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URLhttps://www.eatthis.com/ugly-side-effects-drinking-too-much-coffee/
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Meta TitleUgly Side Effects of Drinking Too Much Coffee, According to Science — Eat This Not That
Meta DescriptionWhile having a little caffeine can cause a lower risk of death according to the AARP, drinking too much coffee can have negative side effects.
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How much is too much? We have the answer. Let’s just get down to it. How much coffee is considered too much coffee? Surprisingly, you can drink a lot of coffee during the week. It’s actually recommended that people stick to no more than 28 cups of coffee a week, which is about four cups of coffee a day . However, drinking more of that can cause negative effects on one’s health—particularly their lifespan . One study evaluating 40,000 adults found that drinking more than the average four cups of coffee a day did cause ugly side effects on their bodies. A recent study from the European Society of Cardiology discovered that the sweet spot was two to three cups a day. Plus, it noted that all types of coffee—ground, instant, and decaf—have positive effects that can extend your life . If you’re one to consume more than 32 ounces of coffee a day or love to down sugary lattes from your local coffee chain, it may be wise to evaluate these ugly side effects if you’re drinking too much coffee. Because while having a little caffeine can cause a lower risk of death according to the AARP , drinking too much of it can create negative side effects to one’s health. Here are the ugly side effects to expect if you’re drinking too much coffee, according to research. You feel anxious. Shutterstock A typical eight-ounce cup of coffee has 95 milligrams of caffeine in it. So if you were to drink over four cups of coffee, you would hit around 500 milligrams of caffeine in a day. One study by the Journal of Psychopharmacology reports that being a high consumer of caffeine on this type of level can cause high levels of stress, anxiety, and even depression. The study says that consuming more than 1,000 milligrams of caffeine a week even showed to be a predictor of high anxiety. While anxiety and stress are good things to talk over with a medical professional—especially in terms of your mental health —it’s also important to evaluate your caffeine intake with that professional and discuss better caffeine habits moving forward. Here are the Side Effects of Drinking Caffeine, According to Science . You’re not getting good sleep. Shutterstock Regularly consuming coffee can cause issues with your normal sleep patterns, especially if you’re enjoying a pick-me-up cup in the afternoon. One study evaluated 197 high school students, a mixed amount of users with moderate caffeine intake reported early morning awakening and daytime sleepiness compared to a group that drank lower amounts of caffeine. While there are a lot of health benefits to drinking coffee on the regular, keeping your daily coffee intake to a minimum—and in the morning—can help with your sleep patterns at night. Here are 7 Healthy Diet Changes That Help You Sleep . Your heart rate is increasing. Shutterstock Although one controlled study showed that drinking 100 milligrams of caffeine between every hour to five hours did not cause increased heart rates, drinking a significant amount can lead to an altered heartbeat rhythm. But it would take a significant amount of caffeine intake to do so. You have the jitters. Shutterstock Ever experience the shakes after too many cups of coffee? This can actually be defined as a caffeine overdose, which Healthline states can cause headaches, jitters, difficulty sleeping, and as we already mentioned, an increased heart rate. If you’re experiencing any of these severe ugly side effects you’re drinking too much coffee, you should seek medical attention. You’re feeling fatigued. Shutterstock It’s natural to turn to coffee—or other forms of caffeine—when you’re feeling tired. But did you know consuming too much caffeine can actually have a negative effect? Especially if it includes added sugars . In a study published by Innovations in Clinical Neuroscience , where participants were given certain amounts of caffeinated beverages for energy, drinking caffeinated beverages—especially with sugar—on a regular basis did cause mental fatigue for participants. While this is common for caffeine to cause decreased energy levels as it wears off, it’s best to time it for when you plan on sleeping—instead of turning to more coffee to keep you awake. Because disrupted sleep later will cause even more fatigue throughout the day, creating a vicious cycle. A previous version of this article was originally published on January 22, 2021. Kiersten Hickman Kiersten Hickman is a freelance health and nutrition journalist. Read more about Kiersten
