Drinking too much tea can lead to several adverse side effects, primarily due to its caffeine, tannin, and oxalate content[1][3][5].
- Anxiety, Restlessness, and Sleep Disturbances: Excessive caffeine in tea can cause increased anxiety, stress, palpitations, difficulty sleeping, and even irritability[1][5][7].
- Headaches: High intake of caffeine from tea may trigger frequent headaches or worsen existing ones[1][5].
- Digestive Issues: The tannins in tea can irritate the digestive system, potentially causing nausea, acid reflux, and constipation. Severe dehydration and hard stool are also possible due to caffeine and theophylline in tea[1][8].
- Caffeine Dependence: Frequent consumption may lead to dependence on caffeine, with possible withdrawal symptoms if tea intake is reduced[1].
- Iron Deficiency Anemia: Tannins in tea reduce the absorption of non-heme iron, increasing the risk of iron deficiency, especially in those already at risk (such as vegetarians or people with anemia)[1][3][4][7].
- Dehydration: The diuretic effect of caffeine and the presence of theophylline might contribute to fluid loss and dehydration if consumed excessively[1][7][8].
- Dental Issues: High levels of tannins can stain teeth and contribute to plaque formation and cavities[1].
- Higher Risk of Kidney Stones: Overconsumption of tea introduces a high oxalate load, which is associated with kidney stone formation and, in extreme cases, kidney damage[4].
- Increased Cancer Risk (Very Hot Tea): Consuming “very hot” tea (above 65°C/140°F) is linked to a higher risk of esophageal cancer, with the risk intensifying if combined with alcohol or tobacco use[2].
- Blood Pressure Fluctuations: Some reports suggest excessive milk tea may lead to fluctuations in blood pressure, which can be problematic, particularly for individuals with hypertension[8].
Although moderate tea intake (2–4 cups per day) can have health benefits, regularly exceeding this amount increases the risk of these side effects. Moderation and attention to overall diet and risk factors (like existing medical conditions or nutrient deficiencies) are essential[1][3][5][7].
References
- [1] Know the side effects of drinking too much tea | HealthShots
- [2] Tea – The Nutrition Source
- [3] Side Effects and Nine Reasons to Avoid Consuming Excessive Tea
- [4] Health effects of tea – Wikipedia
- [5] Side Effects of Tea: 9 Reasons Not to Drink Too Much – Healthline
- [7] Tea Overload: Is Your Daily Cuppa Harming Your Health?
- [8] Side Effects of Drinking Too Much Tea – HDFC Ergo
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