Ask most Indians how much water they drink and they will think for a second. Ask how many cups of chai they had yesterday and they will not know either because nobody counts chai. It is not a beverage in this country, it is a punctuation mark. And that is exactly why it is worth counting.
And how we drink it matters as much as how much. A Tea Board of India pilot study covering 8,500 households found that 63% of respondents reported consuming tea, and a preference for tea with milk and sugar ran above 80% of households though the same report notes a growing shift towards tea without sugar and non-milk teas.
Let us start with the thing you have probably heard and worry about, because it is the weakest of the lot.
The dehydration worry is the wrong one
The idea that tea and coffee pull water out of you is one of the most repeated bits of health advice in India, and the evidence does not support it at normal intakes.
The cleanest test of this is a coffee study rather than a tea one, so read it for the direction rather than as proof about chai. Researchers took 50 habitual coffee drinkers all male, since women were excluded over menstrual-cycle effects on fluid balance and ran a counterbalanced cross-over trial: three days drinking four 200 ml cups of coffee a day, against three days drinking water, with a 10-day washout in between.
Total body water came out at 51.5 kg on coffee versus 51.4 kg on water, and 24-hour urine volume and blood hydration markers were comparable. One measure did differ: urinary sodium excretion was higher on coffee (p = 0.02). The authors' conclusion was that "coffee, when consumed in moderation by caffeine habituated males provides similar hydrating qualities to water."
In fairness to the reader, the funding is worth knowing: the study was funded by the Institute for Scientific Information on Coffee, and one author declared employment at PepsiCo. That does not make the result wrong, but it is the kind of thing you should be told rather than left to discover.
Health services land in the same place. The NHS lists "water, lower-fat milk and sugar-free drinks, including tea and coffee" as counting towards daily fluid intake, alongside a target of 6 to 8 glasses a day. Note the words "sugar-free" in that sentence they do a lot of work, and we will come back to them. (Individual needs vary by body size, heat and activity; we have set out what adequate daily intake looks like separately.)
So the guilt about your chai secretly drying you out is misplaced. Now pick up the three things that have more behind them.
Cost one: tea near your meal competes with your iron
This is the one most worth knowing in India, and it has nothing to do with water.
Tea contains polyphenols that bind to non-heme iron the form of iron in plant foods, which is where most of the iron in a vegetarian diet comes from. Drink tea alongside the meal and less of that iron gets absorbed.
The effect itself is well documented. A 2023 review table in the American Journal of Clinical Nutrition compiled earlier studies and found reported inhibition ranging from 26% to 99% a very wide range, because it depends on the meal, the strength of the tea and how much of it you drink.
The most relevant one for Indian kitchens is a study in 20 young Indian women 10 with iron deficiency anaemia, 10 iron-replete fed a reference rice meal. One cup of tea reduced iron absorption by around 49% in the controls and 59% in the anaemic group; two cups took it to about 66% and 67%. Notably, the inhibitory effect was similar regardless of iron status.
And here is where a 60-minute gap comes in
A more recent controlled trial asked a narrower question: does waiting help? It gave 12 iron-replete, non-anaemic UK women a standardised oat porridge meal labelled with a stable iron isotope, in three conditions with water, with tea, and with tea one hour after the meal.
The result that mattered: iron absorption was significantly higher when tea came an hour after the meal than when it came with the meal (P = 0.046).
Now the honest caveat, because this article would be worthless without it. In that same small trial, the difference between tea-with-meal and water was about 35% but did not reach statistical significance (P = 0.398). Twelve women, already iron-replete, eating oat porridge, is not the study to quote for how big tea's effect is the older studies above are. What this trial supports is the timing: the gap helped, measurably.
So the claim worth making is the modest one. Tea reduces non-heme iron absorption that much is established across many studies. And putting an hour between the meal and the tea appears to recover a meaningful part of it.