Markdown
[Skip to content](https://www.eatthis.com/ugly-side-effects-drinking-too-much-coffee/#main-content) - [News](https://www.eatthis.com/tag/news/) - [Healthy Eating](https://www.eatthis.com/healthy-eating/) - [Groceries](https://www.eatthis.com/supermarkets/) - [Weight Loss](https://www.eatthis.com/weight-loss/) - [Restaurants](https://www.eatthis.com/restaurants/) - [Recipes](https://www.eatthis.com/recipes/) - [Drinks](https://www.eatthis.com/drink-this-not-that/) - [Mind + Body](https://www.eatthis.com/mind-body/) - [The Books](https://www.galvanizedbooks.com/) - [The Newsletter](https://www.eatthis.com/newsletters/) - [About Us](https://www.eatthis.com/about-eat-this-not-that/) - [Contact](https://www.eatthis.com/contact-us/) ### Follow us: - [Facebook](https://www.facebook.com/pages/Eat-This-Not-That/123452516277 "Facebook") - [Instagram](https://www.instagram.com/eatthisnotthat/ "Instagram") - [TikTok](https://www.tiktok.com/@_eatthisnotthat "TikTok") - [Pinterest](https://www.pinterest.com/eatthisnotthat/ "Pinterest") - [News](https://www.eatthis.com/tag/news/) - [Healthy Eating](https://www.eatthis.com/healthy-eating/) - [Groceries](https://www.eatthis.com/supermarkets/) - [Weight Loss](https://www.eatthis.com/weight-loss/) - [Restaurants](https://www.eatthis.com/restaurants/) - [Recipes](https://www.eatthis.com/recipes/) - [Drinks](https://www.eatthis.com/drink-this-not-that/) - [Mind + Body](https://www.eatthis.com/mind-body/) - [The Books](https://www.galvanizedbooks.com/) - [The Newsletter](https://www.eatthis.com/newsletters/) - [About Us](https://www.eatthis.com/about-eat-this-not-that/) - [Contact](https://www.eatthis.com/contact-us/) ### Follow us: - [Facebook](https://www.facebook.com/pages/Eat-This-Not-That/123452516277 "Facebook") - [Instagram](https://www.instagram.com/eatthisnotthat/ "Instagram") - [TikTok](https://www.tiktok.com/@_eatthisnotthat "TikTok") - [Pinterest](https://www.pinterest.com/eatthisnotthat/ "Pinterest") × This content references scientific studies and academic research, and is fact-checked to ensure accuracy. [Our team](https://www.eatthis.com/expert-advisors/) of licensed nutritionists and dietitians strives to be objective, unbiased, and honest. We are committed to bringing you researched, expert-driven content to help you make more informed decisions around food, health, and wellness. We know how important making choices about your overall health is, and we strive to provide you with the best information possible. [Home](https://www.eatthis.com/) / [Healthy Eating](https://www.eatthis.com/healthy-eating/) / Ugly Side Effects of Drinking Too Much Coffee, According to Science # Ugly Side Effects of Drinking Too Much Coffee, According to Science ![older couples hands holding mugs of coffee, autumn](https://www.eatthis.com/wp-content/uploads/sites/4/2022/10/older-hands-couple-coffee.jpg?quality=82&strip=1) Shutterstock Evidence-Based How much is too much? We have the answer. [![Avatar for Kiersten Hickman](https://www.eatthis.com/wp-content/uploads/sites/4/2019/09/kiersten-hickman-eat-this-not-that-senior-editor.jpg?quality=82&strip=all&w=96)](https://www.eatthis.com/author/kiersten-hickman/) By [Kiersten Hickman](https://www.eatthis.com/author/kiersten-hickman/ "Posts by Kiersten Hickman") October 5, 2022 Let’s just get down to it. How much coffee is considered too much coffee? Surprisingly, you can drink a lot of coffee during the week. It’s actually recommended that people stick to no more than 28 cups of coffee a week, which is about [four cups of coffee a day](https://www.eatthis.com/drinking-this-much-coffee-is-bad/). However, drinking more of that can cause negative effects on one’s health—particularly [their lifespan](https://www.eatthis.com/coffee-habits-shortening-your-life/). [One study](https://www.webmd.com/healthy-aging/news/20130815/heavy-coffee-drinking-tied-to-shorter-lives-for-younger-adults-in-study#1) evaluating 