires you to use more caffeine to get the same energizing effects as you used to with a more modest amount.
Caffeine withdrawal takes up to nine days to run its course, according to Johns Hopkins Medicine 3. Once caffeine is cleared out of a heavy user's body, flu-like symptoms, headache and other body soreness, crankiness and an upset stomach kick in. These effects reach their worst point within one to two days, lessening over the next seven to eight days until they disappear completely. You restart the cycle if you start using caffeine again. Minimize symptoms or prevent them completely by tapering off your caffeine consumption for several days until you are no longer consuming it at all. Use herbal teas and decaffeinated coffee to fulfill your taste for your usual caffeinated beverages.
- Caffeine withdrawal takes up to nine days to run its course, according to Johns Hopkins Medicine 3.
- You restart the cycle if you start using caffeine again.
Quitting Caffeine & an Increased Pulse Rate
Coffee, tea, cola beverages and chocolate are commonly known as caffeine sources, and many energy drink makers add it to their products for its boost. The chemical also has lesser-known sources, like certain cold, flu and pain drugs. Read the ingredients list for over-the-counter pain pills and cold and flu remedies if you are controlling your caffeine intake. Caffeine-free options are available if you want to avoid the drug,
- Coffee, tea, cola beverages and chocolate are commonly known as caffeine sources, and many energy drink makers add it to their products for its boost.
Calming Effects of Caffeine
Quitting Caffeine & an Increased Pulse Rate
Side Effects of Caffeine Withdrawal
The Harmful Effects of Caffeine on Teenagers
What Causes a Person to Crash After Drinking Caffeine?
How Do Caffeine Tablets Affect Your Body?
Negative Effects From Drug Abuse
Can Too Much Caffeine Give You a Heart Attack?
Side Effects of Quitting Smoking Marijuana
The Effects of Caffeine on the Bladder
- TeensHealth; Caffeine; January 2008
- MayoClinic.com; Caffeine: How Much is Too Much?; March 2011
- Johns Hopkins Medicine; Caffeine Withdrawal Recognized as a Disorder; September 2004
- Meredith SE, Juliano LM, Hughes JR, Griffiths RR. Caffeine Use Disorder: A Comprehensive Review and Research Agenda. J Caffeine Res. 2013;3(3):114-130. doi:10.1089/jcr.2013.0016
- Richards G, Smith AP. A Review of Energy Drinks and Mental Health, with a Focus on Stress, Anxiety, and Depression. J Caffeine Res. 2016;6(2):49-63. doi:10.1089/jcr.2015.0033
- Brunyé TT, Mahoney CR, Rapp DN, Ditman T, Taylor HA. Caffeine enhances real-world language processing: evidence from a proofreading task. J Exp Psychol Appl. 2012;18(1):95-108. doi:10.1037/a0025851
- Koppelstaetter F, Poeppel TD, Siedentopf CM, et al. Caffeine and cognition in functional magnetic resonance imaging. J Alzheimers Dis. 2010;20 Suppl 1:S71-84. doi:10.3233/JAD-2010-1417
- Harrell PT, Juliano LM. Caffeine expectancies influence the subjective and behavioral effects of caffeine. Psychopharmacology (Berl). 2009;207(2):335-42. doi:10.1007/s00213-009-1658-5
- Lucas M, O'reilly EJ, Pan A, et al. Coffee, caffeine, and risk of completed suicide: results from three prospective cohorts of American adults. World J Biol Psychiatry. 2014;15(5):377-86. doi:10.3109/15622975.2013.795243
- Abdel-Hady H, Nasef N, Shabaan AE, Nour I. Caffeine therapy in preterm infants. World J Clin Pediatr. 2015;4(4):81-93. doi:10.5409/wjcp.v4.i4.81
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th edition. Washington DC; 2013.
- Turnbull D, Rodricks JV, Mariano GF, Chowdhury F. Caffeine and cardiovascular health. Regul Toxicol Pharmacol. 2017;89:165-185. doi:10.1016/j.yrtph.2017.07.025
- Centers for Disease Control and Prevention. Alcohol and Caffeine. Updated October 23, 2018.
- Alsunni AA. Energy Drink Consumption: Beneficial and Adverse Health Effects. Int J Health Sci (Qassim). 2015;9(4):468-474.
- Lyngsø J, Ramlau-Hansen CH, Bay B, Ingerslev HJ, Hulman A, Kesmodel US. Association between coffee or caffeine consumption and fecundity and fertility: a systematic review and dose-response meta-analysis. Clin Epidemiol. 2017;9:699-719. doi:10.2147/CLEP.S146496
- U.S. Food and Drug Administration. Pure and Highly Concentrated Caffeine. Updated September 21, 2018.
- National Institute on Drug Abuse. Drugs, Brains, and Behavior: The Science of Addiction. Updated July 2018.
Based in Kissimmee, Fla., Barb Nefer is a freelance writer with over 20 years of experience. She is a mental health counselor, finance coach and travel agency owner. Her work has appeared in such magazines as "The Writer" and "Grit" and she authored the book, "So You Want to Be a Counselor."