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Is green tea good for kidney?

Green tea has been shown not to have an impact on kidney function. It has also appeared to have a protective effect on the kidneys. Green tea is also high in antioxidants and has been shown to help with weight loss, reducing obesity and associated risks.

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We make it easy for you to participate in a clinical trial for Kidney disease, and get access to the latest treatments not yet widely available - and be a part of finding a cure.

Can you drink black tea if you have kidney disease?

Black tea is a popular beverage and is generally considered good for your overall health. In fact, black tea is protective against diabetes, one of the main risk factors for kidney disease. However, results have varied in studies of people who already have kidney disease. The exact impact of drinking black tea on kidney function and the formation of stones is affected by a lot of variables, including age and sex, baseline kidney function, presence of comorbidities such as diabetes and hypertension, and differences in the tea itself due to different extracts and methods of brewing. Caffeine, the stimulant that is a primary ingredient in some teas and also in coffee, can have both positive and negative effects. Studies¹ have shown that caffeine can protect the kidneys as it has a diuretic effect and may improve the estimated glomerular filtration rate (eGFR), especially in adults over 45. Higher coffee intake (1 to 3 cups a day) was found to be associated with a lower risk of incident acute kidney disease or injury. However, caffeine has a dose-related effect on blood pressure, with higher doses causing an increase in both systolic and diastolic blood pressure in some studies. As hypertension is both a risk factor for and a symptom of kidney disease, excessive caffeine consumption could potentially worsen kidney disease. Studies² have also reported a further decline in kidney function in overweight individuals with metabolic syndrome who consumed more caffeinated drinks. You should talk to your doctor or nutritionist about how much caffeine you should consume in accordance with your health condition and any medications you might be taking. Green and black tea also contain a flavonoid called catechins,³ which is known for significant antioxidant and free radical scavenging activity. Many of the health benefits of tea are likely associated with this chemical, and it may counteract some of the negative effects associated with other components in tea.

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Another class of chemicals found in tea is oxalates, which are also found in potatoes, star fruit, spinach, and leafy greens. Black tea has a high concentration of soluble oxalates, about 4.68 to 5.11mg/g of tea. These oxalates bind to the calcium, forming crystals that turn into kidney stones, and thus consumption of tea might potentially increase your risk of kidney stones. These oxalates also have low bioavailability, meaning that little of them is absorbed, so you will have to consume a lot of tea to risk oxalate toxicity and kidney damage. In a reported case study,⁴ one person managed to do so, but he consumed 16 cups of iced black tea daily, which is 3 to 10 times higher than the recommended tea consumption. Finally, potassium is found in black tea and coffee. Potassium has cardiovascular protective properties, and higher consumption of potassium is associated with lower blood pressure. However, consuming too much potassium can be dangerous if you have kidney disease. Your kidneys may be unable to filter all of it out, which causes hyperkalemia, a condition in which the potassium levels in your blood become too high. Most doctors advise against consuming too much potassium, particularly in cases of kidney disease. However, some recent studies have shown that dietary potassium can also be beneficial as it helps reduce sodium levels. Considering that most people eat a modern diet that is too high in salt and too low in potassium, slightly increasing potassium levels if you also consume a lot of sodium can be beneficial.

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