{"id":288,"date":"2026-10-03T17:15:33","date_gmt":"2026-10-03T17:15:33","guid":{"rendered":"https:\/\/www.tisaneaddict.business\/?p=288"},"modified":"2026-10-03T17:17:41","modified_gmt":"2026-10-03T17:17:41","slug":"does-tea-dehydrate","status":"publish","type":"post","link":"https:\/\/www.tisaneaddict.business\/en\/le-the-deshydrate-t-il\/","title":{"rendered":"Does tea cause dehydration? True or false\u2014what the studies say"},"content":{"rendered":"<div style=\"margin: 0 0 28px; background: #ffffff; border: 1px solid rgba(76,93,78,0.14); border-radius: 24px; box-shadow: 0 14px 34px rgba(39,49,48,0.08); overflow: hidden;\"><div style=\"position: relative; padding: 44px 30px 38px; background: radial-gradient(circle at 14% 18%, rgba(255,255,255,0.14), transparent 24%), radial-gradient(circle at 82% 24%, rgba(200,164,106,0.20), transparent 26%), linear-gradient(135deg, #2D3A2F 0%, #4C5D4E 46%, #7A8F79 100%);\"><span style=\"display: inline-block; margin: 0 0 14px; padding: 8px 16px; border-radius: 999px; background: rgba(39,49,48,0.45); border: 1px solid rgba(200,164,106,0.50); color: #f5e9d1; font-size: 12px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;\">Tisane Addict \u2022 The Infusion Journal<\/span><p style=\"margin: 0; max-width: 680px; color: #eef3ec; font-size: 15.5px; line-height: 1.8;\">\u00abA cup of tea doesn\u2019t count\u2014it just makes you lose water.\u00bb We\u2019ve all heard that. We\u2019ve put this common misconception to the test using clinical trials and the opinions of European authorities, without sugarcoating anything.<\/p><\/div><div style=\"padding: 24px 30px; background: #f7f6f0; border-top: 1px solid rgba(200,164,106,0.35);\"><h2 style=\"margin: 0 0 10px; color: #2d3a2f; font-size: 20px; font-weight: 800; letter-spacing: -0.01em;\">Does tea cause dehydration? What two clinical trials found<\/h2><p style=\"margin: 0; font-size: 16.5px;\"><strong style=\"color: #2d3a2f;\">No, when consumed in normal amounts, tea does not cause dehydration.<\/strong> In a randomized trial published in 2011, drinking 4 to 6 mugs of black tea per day showed no difference from drinking the same amount of water in terms of hydration markers. A second study from 2016 confirms that tea does not cause people to urinate more than water does. Caffeine does have a diuretic effect, but it only becomes apparent at high doses.<\/p><\/div><\/div><nav aria-label=\"Article Summary\" style=\"margin: 0 0 30px; padding: 18px 22px; background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><p style=\"margin: 0 0 8px; color: #c8a46a; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;\">In this article<\/p><p style=\"margin: 0; font-size: 15px; line-height: 2;\"><a style=\"color: #4c5d4e; font-weight: bold; text-decoration: none;\" href=\"#origine\">1. Where Does the Myth Come From?<\/a> &nbsp;\u00b7&nbsp; <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: none;\" href=\"#etudes\">2. What the Studies Say<\/a> &nbsp;\u00b7&nbsp; <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: none;\" href=\"#vrai-faux\">3. True or False: 5 Common Misconceptions<\/a> &nbsp;\u00b7&nbsp; <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: none;\" href=\"#limites\">4. Limits You Should Be Aware Of<\/a> &nbsp;\u00b7&nbsp; <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: none;\" href=\"#faq\">FAQ<\/a><\/p><\/nav><p>It\u2019s a persistent myth, and it even sounds logical: tea contains caffeine, caffeine makes you urinate, so tea supposedly causes you to lose more water than it provides. Some people even go so far as to recommend drinking a glass of water with every cup, just to \u00abcompensate\u00a0.\u00bb At Tisane Addict, we prefer to check the facts before repeating them. So we took a look at the clinical trials that have thoroughly examined this question\u2014examining not only their results but also their limitations and funding sources. Here\u2019s our detailed verdict.