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Does Tea Dehydrate You?

Tea, a beloved beverage enjoyed by millions worldwide, has long been praised for its taste, aroma, and potential health benefits. However, there’s a common concern among tea enthusiasts: does drinking tea lead to dehydration? In this article, we’ll explore the relationship between tea consumption and dehydration to uncover the truth behind this widely debated topic.

May Affect Your Hydration

Tea may affect your hydration — especially if you drink a lot of it.

That’s largely because some teas contain caffeine, a compound also found in coffee, chocolate, energy drinks, and soft drinks. Caffeine is a natural stimulant and one of the most common food and beverage ingredients in the world (1Trusted Source).Trusted Source

Once ingested, caffeine passes from your gut into your bloodstream and makes its way to your liver. There, it’s broken down into various compounds that can affect how your organs function.

For instance, caffeine has a stimulating effect on your brain, boosting alertness and reducing feelings of tiredness. On the other hand, it can have a diuretic effect on your kidneys.

A diuretic is a substance that can cause your body to produce more urine. Caffeine does this by increasing the blood flow to your kidneys, encouraging them to flush out more water (2Trusted Source).

This diuretic effect can cause you to urinate more frequently, which may affect your hydration more than non-caffeinated beverages.

Different Teas May Have Different Effects

Different teas contain varying amounts of caffeine and may thus affect your hydration differently.

Caffeinated Teas

Caffeinated teas include black, green, white, and oolong varieties.

These teas are made from the leaves of the Camellia sinensis plantand generally provide 16–19 mg of caffeine per gram of tea 

As the average cup of tea contains 2 grams of tea leaves, one cup (240 ml) of tea will have around 33–38 mg of caffeine — with black and oolong containing the most.

That said, the caffeine content of teas can vary from one batch to another, with some providing as much as 120 mg of caffeine per cup (240 ml). It’s also worth noting that the longer you brew your tea, the more caffeine it may contain 

To put this into perspective, one cup (240 ml) of coffee usually provides 102–200 mg of caffeine, whereas the same quantity of energy drink can offer up to 160 mg 

Though tea is lower in caffeine than many other caffeinated beverages, drinking large quantities could affect your hydration status.

Herbal Teas

Herbal teas like chamomile, peppermint, or rosehip are made from the leaves, stems, flowers, seeds, roots, and fruits of various plants.

Unlike other types of tea, they don’t contain leaves from the Camellia sinensis plant. Therefore, they’re technically considered herbal infusions rather than types of tea (5Trusted Source).

Herbal teas are generally caffeine-free and unlikely to have any dehydrating effects on your body.

Hybrid Varieties

Though most herbal teas don’t have any caffeine, a few mixes include caffeine-containing ingredients.

One example is Yerba mate — a traditional South American drink that is gaining popularity worldwide.

It’s made from the dried leaves and twigs of the Ilex paraguariensis plant and contains 85 mg of caffeine per cup on average — slightly more than a cup of tea but less than a cup of coffee.

Although less commonly consumed, herbal infusions including guayusa, yaupon, guarana, or coffee leaves are also likely to contain caffeine.

Therefore, just as is the case with other caffeine-containing teas, drinking large quantities of these teas could reduce your body’s water balance.

Unlikely to Dehydrate You
Despite the diuretic effect of caffeine, both herbal and caffeine-containing teas are unlikely to dehydrate you.

To have a significant diuretic effect, caffeine needs to be consumed in amounts greater than 500 mg — or the equivalent of 6–13 cups (1,440–3,120 ml) of tea (7Trusted Source, 8Trusted Source).

Researchers report that when consumed in moderate amounts, caffeinated drinks — including tea — are as hydrating as water.

In one study, 50 heavy coffee drinkers consumed either 26.5 ounces (800 ml) of coffee or the same quantity of water each day for 3 consecutive days. Comparatively, that’s the approximate caffeine equivalent of 36.5–80 ounces (1,100–2,400 ml) of tea.

Scientists observed no difference in markers of hydration between the days where coffee and water was drunk .

In another small study, 21 healthy men drank either 4 or 6 cups (960 or 1,440 ml) of black tea or identical amounts of boiled water over 12 hours.

Again, the researchers noticed no difference in urine production or hydration levels between the two drinks. They concluded that black tea seems to be as hydrating as water when consumed in amounts smaller or equal to 6 cups (1,440 ml) per day .

In addition, a recent review of 16 studies notes that a single dose of 300 mg of caffeine — or the equivalent of drinking 3.5–8 cups (840–1,920 ml) of tea at once — increases urine production by just 109 ml compared to the same quantity of non-caffeinated drinks .

Therefore, even in cases where tea does increase urine production, it doesn’t cause you to lose more fluids than you originally drank.

Interestingly, researchers note that caffeine may have an even less significant diuretic effect in men and in habitual caffeine consumers 

The Bottom Line

while tea contains caffeine and may have a mild diuretic effect, moderate consumption is unlikely to cause significant dehydration for most individuals.

However, the caffeine content of most teas is very low. Drinking normal amounts — less than 3.5–8 cups (840–1,920 ml) of tea at once — is unlikely to have any dehydrating effects.

As with any dietary choice, it’s essential to listen to your body and adjust consumption accordingly to maintain optimal hydration levels.

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