40,000 adults found that drinking more than the average four cups of coffee a day did cause ugly side effects on their bodies. A recent study from the European Society of Cardiology discovered that the sweet spot was two to three cups a day. Plus, it noted that all types of coffee—ground, instant, and decaf—have positive effects that [can extend your life](https://www.eatthis.com/daily-coffee-habit-extend-your-life/). If you’re one to consume more than 32 ounces of coffee a day or love to down sugary lattes from your local coffee chain, it may be wise to evaluate these ugly side effects if you’re drinking too much coffee. Because while having a little [caffeine](https://www.eatthis.com/news-side-effects-drinking-caffeine-science/) can cause a lower risk of death according to the [AARP](https://www.aarp.org/health/healthy-living/info-2018/coffee-longevity-health-benefits.html), drinking too much of it can create negative side effects to one’s health. Here are the ugly side effects to expect if you’re drinking too much coffee, according to research. ## You feel anxious. ![older couples hands holding mugs of coffee, autumn](https://www.eatthis.com/wp-content/uploads/sites/4/2022/10/older-hands-couple-coffee.jpg?quality=82&strip=all&w=640) ![older couples hands holding mugs of coffee, autumn](https://www.eatthis.com/wp-content/uploads/sites/4/2022/10/older-hands-couple-coffee.jpg?quality=82&strip=all&w=640) Shutterstock A typical eight-ounce cup of coffee has 95 milligrams of caffeine in it. So if you were to drink over four cups of coffee, you would hit around 500 milligrams of caffeine in a day. One study by the *[Journal of Psychopharmacology](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4668773/)* reports that being a high consumer of caffeine on this type of level can cause high levels of stress, anxiety, and even depression. The study says that consuming more than 1,000 milligrams of caffeine a week even showed to be a predictor of high anxiety.6254a4d1642c605c54bf1cab17d50f1e While anxiety and stress are good things to talk over with a medical professional—especially in terms of your [mental health](https://www.eatthis.com/improve-mental-health/)—it’s also important to evaluate your caffeine intake with that professional and discuss better caffeine habits moving forward. Here are the [Side Effects of Drinking Caffeine, According to Science](https://www.eatthis.com/news-side-effects-drinking-caffeine-science/). [![Eat this, not that](https://www.eatthis.com/wp-content/themes/eatthis/img/etnt-logo.png)![Eat this, not that](https://www.eatthis.com/wp-content/themes/eatthis/img/etnt-logo.png)](https://www.eatthis.com/ "Eat This Not That") ## Sign up for our newsletter\! ## You’re not getting good sleep. ![woman drinking coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2022/08/woman-drinking-coffee.jpg?quality=82&strip=all&w=640) ![woman drinking coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2022/08/woman-drinking-coffee.jpg?quality=82&strip=all&w=640) Shutterstock Regularly consuming coffee can cause issues with your normal sleep patterns, especially if you’re enjoying a pick-me-up cup in the afternoon. [One study](https://pubmed.ncbi.nlm.nih.gov/19858312/) evaluated 197 high school students, a mixed amount of users with moderate caffeine intake reported early morning awakening and daytime sleepiness compared to a group that drank lower amounts of caffeine. While there are a lot of health benefits to drinking coffee on the regular, keeping your daily coffee intake to a minimum—and in the morning—can help with your [sleep](https://www.eatthis.com/lose-weight-in-sleep/) patterns at night. Here are [7 Healthy Diet Changes That Help You Sleep](https://www.eatthis.com/healthy-diet-changes-help-you-sleep/). ## Your heart rate is increasing. ![Barista small coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2018/09/barista-small-coffee.jpg) ![Barista small coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2018/09/barista-small-coffee.jpg) Shutterstock Although [one controlled study](https://www.ncbi.nlm.nih.gov/pubmed/27749954) showed that drinking 100 milligrams of caffeine between every hour to five hours did not cause increased heart rates, [drinking a significant amount](https://www.ncbi.nlm.nih.gov/pubmed/28527645) can lead to an altered heartbeat rhythm. But it would take a significant amount of caffeine intake to do so. ## You have the