The fix is a clock, not a sacrifice: put an hour between your meal and your tea. It costs nothing and changes nothing about how much tea you drink.
Where India actually stands, with the caveats
In NFHS-5, two in three children under five were anaemic, along with over half of women and a quarter of men aged 15–49, and prevalence appeared to rise between the 2015–16 and 2019–21 rounds.
Three things stop that from being a simple story, and they are worth stating rather than glossing over.
- India's anaemia numbers may be overstated by the method. The capillary (finger-prick) method India uses produces higher and less reliable estimates — in one comparison among children, prevalence was 47% by venous blood against 59% by capillary.
- It is not all iron. How much of India's anaemia is caused by iron deficiency alone "has not yet been conclusively established".
- Vegetarians are not the villains here. Once income, location, caste and other variables were controlled for, researchers found vegetarians were not more likely to be anaemic.
None of that makes the tea-timing habit pointless. It just means the honest framing is "a cheap, harmless improvement to how you already drink tea", not "this is why India is anaemic".
If fatigue, hair fall or breathlessness sound familiar, we have written separately about what deficiency actually looks like but the first step there is a blood test, not a diet change.
Cost two: the 4 pm cup you have forgotten about by midnight
Everyone knows coffee before bed is a bad idea. Almost nobody knows how early "before bed" starts.
Researchers gave 12 healthy adults 400 mg of caffeine at three different times — at bedtime, three hours before bed, and six hours before bed — and measured their sleep objectively. Even the six-hours-before dose significantly disrupted sleep, cutting total sleep time by more than one hour.
The striking part: participants did not notice. They lost over an hour of sleep and reported no awareness of it. The study team's practical recommendation was that caffeine "generally should be avoided after 5 p.m."
Six hours before an 11 pm bedtime is 5 pm. So the shaam ki chai at the office, the one you have while wrapping up, the 6 pm cup with samosa — those are not innocent. And because you cannot feel the damage, you will never connect the two. You will just think you are someone who "doesn't sleep well."
Two caveats worth stating plainly. This was 400 mg in one hit, which is a large dose more than most single Indian cups. And people metabolise caffeine at very different speeds; some genuinely are less affected. But if you sleep badly and have never tested a caffeine curfew, that is a free experiment with a real chance of working. It also pairs with the other big sleep thief, which we covered in how doomscrolling wrecks your sleep and one small note connecting the two: a warm drink is a genuinely good wind-down ritual, as long as the warm drink is not the caffeinated one.
Cost three: the sugar you never counted as sugar
Remember that the NHS counted sugar-free tea and coffee towards your fluid intake. For most Indian households, that caveat is the whole story the Tea Board study above put the preference for tea with milk and sugar above 80% of households.
The benchmark, stated precisely, because the two WHO numbers get muddled constantly. WHO's recommendation is that adults keep free sugars to less than 10% of total energy intake. It then adds a conditional suggestion: a further reduction to below 5%, roughly 25 grams or 6 teaspoons a day, would bring additional benefits.
So 6 teaspoons is the stretch target, not the ceiling. The ceiling is the 10% figure, which is about double that for a typical adult diet.
That distinction matters, because it decides whether chai is a problem or just something to keep an eye on. Four or five cups at one teaspoon each will not breach the 10% recommendation on their own but they will use up most of the 6-teaspoon stretch target before you have eaten anything. And that is only the sugar you add knowingly; it sits on top of whatever comes in biscuits, namkeen and everything else in the day.
Nobody thinks of chai as a sugary drink, because it arrives in a small glass and it is not fizzy. But sugar does not know what container it came in. The same counting habit that catches hidden sugar in packaged juices applies here, except there is no label to read you are the one adding it, which also means you are the one who can reduce it.
How much caffeine is actually too much?
EFSA, the European food safety authority, has assessed this. For healthy adults it concluded that single doses up to 200 mg, and up to 400 mg over 24 hours, are safe. For pregnant and breastfeeding women the figure is lower up to 200 mg a day. The NHS gives the same 200 mg ceiling in pregnancy.