<\/p><section id=\"origine\"><h2 style=\"margin: 38px 0 16px; color: #2d3a2f; font-size: 26px; font-weight: 800; letter-spacing: -0.02em;\">1. Where did the idea that tea causes dehydration come from?<\/h2><p>The starting point is a fact: caffeine\u2014which is called theine in tea but is exactly the same molecule\u2014has a diuretic effect. The problem stems from oversimplification. This effect has mainly been observed with high doses of caffeine\u2014often administered in pill form\u2014in people who did not normally consume it. A cup of tea, on the other hand, is almost entirely water, with a moderate amount of caffeine. Applying one to the other without taking measurements\u2014that\u2019s where the myth began.<\/p><\/section><section id=\"etudes\"><h2 style=\"margin: 38px 0 16px; color: #2d3a2f; font-size: 26px; font-weight: 800; letter-spacing: -0.02em;\">2. What the Studies Say, Backed by Statistics<\/h2><div style=\"background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; padding: 6px 24px; margin: 22px 0; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><div style=\"display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: baseline; padding: 18px 0; border-bottom: 1px solid rgba(76,93,78,0.12);\"><span style=\"flex: 0 0 150px; color: #c8a46a; font-size: 15px; font-weight: 800; letter-spacing: .04em;\">2011<\/span><div style=\"flex: 1 1 300px;\"><p style=\"margin: 0 0 2px; color: #2d3a2f; font-weight: 800; font-size: 16px;\">Ruxton &amp; Hart, British Journal of Nutrition<\/p><p style=\"margin: 0; font-size: 14.5px; line-height: 1.7;\">21 healthy men, randomized crossover trial: 4 or 6 mugs (240 ml each) of black tea with a splash of milk (equivalent to 168 or 252 mg of caffeine), compared to the same amount of water. Result: No significant difference in blood and urine markers of hydration. <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: underline;\" href=\"https:\/\/www.cambridge.org\/core\/product\/E5142A6CCACBB28C1018119B2CE2935D\/core-reader\" target=\"_blank\" rel=\"noopener\">Read the study<\/a><\/p><\/div><\/div><div style=\"display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: baseline; padding: 18px 0; border-bottom: 1px solid rgba(76,93,78,0.12);\"><span style=\"flex: 0 0 150px; color: #c8a46a; font-size: 15px; font-weight: 800; letter-spacing: .04em;\">2016<\/span><div style=\"flex: 1 1 300px;\"><p style=\"margin: 0 0 2px; color: #2d3a2f; font-weight: 800; font-size: 16px;\">Maughan et al., *American Journal of Clinical Nutrition*<\/p><p style=\"margin: 0; font-size: 14.5px; line-height: 1.7;\">72 volunteers; 13 common beverages were tested, with one liter of each consumed. Over the next four hours, the amount of urine produced after drinking hot tea, iced tea, or coffee was no different from that observed after drinking water. <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: underline;\" href=\"https:\/\/stir.ac.uk\/research\/hub\/publication\/577765\" target=\"_blank\" rel=\"noopener\">Read the study<\/a><\/p><\/div><\/div><div style=\"display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: baseline; padding: 18px 0;\"><span style=\"flex: 0 0 150px; color: #c8a46a; font-size: 15px; font-weight: 800; letter-spacing: .04em;\">400 mg\/day<\/span><div style=\"flex: 1 1 300px;\"><p style=\"margin: 0 0 2px; color: #2d3a2f; font-weight: 800; font-size: 16px;\">EFSA, Opinion on the Safety of Caffeine (2015)<\/p><p style=\"margin: 0; font-size: 14.5px; line-height: 1.7;\">The European Food Safety Authority considers that up to 400 mg of caffeine per day, from all sources, does not pose a safety concern for a healthy adult (200 mg for pregnant or breastfeeding women). <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: underline;\" href=\"https:\/\/www.efsa.europa.eu\/en\/topics\/topic\/caffeine\" target=\"_blank\" rel=\"noopener\">View the review<\/a><\/p><\/div><\/div><\/div><p>To put this into perspective, here\u2019s a quick calculation based on the 2011 study: 168 mg divided among 4 mugs equals about 42 mg of caffeine per mug of black tea under the study\u2019s conditions. The 6 mugs consumed by the group with the highest intake therefore remained well below the 400 mg threshold set by the EFSA and did not tip the water balance.