jitters. ![large coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2022/03/large-coffee.jpg?quality=82&strip=all&w=640) ![large coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2022/03/large-coffee.jpg?quality=82&strip=all&w=640) Shutterstock Ever experience the shakes after too many cups of coffee? This can actually be defined as a caffeine overdose, which [Healthline](https://www.healthline.com/nutrition/how-to-get-caffeine-out-of-your-system#health-risks) states can cause headaches, jitters, difficulty sleeping, and as we already mentioned, an increased [heart rate. If you’re experiencing any of these severe ugly side effects you’re drinking too much coffee, you should seek medical attention.](https://www.eatthis.com/health-heart-tips-doctors/) ## You’re feeling fatigued. ![coffee and breakfast](https://www.eatthis.com/wp-content/uploads/sites/4/2022/06/coffee-and-breakfast.jpg?quality=82&strip=all&w=640) ![coffee and breakfast](https://www.eatthis.com/wp-content/uploads/sites/4/2022/06/coffee-and-breakfast.jpg?quality=82&strip=all&w=640) Shutterstock It’s natural to turn to coffee—or other forms of caffeine—when you’re feeling tired. But did you know consuming *too* much caffeine can actually have a negative effect? Especially if it includes [added sugars](https://www.eatthis.com/surprising-foods-with-sugar/). In a study published by *[Innovations in Clinical Neuroscience](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3280075/#B21)*, where participants were given certain amounts of caffeinated beverages for energy, drinking caffeinated beverages—especially with sugar—on a regular basis did cause mental fatigue for participants. While this is common for caffeine to cause decreased [energy levels](https://www.eatthis.com/foods-all-day-energy/) as it wears off, it’s best to time it for when you plan on sleeping—instead of turning to more coffee to keep you awake. Because disrupted sleep later will cause even more fatigue throughout the day, creating a vicious cycle. *A previous version of this article was originally published on January 22, 2021.* Kiersten Hickman Kiersten Hickman is a freelance health and nutrition journalist. [Read more about Kiersten](https://www.eatthis.com/author/kiersten-hickman/) Filed Under [Coffee](https://www.eatthis.com/tag/coffee/) // [Health at Home](https://www.eatthis.com/tag/health-at-home/) // [Health Tips](https://www.eatthis.com/tag/health-tips/) *** ### Read This Next - [![decaf coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2020/12/decaf-coffee.jpg?quality=82&strip=all&w=354&h=256&crop=1) ![](https://www.eatthis.com/wp-content/uploads/sites/4/2020/12/decaf-coffee.jpg?quality=82&strip=all&w=354&h=256&crop=1) Healthy Eating The \#1 Sign You're Overloading on Coffee Listen to your body and cut back.](https://www.eatthis.com/warning-sign-drinking-too-much-coffee/) - [![Stressed woman drinking coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2020/01/tired-nervous-woman-coffee-cup.jpg?quality=82&strip=all&w=354&h=256&crop=1) ![](https://www.eatthis.com/wp-content/uploads/sites/4/2020/01/tired-nervous-woman-coffee-cup.jpg?quality=82&strip=all&w=354&h=256&crop=1) Mind + Body Signs You're Drinking Too Much Coffee These may prove it's time to switch to decaf.](https://www.eatthis.com/news-side-effects-coffee-mayo-clinic/) - [![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/11-copy.png?strip=all&w=354&h=256&crop=1) ![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/11-copy.png?strip=all&w=354&h=256&crop=1) Healthy Eating 7 Yogurts Way Higher in Sugar Than You Think](https://www.eatthis.com/yogurts-higher-sugar/) - [![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/macey11-waves-8957695_1920.jpg?quality=82&strip=all&w=354&h=256&crop=1) ![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/macey11-waves-8957695_1920.jpg?quality=82&strip=all&w=354&h=256&crop=1) Healthy Eating 5 Unhealthiest Fast Food Milkshakes](https://www.eatthis.com/unhealthiest-fast-food-milkshakes-2026/) ### More in Healthy Eating - [![7 Yogurts That Are Way Higher in Sugar Than You Think](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/11-copy.png?strip=all&w=134&h=76&crop=1)![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/11-copy.png?strip=all&w=134&h=76&crop=1) 7 Yogurts Way Higher in Sugar Than You Think](https://www.eatthis.com/yogurts-higher-sugar/) - [![5 Unhealthiest Fast Food Milkshakes You Can Order Right