How Many Cups of Tea a Day Is Safe? Counting Your Chai

How many cups of tea a day is safe? For most healthy adults, three to four regular cups of tea are generally within the recommended daily caffeine limit. However, it depends on how strong your tea is and what else you are drinking throughout the day. Think about a typical day. You start with a cup of morning chai, have another at work around 11, grab a filter coffee after lunch to beat the afternoon slump and join your colleagues for a 4 pm tea break. By evening, you might have another cup while watching the news. It doesn’t feel like much because each cup is part of your routine. Yet caffeine adds up, especially when your tea is strong or you are drinking coffee alongside it. For most healthy adults, the recommended limit is around 400 mg of caffeine a day. Your personal limit may be lower if you're pregnant or sensitive to caffeine. Drinking tea with meals may also affect iron absorption. So, how do you know if you're drinking too much? It helps to look at how much caffeine is actually in your daily cups, when you drink them and whether they're affecting your sleep or health.

How many cups of tea a day is safe for an adult?

The number most health bodies use is 400 mg of caffeine a day. MedlinePlus, the US National Library of Medicine’s health site, says that for most people it is not harmful to consume up to 400 mg of caffeine a day. The European Food Safety Authority reached the same figure after reviewing the evidence: intakes up to 400 mg per day spread through the day do not raise safety concerns for healthy adults, with pregnant women as the exception. If you are pregnant or breastfeeding, the limit halves. EFSA puts it at 200 mg a day from all sources. The UK’s NHS gives pregnant women the same 200 mg ceiling. That includes tea, coffee, cola, chocolate and any energy drink. The 400 mg figure is a ceiling for healthy adults, not a target. Some people feel jittery on far less. If that is you, your body’s signal matters more than any number.

How much caffeine is in your chai, coffee and cola?

Caffeine content varies a lot with the leaf, the brew time and the size of the cup. That is why every reliable source gives a range rather than one fixed number.

• Tea: MedlinePlus lists 14 to 60 mg in an 8-ounce (about 240 ml) cup. The NHS uses an estimate of 75 mg in a cup of tea, black or green.

• Brewed coffee: 95 to 200 mg in an 8-ounce cup. South Indian filter coffee made with a strong decoction falls in this brewed category.

• Instant coffee: The NHS estimates 100 mg in a cup, while filter and coffee-shop coffee can contain more.

• Cola: 35 to 45 mg in a 12-ounce (about 355 ml) can.

• Energy drinks: 70 to 100 mg in 8 ounces. Their labels do not always show the true amount.

Indian cups are often smaller than 240 ml. A cutting chai or a steel tumbler holds less, so each one carries less caffeine. On the other side, chai boiled for a long time with an extra spoon of leaves can come out stronger than a quick tea bag dip.

Adding up a typical Indian day

Let’s look at how much caffeine you're getting from your usual tea breaks. According to NHS estimates, a regular cup of tea contains around 75 mg of caffeine. So, four cups add up to roughly 300 mg. Now add a strong filter coffee after lunch. Depending on how it's prepared, you could be close to or even exceed the recommended 400 mg daily limit for most healthy adults. A cola with dinner adds more caffeine to your total. Does that mean five cups of tea are too much? Not necessarily. The size and strength of each cup matter. Five small cups of light tea may contain less caffeine than three large mugs of strong coffee. The easiest way to check is to track what you drink for two typical days. Include your morning chai, office tea breaks, coffee, soft drinks and even that extra cup at a friend's house. Note the cup size, how strong the drink is and what time you have it. This helps you estimate your daily caffeine intake and spot habits that might be affecting your sleep.

Remember: Staying below 400 mg doesn’t automatically mean caffeine won’t affect you. Some people experience poor sleep, restlessness or a racing heartbeat at much lower amounts, especially when they drink tea or coffee late in the day.

Signs you are overdoing it

Your body may tell you before any number does. MedlinePlus lists the effects of too much caffeine as restlessness and shakiness, insomnia, headaches, dizziness, a fast heart rate, dehydration and anxiety. The same page notes caffeine increases the release of acid in your stomach, which can mean heartburn or an upset stomach. It also raises blood pressure. In daily life, it can look like this:

• Your heart thumps or races after the third cup.

• You get acidity or a burning feeling after tea on an empty stomach.

• You wake up with a headache on Sundays, when the office chai is missing.

That last one is a clue that your body now expects caffeine. MedlinePlus lists dependency, where you need more to get the same effect, among the signs of too much. Do not just blame the chai if your heart races. The NHS says to see a GP if palpitations keep coming back or happen more often, last longer than a few minutes, or you have a heart condition or a family history of heart problems. It says to call an ambulance (112 in India) or go to an emergency department if palpitations do not go away or come with chest pain, shortness of breath or feeling faint or fainting. Our guide on what can raise your resting heart rate at night covers other causes.

Tea with meals and your iron

This part is easy to miss. Tea does not only bring caffeine. It also carries polyphenols, plant compounds that can bind iron in your food.

