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Impact of Cranberry Juice Consumption on Risk Factors for Kidney Stones

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Cranberry juice may raise the risk of uric acid and calcium oxalate stones, especially if one has a history of kidney stones. Read further to know more.

Medically reviewed byDr. Yash Kathuria

Published At July 16, 2024
Reviewed AtJuly 16, 2024

Introduction:

Studies reveal that contrary to popular belief, cranberry juice may promote the development of kidney stones. One cup or less of cranberry juice per day is a reasonable limit. Instead, one might want to try orange, lemon, apple, or black currant juices. About one in 11 persons suffer from the common condition known as kidney stones. Kidney stones can have a variety of causes, but food is a big one. Cranberry juice, for instance, is believed to help dissolve kidney stones in the same way that it lowers the risk of urinary tract infections (UTIs). However, other specialists contend that consuming cranberry juice can potentially make kidney stones worse. One could not know what to believe or be confused, resulting in differing viewpoints. This article explains if drinking cranberry juice can help prevent kidney stones or if it is best to avoid it altogether.

What Are Kidney Stones?

Kidney stones are hard deposits of minerals and salts that develop inside the kidneys. They are sometimes referred to as renal calculi, nephrolithiasis, or urolithiasis. Kidney stones can have many causes, including diet, obesity, certain medical disorders, and certain vitamins and drugs. They can impact the kidneys, bladder, and other urinary tract organs. When pee gets concentrated, minerals can crystallize and adhere to one another, which is often how stones originate.

What Are the Causes of Kidney Stones?

A few of the causes are as follows:

  • Chronic dehydration (due to inadequate fluid consumption or excessive perspiration).

  • Intake a diet rich in fructose, salt, sugar, phosphoric acid, oxalates, and protein.

  • Overweight/ obesity.

  • Particular medications (such as potassium channel blockers, diuretics, laxatives, sulfonylureas, and antibiotics).

  • Improper use of some supplements, such as vitamin C.

  • Kidney stones genetics and family history.

  • Recurring urinary tract infections.

  • Comorbidities (such as hyperparathyroidism (a very high level of parathyroid hormone in the blood, which causes the bones to deteriorate from calcium loss), nephrocalcinosis (defined by the kidney's parenchyma and tubules accumulating calcium salts), sarcoidosis (a disorder where the immune system overreacts and forms granulomas, which are lumps or nodules), gastrointestinal disorders, gout (urate crystals build up in joint, resulting in gout attacks, which are characterized by extreme pain and inflammation), high blood pressure, and non-alcoholic fatty liver disease).

  • Specific surgical techniques include gastric bypass (a weight-loss surgery in which a tiny pouch is constructed from the stomach and then directly connected to the small intestine).

What Is the Composition of Kidney Stones?

The composition of the kidney stones is as follows:

  • Calcium Oxalate Stones: When calcium and oxalate mix in the urine, calcium oxalate stones are created.

  • Struvite Stones: Phosphorus, ammonium, and magnesium make up struvite stones.

  • Uric Acid Stones: Linked to specific diets and ailments such as gout.

  • Dehydration: Promotes mineral crystallization.

What Are the Symptoms of Kidney Stones?

As a kidney stone moves from the kidneys to the bladder, a person with kidney stones may experience:

  • Back or stomach pain.

  • Hematuria (blood in their urine).

  • Nausea and throwing up.

  • Malaise and fatigue.

  • Fever and chills.

Can Those Who Have Kidney Stones Consume Cranberry Juice?

Research on using cranberry juice to cure kidney stones is conflicting. Furthermore, much of the earlier research on the possible connections between cranberry juice and kidney stones calls for further investigation. Cranberry juice contains a lot of oxalates, which may raise the risk of kidney stones caused by calcium oxalate. This is because oxalates, especially if the patients are already at risk for kidney stones, bind to calcium when consumed in excess. Furthermore, an earlier study discovered that cranberry juice reduced the excretion of citric acid in the urine, which can lead to kidney stones. However, an earlier study discovered that cranberry juice did not affect levels of citric acid.

Additionally, some research suggests that cranberry juice may make urine more acidic by lowering its pH. Elevated acidity has been linked to increased uric acid and calcium oxalate stones. Given that struvite and brushite stones are less likely to form in acidic conditions, it is interesting to note that cranberry juice lowered relative supersaturation risk (RSR) scores for these types of stones.

However, in contrast to other studies, an earlier study discovered that cranberry juice raises urine pH (a measurement of water's acidity or basicity) and lowers relative supersaturation risk (RSR) for calcium oxalate stones. According to the majority of research currently available, the effects of cranberry juice may vary depending on the kind of stones one often gets. Restricting or staying away from cranberry juice could be advisable if one is prone to uric acid and calcium oxalate stones.

What Are the Benefits and Drawbacks of Cranberry Juice?

The immune system may be strengthened, gut health may be supported, and urinary tract infections (affecting any urinary system component) may be prevented and treated with cranberries and cranberry juice. However, kidney stones might work against an individual. Large quantities of oxalate, a major component of the most common kidney stones made of calcium, are found in cranberries. However, because brushite kidney stones are less prevalent than other types, cranberry juice can prevent them by reducing urine's pH (a measurement of water's acidity or basicity). Remember that cranberries are inherently very bitter and that cranberry juices are high in sugar and contain relatively little cranberry. This can present its own unique set of issues, particularly for people who have diabetes or other metabolic problems.

What Are Kidney Stone Remedies Other Than Cranberry Juice?

If cranberry juice is not the thing, several more nutritious options exist. According to current research, since citric acid may suppress the formation of kidney stones, drinking juices high in citric acid may lower the chance of acquiring calcium oxalate kidney stones. Additionally, it could raise the pH of the urine, making it more alkaline. Orange juice is ideal because of its alkalizing and citric acid content. Lemon and black currant juices might also benefit those prone to uric acid or calcium oxalate stones. Since apple juice contains a lot of malic acid, a precursor to citrate, it could also be an acceptable substitute, but further study is required.

Conclusion:

Urine's compounds can cause hard crystals known as kidney stones. Chronic dehydration, food, genetics, drugs, and other aspects of lifestyle are frequently the cause of them. Although cranberry juice has long been believed to help prevent kidney stones, evidence from studies suggests that it may accelerate the development of kidney stones, particularly calcium oxalate stones, the most frequent type. The daily juice consumption should ideally be kept to no more than one cup. Given the lower incidence of kidney stones associated with citrus juices (such as orange, black currant, and lemon), one might be better off sticking to apple juice.

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