For rough orientation, the same source gives reference figures: about 50 mg of caffeine in a 220 ml cup of tea, 90 mg in a 200 ml filter coffee and 80 mg in a 60 ml espresso putting 200 mg at roughly four cups of tea or two and a half espressos.
Treat those as reference values, not as a reading of your cup. The caffeine in Indian tea depends on the leaf, the brew time, and how much milk and water went in a long-brewed tapri chai and a weak home cup are not the same drink, and neither is a 220 ml European cup the same as the small glass most chai arrives in. Use the numbers for direction: if your intake runs well into double figures, or you are pregnant, the limits above are worth a conversation with your doctor.
Five changes that survive contact with real life
None of these ask you to give up chai, because advice that asks that gets ignored by lunchtime.
- Put an hour between food and chai. The single highest-value change in this article, and worth more attention if you have been told you are anaemic. Meal first, then tea an hour later.
- Set a caffeine curfew, not a caffeine cut. Pick a time 4 pm, 5 pm and after that switch to something without caffeine. Keep the total number of cups exactly the same if you like. You are moving them, not losing them.
- One glass of water with every cup. Not because chai dehydrates you, but because it is the easiest habit-stacking trick available: you already remember the chai, so let the chai remind you about the water.
- Reduce sugar gradually rather than all at once. A quarter spoon at a time, slow enough that your tongue does not file a complaint. Six weeks to drop one spoon is a win, not a failure of willpower.
- Count your cups for three days. Just count no changes, no judgement. The number is often higher than expected, because chai gets handed to you at other people's houses, in meetings, at the shop, and none of those register as a decision. You cannot move a habit you have never measured. (The first cup of the day is its own topic, and we have looked at it in morning habits that quietly work against you.)
The bottom line
The thing India worries about with chai dehydration has the least behind it. The three that are worth attention are the quieter ones: iron absorption that tea near a meal reliably reduces, where a one-hour gap measurably helps; an hour of sleep that can disappear from a cup you had at 5 pm without you ever noticing; and added sugar that runs through most of WHO's stretch target before you have eaten anything.
None of these asks you to give up chai. Every fix here is a change of timing, not a change of identity. Keep the chai. Move it.
Frequently asked questions
Does tea or coffee cause dehydration?
The evidence does not support it at moderate intakes. A cross-over trial in men found four cups of coffee a day produced hydration markers comparable to water, though urinary sodium excretion was higher on coffee and the study was coffee-specific and industry-funded. The NHS counts sugar-free tea and coffee towards daily fluid intake.
How long should I wait between food and tea?
One hour is the gap that has been tested. In a controlled trial in 12 women, iron absorption was significantly higher when tea came an hour after the meal than when it came with the meal (P = 0.046). In that same small trial the tea-versus-water difference was not statistically significant, so treat the gap as a sensible, zero-cost habit rather than a dramatic intervention.
What time should I stop drinking coffee?
Researchers found 400 mg of caffeine six hours before bed still cut total sleep by more than an hour, and suggested avoiding caffeine after 5 p.m. Individual sensitivity varies, so treat it as an experiment worth running on yourself.
How much caffeine is safe per day?
EFSA concluded that for healthy adults up to 400 mg a day and 200 mg in a single dose are safe, with 200 mg a day for pregnant and breastfeeding women. How many cups that equals depends entirely on how your tea is made.
How much caffeine is in a cup of Indian chai?
There is no reliable single number. EUFIC's reference figure is about 50 mg in a 220 ml cup of tea, but Indian chai varies with leaf, brew time, milk and glass size, so treat that as orientation rather than a measurement of your cup.
This article is for general information and awareness. It is not medical advice, and Amaayu products are not intended to diagnose, treat, cure or prevent any disease. For anaemia, persistent fatigue, sleep problems or any ongoing symptom, consult a registered medical practitioner.