In a study published in the British Journal of Nutrition, adults ate a bread meal with different drinks. Compared with water, black tea reduced iron absorption from the meal by 79 to 94 percent. Coffee and herbal teas reduced it too. Adding milk to tea or coffee made little or no difference, so milky chai is not exempt.

The study looked at non-haem iron, the kind found in dal, rajma, greens, roti and other plant foods. That is a major iron source on Indian plates, especially vegetarian ones. It also measured single meals, so it tells you about timing rather than proving that every tea drinker becomes anaemic.

The practical step is easy. Have your chai between meals rather than with breakfast, lunch or dinner. This matters most if you are a woman with heavy periods, pregnant, vegetarian or taking iron tablets. If you often feel breathless, pale or exhausted, read about iron deficiency in women and when to get tested.

The sugar in chai adds up quietly

Two teaspoons of sugar in each of five cups is ten teaspoons a day before you have eaten a single biscuit. The World Health Organization advises keeping free sugars under 10 per cent of daily energy, which is about 50 g or 12 level teaspoons a day for an adult eating around 2000 calories. It adds that going further, to 5 per cent or less, may bring extra health benefits. Your chai alone can use up most of that allowance, leaving no room for sweets, juice or the mithai at a family function. Cutting one teaspoon per cup may be easier than cutting a cup. Once the first change feels normal, take out another spoon. If you find you need something sweet with every cup, our Aora guide on why you crave sugar all the time may explain the pattern.

Why the evening cup costs you sleep

Caffeine reaches its peak level in your blood within an hour of a cup. You may feel the effects for four to six hours. But feeling it and clearing it are not the same thing. Doctors use the word half-life for the time your body takes to clear half of a dose. After that, the other half is still working. So a 4 pm chai is still partly in your system when you lie down at 11. MedlinePlus notes that some people are more sensitive to caffeine than others. A 2023 review of 24 studies found caffeine cut total sleep time by 45 minutes on average. The authors calculated that a cup of coffee with about 107 mg of caffeine should be had at least 8.8 hours before bedtime to avoid losing sleep. If you sleep at 11 pm, that means your last coffee by about 2 pm. Tea has less caffeine, so a light cup at 4 may be fine for many people, but the 8 pm cup is the one to drop first. If you already wake at 3 am and stare at the ceiling, caffeine is only one possible cause. This guide on why you keep waking up at night covers the others.

How to cut down without the headaches

Stopping suddenly is what can bring on withdrawal symptoms. A review of caffeine withdrawal research found that headache appeared in 50 percent of people tested in experimental studies. Other symptoms the review confirmed include tiredness, low mood, poor concentration, irritability and a foggy head. Symptoms usually began 12 to 24 hours after the last dose, peaked at 20 to 51 hours and lasted 2 to 9 days. Even people stopping as little as 100 mg a day had symptoms.

So go slowly:

1. Drop the latest cup of the day first. It is the one most likely to cost you sleep.

2. Every few days, remove or shrink one more cup. Swap a big mug for a small glass.

3. Make some cups half-strength with fewer leaves or a shorter boil.

4. Replace one cup with something warm that has no caffeine, such as ginger water, tulsi, jeera water or plain hot milk.

5. Keep the ritual. The 4 pm break with colleagues matters as much as the drink in it.

When to talk to a doctor

MedlinePlus advises asking your doctor whether you should limit or avoid caffeine if you are pregnant or breastfeeding, have sleep disorders including insomnia, have migraines or other chronic headaches, have anxiety, have acid reflux (GERD) or ulcers, have a problem with the rate or rhythm of your heartbeat, have high blood pressure or take certain medicines or supplements, including stimulants, certain antibiotics, asthma medicines and heart medicines. It adds that children and teens should not have as much caffeine as adults, as children can be especially sensitive to it. Also check the label on cold and headache tablets, since some pain relievers and cold medicines contain added caffeine.

You don’t have to give up your morning chai to cut back on caffeine. Start by keeping track of how many cups you drink in a day. Maybe you could skip that extra cup at work, have your evening tea a little earlier or gradually reduce the sugar you add. If you are concerned about iron absorption, leave some time between your tea and meals. Small changes can make a difference without taking away something you enjoy. After all, it’s not about giving up chai. It's about knowing how much works for you.

Sources

• Caffeine (MedlinePlus, US National Library of Medicine)

• Caffeine: scientific opinion on the safety of caffeine (European Food Safety Authority)

• Foods to avoid in pregnancy (NHS)

• Inhibition of non-haem iron absorption in man by polyphenolic-containing beverages (British Journal of Nutrition, 1999)

• The effect of caffeine on subsequent sleep: A systematic review and meta-analysis (Sleep Medicine Reviews, 2023)

• A critical review of caffeine withdrawal: empirical validation of symptoms and signs, incidence, severity and associated features (Psychopharmacology, 2004)

• Healthy diet fact sheet (World Health Organization)

Medical Disclaimer: This article is for general information and is not a substitute for advice from your doctor. Speak to a qualified healthcare professional before starting any supplement, especially if you are pregnant, breastfeeding or taking medication.