<\/p><\/section><section id=\"vrai-faux\"><h2 style=\"margin: 38px 0 16px; color: #2d3a2f; font-size: 26px; font-weight: 800; letter-spacing: -0.02em;\">3. True or False: 5 Common Misconceptions Put to the Test<\/h2><div style=\"background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; padding: 6px 24px; margin: 22px 0; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><div style=\"display: flex; gap: 16px; align-items: flex-start; padding: 18px 0; border-bottom: 1px solid rgba(76,93,78,0.12);\"><span style=\"flex: 0 0 64px; padding: 6px 0; text-align: center; border-radius: 999px; background: #2D3A2F; color: #f5e9d1; font-weight: 800; font-size: 13px;\">FALSE<\/span><p style=\"margin: 0; font-size: 15.5px; line-height: 1.75;\"><strong style=\"color: #2d3a2f;\">\u00abA cup of tea causes you to lose more water than it provides.\u00bb<\/strong> The two studies cited show no net loss compared to water at the tested concentrations.<\/p><\/div><div style=\"display: flex; gap: 16px; align-items: flex-start; padding: 18px 0; border-bottom: 1px solid rgba(76,93,78,0.12);\"><span style=\"flex: 0 0 64px; padding: 6px 0; text-align: center; border-radius: 999px; background: #2D3A2F; color: #f5e9d1; font-weight: 800; font-size: 13px;\">FALSE<\/span><p style=\"margin: 0; font-size: 15.5px; line-height: 1.75;\"><strong style=\"color: #2d3a2f;\">\u00abYou should drink a glass of water for every cup of tea.\u00bb<\/strong> Nothing in these studies justifies this \u00abcompensation\u00bb: tea definitely counts toward your daily fluid intake.<\/p><\/div><div style=\"display: flex; gap: 16px; align-items: flex-start; padding: 18px 0; border-bottom: 1px solid rgba(76,93,78,0.12);\"><span style=\"flex: 0 0 64px; padding: 6px 0; text-align: center; border-radius: 999px; background: #C8A46A; color: #2d3a2f; font-weight: 800; font-size: 13px;\">TRUE<\/span><p style=\"margin: 0; font-size: 15.5px; line-height: 1.75;\"><strong style=\"color: #2d3a2f;\">\u00abCaffeine has a diuretic effect.\u00bb<\/strong> Yes, but it is most noticeable at high doses and becomes less pronounced in regular consumers. At the levels typically consumed in tea, it was not detectable in the tests.<\/p><\/div><div style=\"display: flex; gap: 16px; align-items: flex-start; padding: 18px 0; border-bottom: 1px solid rgba(76,93,78,0.12);\"><span style=\"flex: 0 0 64px; padding: 6px 0; text-align: center; border-radius: 999px; background: #2D3A2F; color: #f5e9d1; font-weight: 800; font-size: 13px;\">FALSE<\/span><p style=\"margin: 0; font-size: 15.5px; line-height: 1.75;\"><strong style=\"color: #2d3a2f;\">\u00abGreen tea is less dehydrating than black tea.\u00bb<\/strong> None of the studies cited compared the two. What actually varies is the amount of caffeine, depending on the tea leaves, the dosage, and the steeping time\u2014not a property specific to the tea\u2019s color.<\/p><\/div><div style=\"display: flex; gap: 16px; align-items: flex-start; padding: 18px 0;\"><span style=\"flex: 0 0 64px; padding: 6px 0; text-align: center; border-radius: 999px; background: #C8A46A; color: #2d3a2f; font-weight: 800; font-size: 13px;\">TRUE<\/span><p style=\"margin: 0; font-size: 15.5px; line-height: 1.75;\"><strong style=\"color: #2d3a2f;\">\u00abHerbal teas do not contain caffeine.\u00bb<\/strong> Verbena, chamomile, <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: underline;\" href=\"https:\/\/www.tisaneaddict.business\/en\/product\/organic-natural-rooibos-without-theine\/\">rooibos<\/a>, raspberry leaves: these plants are not related to the tea plant and do not contain any tea. The only notable exception among common herbal teas is mate, which contains caffeine.