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Does Iced Tea Cause Kidney Stones

Drinking Iced Tea Increases The Risk Of Kidney Stones: Research

Can Iced Tea Cause Kidney Stones?

Tuesday, August 7 -People who drink iced tea may be at increased risk of developing painful symptoms Kidney stone, New research shows.

Researchers at Loyola University Medical Center explained that popular summer drinks contain high levels of oxalate. mineral Salt contained in urine. These crystals are usually harmless, but researchers warned that they could grow large enough to stay in a small tube that drains urine from the kidneys into the bladder.

For those who tend to form the most common type Kidney stoneIce tea is one of the worst things to drink, Dr. John Milner, an assistant professor of urology at Loyola University Chicago Strich School of Medicine, said in a news release. Its summer iced tea, but dont overdo it. As with many things related to a healthy lifestyle, moderation is key.

Dehydration is the most common cause of kidney stones, the study authors pointed out. However, drinking iced tea can increase peoples risk of the condition.

People are said to drink more water during the summer, Milner said. Many people choose to drink more iced tea because its low in calories and tastes better than water, but when it comes to kidney stones, they may hurt themselves.

Men are four times more likely to develop kidney stones than women. The risk is significantly higher for men over the age of 40. However, the researchers say: Postmenopausal Women with low estrogen levels and women with ovaries removed are also at increased risk.

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Not Sweet: Too Much Iced Tea Causes Kidney Failure

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Drinking tea is good for your health. It may lower the risk of cancer, it can encourage weight loss, and recent studies have shown tea can help lower blood pressure.

But one Arkansas man discovered there can be too much of a good thing.

In May 2014, a 56-year-old man arrived at Central Arkansas Veterans Healthcare System, complaining of weakness, fatigue and body aches. Doctors discovered that his kidneys were failing. He was placed on dialysis. After questioning the patient, they learned that he drank 16 8-ounce glasses of iced tea daily, which is about 1 gallon.

Iced tea is full of oxalic acid, which, when taken in excess, deposits in your kidneys and mucks up the work of removing waste from the blood, says Scott Youngquist, MD, an emergency physician at University of Utah Health. This patient was drinking 16 8-ounce glasses of iced tea per day for an unknown period of time. This created a load of oxalic acid that his kidneys couldn’t handle, leading to renal failure.

Black tea is rich in oxalate, a compound found naturally in many foods. Too much of it can also lead to kidney stones. The man likely consumed 1,500 milligrams of the compound daily. As a comparison, the average person ingests between 150 and 500 milligrams of oxalate each day.

This kind of kidney failure has also been reported due to excessive consumption of star fruit, cucumber fruit, rhubarb and peanuts, Youngquist says.

Research On Green Tea

Although more research is needed, much research shows that green tea can help ward off kidney stones before they occur. According to a November 13, 2009 article in, green tea contains compounds called “phenols” that make it more difficult for large kidney stones to form by changing the shape of the mineral crystals so they cannot clump together 2. A study in the May 2006 “Journal of Endourology” reported that epigallocatechin gallate, one of the main polyphenols in green tea, inhibited urinary stone formation in rats through its antioxidant effects 34. In the January 2005 edition of Journal of Urology, researchers reported that green tea decreased calcium oxalate stone formation in rats, alleging that this correlation was likely due to the antioxidants in the tea 3.

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Is Tea Bad For Your Kidneys

While drinking too much of iced tea may damage your kidney, there are a few healthy teas that can work as kidney cleansing teas. Here are a few best teas for kidneys:

  • Dandelion tea
  • Ginger and turmeric tea
  • Green tea.

Drinking herbal tea for kidneys is also a good idea when youre looking to detox your kidney.

Is It Ok To Drink Tea With Milk

Drink a Lot of Iced Tea? Watch Out for Kidney Stones ...

Tea, especially black and green varieties, is rich in compounds that act as antioxidants and may help lower blood pressure and cholesterol levels, among other benefits. Some studies suggest that adding milk to tea may inhibit the activity of these compounds, while others have observed the opposite effect.

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Effects Of Caffeine Consumption On Kidney Stone Disease

Although the effects of caffeine on the kidney have been extensively studied, its influence in kidney stone disease seems to be overlooked. The evidence on whether caffeine prevents or promotes kidney stone disease has recently become more clear. Because an increase in fluid intake is widely recommended for the prevention of kidney stone formation, some previous studies during the past 2 decades focused on the relevance of the type of consumed beverages, including caffeinated beverages, in association with kidney stone incidence. In 1996, the first cohort data retrieved from the Health Professionals Follow-Up Study in 45,298 male participants who had no history of kidney stones were reported . The findings showed that not all types of beverages affect kidney stone disease. Only caffeinated coffee and decaffeinated coffee and tea, but not caffeinated and noncaffeinated sodas, are associated with an 10% lower risk of kidney stone incidence .

In 1998, the Nurses Health Study , another cohort study in 81,083 female participants who had no history of kidney stones reported the association between beverage consumption and a lower risk of kidney stone disease . The data showed a 10%, 9%, and 8% lower risk of kidney stone formation in the participants who consumed caffeinated coffee, decaffeinated coffee, and tea, respectively .