Now](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/macey11-waves-8957695_1920.jpg?quality=82&strip=all&w=134&h=76&crop=1)![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/macey11-waves-8957695_1920.jpg?quality=82&strip=all&w=134&h=76&crop=1) 5 Unhealthiest Fast Food Milkshakes](https://www.eatthis.com/unhealthiest-fast-food-milkshakes-2026/) - [![5 Unhealthiest Fast Food Cheeseburgers in America](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/shutterstock_2482062707.jpg?quality=82&strip=all&w=134&h=76&crop=1)![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/04/shutterstock_2482062707.jpg?quality=82&strip=all&w=134&h=76&crop=1) 5 Unhealthiest Fast Food Cheeseburgers](https://www.eatthis.com/unhealthiest-fast-food-cheeseburgers-america/) - [![5 Fast-Food Orders Personal Trainers Actually Eat to Stay Lean](https://www.eatthis.com/wp-content/uploads/sites/4/2026/03/shutterstock_1513976609.jpg?quality=82&strip=all&w=134&h=76&crop=1)![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/03/shutterstock_1513976609.jpg?quality=82&strip=all&w=134&h=76&crop=1) 5 Fast-Food Orders Trainers Eat to Stay Lean](https://www.eatthis.com/fast-food-orders-personal-trainers-eat-lean/) - [![7 Fast-Food Menu Traps That Add Hidden Calories Fast ](https://www.eatthis.com/wp-content/uploads/sites/4/2026/03/eleatell-dots-7883149_1920.jpg?quality=82&strip=all&w=134&h=76&crop=1)![](https://www.eatthis.com/wp-content/uploads/sites/4/2026/03/eleatell-dots-7883149_1920.jpg?quality=82&strip=all&w=134&h=76&crop=1) 7 Fast-Food Menu Traps That Add Calories](https://www.eatthis.com/fast-food-menu-traps-hidden-calories/) ## Footer menu: - [About Us](https://www.eatthis.com/about-eat-this-not-that/) - [Privacy Policy](https://www.eatthis.com/privacy-policy/) - [Sitemap](https://www.eatthis.com/sitemap/) - [Terms and Conditions](https://www.eatthis.com/terms-and-conditions/) - [Contact Us](https://www.eatthis.com/contact-us/) ## Follow us: - [Facebook](https://www.facebook.com/pages/Eat-This-Not-That/123452516277 "Facebook") - [Instagram](https://www.instagram.com/eatthisnotthat/ "Instagram") - [TikTok](https://www.tiktok.com/@_eatthisnotthat "TikTok") - [Pinterest](https://www.pinterest.com/eatthisnotthat/ "Pinterest") Copyright 2026 [Galvanized Media](https://galvanized.com/). All Rights Reserved. Eat This Not That is part of the People Inc. Publishing Family
Readable Markdown
How much is too much? We have the answer. Let’s just get down to it. How much coffee is considered too much coffee? Surprisingly, you can drink a lot of coffee during the week. It’s actually recommended that people stick to no more than 28 cups of coffee a week, which is about [four cups of coffee a day](https://www.eatthis.com/drinking-this-much-coffee-is-bad/). However, drinking more of that can cause negative effects on one’s health—particularly [their lifespan](https://www.eatthis.com/coffee-habits-shortening-your-life/). [One study](https://www.webmd.com/healthy-aging/news/20130815/heavy-coffee-drinking-tied-to-shorter-lives-for-younger-adults-in-study#1) evaluating 40,000 adults found that drinking more than the average four cups of coffee a day did cause ugly side effects on their bodies. A recent study from the European Society of Cardiology discovered that the sweet spot was two to three cups a day. Plus, it noted that all types of coffee—ground, instant, and decaf—have positive effects that [can extend your life](https://www.eatthis.com/daily-coffee-habit-extend-your-life/). If you’re one to consume more than 32 ounces of coffee a day or love to down sugary lattes from your local coffee chain, it may be wise to evaluate these ugly side effects if you’re drinking too much coffee. Because while having a little [caffeine](https://www.eatthis.com/news-side-effects-drinking-caffeine-science/) can cause a lower risk of death according to the [AARP](https://www.aarp.org/health/healthy-living/info-2018/coffee-longevity-health-benefits.html), drinking too much of it can create negative side effects to one’s health. Here are the ugly side effects to expect if you’re drinking too much coffee, according to research. ## You feel anxious. ![older couples hands holding mugs of coffee, autumn](https://www.eatthis.com/wp-content/uploads/sites/4/2022/10/older-hands-couple-coffee.jpg?quality=82&strip=all&w=640) Shutterstock A typical eight-ounce cup of coffee has 95 milligrams of caffeine in it. So if you were to