<\/p><\/div><\/div><\/section><aside style=\"margin: 26px 0; padding: 22px 26px; background: linear-gradient(135deg, rgba(45,58,47,0.05), rgba(200,164,106,0.10)); border: 1px solid rgba(200,164,106,0.45); border-radius: 16px;\"><p style=\"margin: 0 0 6px; color: #c8a46a; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;\">Tisane Addict Tasting Council<\/p><p style=\"margin: 0; font-size: 15.5px; line-height: 1.8;\">Do you enjoy the taste of tea but prefer to cut back on caffeine at the end of the day? Our <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: underline;\" href=\"https:\/\/www.tisaneaddict.business\/en\/product\/feuilles-de-framboisier-bio\/\">organic raspberry leaves<\/a> are, of all our herbal infusions, the ones that most closely resemble plain tea: a plant-based, well-rounded, slightly tannic cup, without a trace of caffeine.<\/p><\/aside><section id=\"limites\"><h2 style=\"margin: 38px 0 16px; color: #2d3a2f; font-size: 26px; font-weight: 800; letter-spacing: -0.02em;\">4. The Limits You Need to Know\u2014Because We Owe You Honesty<\/h2><p>These findings are solid, but they have limitations. The 2011 study involved 21 men at rest in a laboratory setting: its results cannot be carelessly extrapolated to intense physical exertion or extreme heat. Furthermore, both studies were funded by organizations with ties to the industry\u2014the Tea Advisory Panel for the first, and the European Hydration Institute for the second. This does not invalidate them\u2014they were published in peer-reviewed journals\u2014but it is information we prefer to share with you rather than withhold.<\/p><p>Finally, \u00abdoes not cause dehydration\u00bb does not mean \u00abthere are no limits.\u00bb Caffeine is still subject to the EFSA\u2019s guidelines, and people who are sensitive to it would be better off switching to herbal tea in the evening, as we explained in our guide <a style=\"color: #4c5d4e; font-weight: bold; text-decoration: underline;\" href=\"https:\/\/www.tisaneaddict.business\/en\/tea-or-herbal-tea-after-a-meal\/\">tea or herbal tea after a meal<\/a>. If you have any questions regarding a specific medical condition, you should consult a healthcare professional.<\/p><\/section><section id=\"retenir\"><div style=\"margin: 30px 0; background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-top: 3px solid #C8A46A; border-radius: 16px; padding: 22px 26px; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><p style=\"margin: 0 0 10px; color: #c8a46a; font-size: 12px; font-weight: 800; letter-spacing: .12em; text-transform: uppercase;\">Key Takeaways<\/p><ul style=\"margin: 0; padding: 0 0 0 20px; font-size: 15.5px; line-height: 1.9;\"><li>When consumed in normal amounts, tea does not cause dehydration: two clinical trials found no difference compared to water.<\/li><li>Caffeine does have a diuretic effect, but it is associated with high doses.<\/li><li>EFSA guideline: up to 400 mg of caffeine per day for a healthy adult.<\/li><li>Herbal teas are caffeine-free, except for mate.<\/li><\/ul><\/div><\/section><aside style=\"margin: 34px 0; background: #ffffff; border: 1px solid rgba(76,93,78,0.14); border-radius: 24px; overflow: hidden; box-shadow: 0 14px 34px rgba(39,49,48,0.08);\"><div style=\"padding: 30px; background: linear-gradient(135deg, #2D3A2F 0%, #4C5D4E 100%);\"><span style=\"display: inline-block; margin: 0 0 12px; padding: 7px 14px; border-radius: 999px; background: rgba(39,49,48,0.45); border: 1px solid rgba(200,164,106,0.50); color: #f5e9d1; font-size: 11px; font-weight: 800; letter-spacing: .14em; text-transform: uppercase;\">Tisane Addict Selection<\/span><p style=\"margin: 0; color: #f9f5ec; font-size: 15.5px; line-height: 1.85;\">At Tisane Addict, we focus on taste, not health benefits: when a topic relates to health, we refer readers to published studies and authoritative sources\u2014with all their limitations\u2014and leave the promises to others. We apply the same rigor to our tea and herbal tea product descriptions. Orders are carefully prepared and shipped from France.