Does Green Tea Cause Kidney Stones

As mentioned above, a 2019 study has shown that drinking green tea is associated with a lower risk calcium-oxalate stones. This benefit was observed more strongly in men .

As the story unfolds, researchers are discovering that it is not only about the amount of oxalate in the tea but also about how the oxalate works to form crystals in the presence of tea compounds.

Compounds in tea can influence how the calcium-oxalate molecules bind together and how stable the resulting crystal is. Less stable crystals are easily broken down by the body.

Our data show no evidence for increased stone risk factors or oxalate-dependent stones in daily green tea drinkers

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Caffeine And Its Popularity

Caffeine is a popular stimulant worldwide that is frequently consumed to enhance mood, alertness, muscle endurance, and exercise performance. Caffeine is a naturally occurring alkaloid found in seeds and leaves of several types of plants . The amount of caffeine content in each plant varies, depending on the type of plant, its growth environment, and the preparation or brewing method. For example, Robusta coffee usually has a higher caffeine content than Arabica coffee . In addition, the roasted temperature and pressure can influence caffeine content in the coffee .

Tea And Ice Cream Kidney Stones

Does matcha green tea cause kidney stones? / Kidney Stone Diet Podcast with Jill Harris

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Mayo Clinic Q And A: Reducing Your Risk Of Kidney Stones

Dear Mayo Clinic: My father has a history of kidney stones. He has changed his diet in the past year, which seemed to help. I’m concerned though, since I had heard kidney stones can increase during the summer. Is this true? If so, are there any tips for how he can further reduce his risk?

Answer: As temperatures rise during the summer months, so does the risk of developing kidney stones, even if you have never had one before. There are several reasons why there is a rise in kidney stones during the summer months. Among these reasons are an increase in outdoor activities, and the amount and types of food and drink we consume.

Research shows that as the weather warms up, people spend more time outdoors, doing yardwork, spending time at the pool or around a barbeque. And often the body is not getting the type of fluids it needs while losing more than normal via the skin.

Kidney stones are hard deposits of minerals and salts that form inside your kidneys. They develop when your urine contains more crystal-forming substances, such as calcium, oxalate and uric acid, than the fluid in your urine can dilute.

There are several causes for kidney stones, including diet, which can play a significant role in the formation of kidney stones. A family or personal history of kidney stones raises your risk, as do certain medications and medical conditions.

Kidney Stone Diet Plan And Prevention

If you have kidney stones, you may need to follow a special diet plan. First, your healthcare professional will run blood and urine tests to find out what kind of risk factors you may have. Then your healthcare professional will tell you the diet changes and medical treatment you need to prevent having kidney stones come back.

A registered kidney dietitian can help you make the necessary changes in your diet plan and lifestyle.

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Final Verdict Is Green Tea Good Or Bad For Your Kidneys

As already discussed, scientific research has established that green tea helps in preventing kidney stones from forming a larger shape. This allows them to easily pass through the urinary tract.

Apart from that, EGCG in green tea helps prevent chronic kidney disease. This implies that green tea is definitely good for the kidneys.

Caffeine Absorption Metabolism And Elimination

This Powerful Tea Helps Remove Kidney Stones

After oral intake, caffeine is rapidly and completely absorbed from the stomach and small intestine into the blood circulation, and is then distributed to almost all tissues and body fluids. The peak plasma concentration of caffeine is 810 mg/L, which is reached within 15120 min after its intake , whereas its half-life is 5 h . It is metabolized in the liver by cytochrome P450 to become metabolite products, including paraxanthine , theobromide , and theophylline . These dimethylxanthine compounds are then demethylated to monomethylxanthine and finally oxidized to methyl uric acid and other end products . Whereas the majority of the consumed caffeine is metabolized to become various end products as previously mentioned, the remaining amount is intact and directly excreted into the urine without accumulating inside human body .

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Tea And Kidney Stones

Tea is often listed on the avoid food/beverage list for helping to prevent kidney stones. Someone who was told to avoid tea after a recent bout with kidney stones, asked me whether this includes ALL types of teas

The reason tea is listed on the AVOID list for oxalate-containing kidney stones is because they are considered to be oxalate-containing beverages. But is there a difference in oxalate content between the different types of tea?

In a journal article I found, the researches tested an assortment of teas for oxalate content. They found that soluble oxalate contents of black tea in tea bags and loose tea leaves were 4.68 and 5.11 milligrams per gram of tea. Green teas and oolong tea had lower oxalate amounts, ranging from .23 to 1.15 milligrams per gram of tea. The oxalate content of the herbal teas they tested ranged from not detected to 3 milligrams per gram of tea.

Anyone with kidney stones should check with their doctor or specialist first, but it appears that herbal and green teas may be a great option for someone who has a history of oxalate kidney stones but finds comfort and enjoyment in an occasional cup of tea.