drink over four cups of coffee, you would hit around 500 milligrams of caffeine in a day. One study by the *[Journal of Psychopharmacology](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4668773/)* reports that being a high consumer of caffeine on this type of level can cause high levels of stress, anxiety, and even depression. The study says that consuming more than 1,000 milligrams of caffeine a week even showed to be a predictor of high anxiety. While anxiety and stress are good things to talk over with a medical professional—especially in terms of your [mental health](https://www.eatthis.com/improve-mental-health/)—it’s also important to evaluate your caffeine intake with that professional and discuss better caffeine habits moving forward. Here are the [Side Effects of Drinking Caffeine, According to Science](https://www.eatthis.com/news-side-effects-drinking-caffeine-science/). ## You’re not getting good sleep. ![woman drinking coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2022/08/woman-drinking-coffee.jpg?quality=82&strip=all&w=640) Shutterstock Regularly consuming coffee can cause issues with your normal sleep patterns, especially if you’re enjoying a pick-me-up cup in the afternoon. [One study](https://pubmed.ncbi.nlm.nih.gov/19858312/) evaluated 197 high school students, a mixed amount of users with moderate caffeine intake reported early morning awakening and daytime sleepiness compared to a group that drank lower amounts of caffeine. While there are a lot of health benefits to drinking coffee on the regular, keeping your daily coffee intake to a minimum—and in the morning—can help with your [sleep](https://www.eatthis.com/lose-weight-in-sleep/) patterns at night. Here are [7 Healthy Diet Changes That Help You Sleep](https://www.eatthis.com/healthy-diet-changes-help-you-sleep/). ## Your heart rate is increasing. ![Barista small coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2018/09/barista-small-coffee.jpg) Shutterstock Although [one controlled study](https://www.ncbi.nlm.nih.gov/pubmed/27749954) showed that drinking 100 milligrams of caffeine between every hour to five hours did not cause increased heart rates, [drinking a significant amount](https://www.ncbi.nlm.nih.gov/pubmed/28527645) can lead to an altered heartbeat rhythm. But it would take a significant amount of caffeine intake to do so. ## You have the jitters. ![large coffee](https://www.eatthis.com/wp-content/uploads/sites/4/2022/03/large-coffee.jpg?quality=82&strip=all&w=640) Shutterstock Ever experience the shakes after too many cups of coffee? This can actually be defined as a caffeine overdose, which [Healthline](https://www.healthline.com/nutrition/how-to-get-caffeine-out-of-your-system#health-risks) states can cause headaches, jitters, difficulty sleeping, and as we already mentioned, an increased [heart rate. If you’re experiencing any of these severe ugly side effects you’re drinking too much coffee, you should seek medical attention.](https://www.eatthis.com/health-heart-tips-doctors/) ## You’re feeling fatigued. ![coffee and breakfast](https://www.eatthis.com/wp-content/uploads/sites/4/2022/06/coffee-and-breakfast.jpg?quality=82&strip=all&w=640) Shutterstock It’s natural to turn to coffee—or other forms of caffeine—when you’re feeling tired. But did you know consuming *too* much caffeine can actually have a negative effect? Especially if it includes [added sugars](https://www.eatthis.com/surprising-foods-with-sugar/). In a study published by *[Innovations in Clinical Neuroscience](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3280075/#B21)*, where participants were given certain amounts of caffeinated beverages for energy, drinking caffeinated beverages—especially with sugar—on a regular basis did cause mental fatigue for participants. While this is common for caffeine to cause decreased [energy levels](https://www.eatthis.com/foods-all-day-energy/) as it wears off, it’s best to time it for when you plan on sleeping—instead of turning to more coffee to keep you awake. Because disrupted sleep later will cause even more fatigue throughout the day, creating a vicious cycle. *A previous version of this article was originally published on January 22, 2021.* Kiersten Hickman Kiersten Hickman is a freelance health and nutrition journalist. [Read more about Kiersten](https://www.eatthis.com/author/kiersten-hickman/)
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