<\/p><\/div><\/aside><section id=\"faq\"><h2 style=\"margin: 38px 0 18px; color: #2d3a2f; font-size: 26px; font-weight: 800; letter-spacing: -0.02em;\">FAQ: Tea and Hydration<\/h2><div style=\"background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; padding: 24px 26px; margin: 0 0 18px; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><h3 style=\"margin: 0 0 10px; color: #2d3a2f; font-size: 18px; font-weight: 800;\">Does tea count toward the amount of water you drink each day?<\/h3><p style=\"margin: 0; font-size: 15.5px; line-height: 1.8;\">According to the available clinical trials, yes: at the amounts tested (up to 6 mugs per day in the 2011 study), tea showed no difference from water in terms of hydration markers. Water remains the gold standard, but tea should not be excluded from the total.<\/p><\/div><div style=\"background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; padding: 24px 26px; margin: 0 0 18px; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><h3 style=\"margin: 0 0 10px; color: #2d3a2f; font-size: 18px; font-weight: 800;\">Why do we feel the urge to urinate after drinking tea?<\/h3><p style=\"margin: 0; font-size: 15.5px; line-height: 1.8;\">First, because we\u2019ve just consumed a certain amount of liquid\u2014as with a large glass of water. The 2016 study shows that, over a four-hour period, tea does not cause the body to produce more urine than the same amount of water.<\/p><\/div><div style=\"background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; padding: 24px 26px; margin: 0 0 18px; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><h3 style=\"margin: 0 0 10px; color: #2d3a2f; font-size: 18px; font-weight: 800;\">How many cups of tea can you drink per day?<\/h3><p style=\"margin: 0; font-size: 15.5px; line-height: 1.8;\">The official guideline focuses on caffeine, not on cups: the EFSA recommends 400 mg per day for a healthy adult, from all sources combined, and 200 mg during pregnancy or while breastfeeding. The caffeine content of a single cup varies depending on the type of tea, the amount used, and the steeping time, so you need to add this to your intake from coffee, sodas, and chocolate.<\/p><\/div><div style=\"background: #ffffff; border: 1px solid rgba(76,93,78,0.16); border-radius: 16px; padding: 24px 26px; margin: 0 0 8px; box-shadow: 0 8px 22px rgba(39,49,48,0.06);\"><h3 style=\"margin: 0 0 10px; color: #2d3a2f; font-size: 18px; font-weight: 800;\">Does iced tea cause more dehydration?<\/h3><p style=\"margin: 0; font-size: 15.5px; line-height: 1.8;\">No: The 2016 study tested iced tea in the same way as hot tea, finding no difference compared to water. Just be careful with highly sweetened store-bought versions\u2014they\u2019re a different story altogether: homemade iced tea is still the safest bet.<\/p><\/div><\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":289,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-288","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-le-monde-du-the"],"_links":{"self":[{"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/posts\/288","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/comments?post=288"}],"version-history":[{"count":2,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/posts\/288\/revisions"}],"predecessor-version":[{"id":291,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/posts\/288\/revisions\/291"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/media\/289"}],"wp:attachment":[{"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/media?parent=288"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/categories?post=288"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tisaneaddict.business\/en\/wp-json\/wp\/v2\/tags?post=288"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}