Teas That Are Okay For You

9. Rosehip Tea

Rosehip tea has a variety of benefits, ranging from antioxidant properties to boosting your immunity. There are different reasons to drink this herbal tea.

But, it does contain a moderate amount of oxalates. So, if you are sensitive or already have kidney stones you may want to practice moderation when drinking this tea.

10. Yerba Mate Tea

Additionally, if you enjoy the South American Yerba Mate tea you may want to limit your daily consumption. It, as previous, contains a moderate amount of oxalates. So, despite being a stimulating alternative to coffee, you may rearrange your regime to avoid excess consumption.

11. Black Currant Tea

Lastly, black currants have a moderate amount of oxalates. So, if you enjoy this flavored tea you may want to be careful about how much you drink.

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What Teas Are High In Oxalates

In a study from 2012, here are some findings from teas that are high in oxalate.

The results showed that the highest of oxalate content was found in black tea , followed by oolong tea , green tea and the lowest was found in white tea .

The mean soluble oxalate contents of black tea in tea bags and loose tea leaves were 4.68 and 5.11 mg/g tea, respectively, while green teas and oolong tea had lower oxalate contents, ranging from 0.23 to 1.15 mg/g tea. The soluble oxalate content of the herbal teas ranged from not detected to 3.00 mg/g tea.

How To Reduce Oxalate In Your Diet

Kidney stone prevention, Tea drinking, America Now Dr. Lee Hammontree

Cleveland Clinic suggest these 6 steps to control oxalate for kidney stones:

Six steps to control oxalate for kidney stones

  • Eat fewer high-oxalate foods.
  • Increase the amount of calcium in your diet.
  • Limit the vitamin C content of your diet.
  • Drink the right amount of fluids every day.
  • Eat the right amount of protein daily.
  • Reduce the amount of sodium in your diet.
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    How Much Tea Is Too Much

    Most herbal and green teas are safe to consume in larger amounts, however you may want to be more conservative if drinking darker, fermented teas such as black tea or puerh.

    Black can still be beneficial in moderate amounts. A 2002 study in the Journal of Epidemiology found that 8 oz of tea consumed daily actually reduced the risk of stone formation by 14% .

    Moderation is key when consuming tea. A recent case study from the Central Arkansas Veterans Healthcare System described a patient that had drank 16, 8 ounce glasses of iced tea daily and had to be put on dialysis because his kidneys had stopped functioning . Although important to drink enough, remember water can also be toxic when consumed in large quantities!

    Who’s At Risk For Kidney Stones

    The prevalence of kidney stones in the United States is growing from 5.2 percent in the mid-1990s to 8.8 percent in 2010, according to data from a nationwide survey presented in May at the American Urological Association meeting but experts can’t explain why.

    Similar data suggests men are more prone to kidney stones than women especially after age 40 and kidney stone prevalence among women peaks in their fifties, according to the National Kidney and Urologic Diseases Information Clearinghouse .

    People who’ve had kidney stones once are more likely to get them again, and those whose family members have a history of kidney stones also face a higher risk.

    Food and drink, like iced tea, can facilitate formation of kidney stones in susceptible individuals, but scientists don’t believe it does so in people who are not susceptible, according to the NKUDIC.

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    Can Green Tea Cause Kidney Stones

    Kidney stones, hard deposits of minerals and acid salts that form inside the kidneys, can be very painful. Several things can cause kidney stones, including over-concentration of the urine, metabolic or genetic disorders, and infections. Gastric bypass surgery can also increase your chances of developing this condition, because it affects the way your body absorbs calcium and most kidney stones are calcium-based. Green tea is not a cause of kidney stones, according to In fact, it’s quite the opposite this popular herbal tea is often recommended to help prevent them.

    Teas That Are Good For You

    Ice Tea Causes Kidney Stones

    1. Azul Tea

    Azul tea is one of the best teas to drink, especially if you are prone to kidney stones. Its a great alternative to your typical herbal teas. And, its a natural diuretic so it increases the production of urine.

    Increasing your bodys urination may help flush out your kidneys and keep them healthy.

    Also, Azul tea may help prevent calcium oxalate stones from forming. This is due to the isoflavones found in the Palo Azul plant. It is another preventive perk, even if you dont have kidney stones.

    Additionally, Azul tea naturally modulates urine acid levels. So, it may help with urinary tract sediments and other kidney stone issues. This could make the oxalate acid dissolve into the urine and pass from the body, instead of forming painful deposits.

    In contrast, Azul tea has other health benefits as well, like strengthening and maintaining joint health. It may also help detox your body prior to a drug test. Its natural body bolstering and cleansing properties make Azul Tea a highly recommended tea to keep in your kitchen.

    2. Green Tea

    Green tea is generally a good choice for tea lovers. Aside from its low oxalate content, it may also help your body prevent kidney stones from forming, too.

    Calcium oxalate containing stones are one of the most common types of kidney stones. And, its the biggest culprit when you consume too many calcium-rich foods. But, there is an extract in green tea that may help with that.

    3. Goldenrod Tea

    4. Citrus Tea

    5. Dandelion Tea

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