Cover From coffee to tea, science challenges long-held caffeine myths and reveals what’s really in your cup. (Photo: Freepik)
From coffee to tea, science challenges long-held caffeine myths and reveals what’s really in your cup. (Photo: Freepik)
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Caffeine myths abound, but not all are true. Here’s what science actually says about your daily brew
Caffeine is one of the most widely consumed psychoactive substances in the world, woven into daily rituals from morning coffee to pre-workout supplements. Despite its ubiquity, misconceptions about caffeine persist—often passed down as common wisdom without the backing of scientific evidence. From fears of dehydration to assumptions about addiction, these myths can shape how people approach or avoid their daily brew. Here, the research separates fact from fiction.
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1. Caffeine dehydrates you
The idea that caffeine causes dehydration stems from its mild diuretic effect. However, studies in the Journal of the International Society of Sports Nutrition 2024 note that moderate daily doses (around 250–300 mg) do not increase urine volume in habitual consumers. Only high intakes—over 500 mg at once or the equivalent of a really strong brew in Venti size—may trigger noticeable fluid loss, and even then, it is unlikely to cause dehydration if overall fluid intake is adequate.
2. Caffeine is an effective weight-loss tool
While caffeine can temporarily increase fat oxidation during exercise, its impact on long-term weight or fat loss is inconsistent. Results vary depending on dose, individual fitness level and whether other compounds are consumed alongside it. Evidence does not support caffeine as a standalone fat-loss aid.
3. Regular caffeine use diminishes its effects
Above Research separates fact from fiction on caffeine’s effects, from hydration to bone health. (Photo: Kroshka__nastya / Freepik)
Research separates fact from fiction on caffeine’s effects, from hydration to bone health. (Photo: Kroshka__nastya / Freepik)
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It is often claimed that daily caffeine drinkers no longer benefit from its performance-enhancing effects. Yet, the same research shows that habitual intake does not eliminate the boost from an acute dose. In some cases, higher amounts—6–9 mg per kilogram of body weight—may be needed for noticeable effects, but the overall benefit remains.
4. Caffeine stunts bone health
Concerns about caffeine reducing bone mineral density largely apply to extremely high intakes or inadequate calcium consumption. Most evidence suggests that up to four cups of coffee a day (around 400 mg of caffeine) is safe for bone health in healthy adults, though caution is advised for those with osteoporosis risk factors.
5. Caffeine is addictive
Caffeine can cause dependence and withdrawal symptoms such as headaches or irritability, but it does not meet the clinical criteria for addiction in the way substances like nicotine or opioids do. It works via different brain pathways and does not typically drive compulsive use.
Many long-standing beliefs about caffeine fail to hold up under scrutiny. While moderation is key, research shows that for most healthy adults, caffeine can be enjoyed without the risks often claimed, provided it is consumed within recommended limits and with attention to individual tolerance.
Chonx Tibajia is a senior editor at Tatler Asia’s T-Labs team, where she writes widely on lifestyle subjects including beauty, style, entertainment and travel. She has a long career in journalism, including roles as a columnist at The Philippine Star, and is the founder of the creative platform Pineappleversed. Beyond Tatler, her bylines appear in regional lifestyle and business publications, showcasing a broad portfolio that spans beauty trends, travel guides and culture pieces.
