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5 Products Supporting Renal Function
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Table of Contents 11
The kidneys serve as natural filters within our body. Their role is to ensure proper bodily function by eliminating unnecessary metabolites and toxic substances. Any dysfunction of these organs can lead to serious health consequences, hence the importance of providing them with sufficient hydration and nourishment.
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The functions of the kidneys in the body
The primary functions of the kidneys are the production of urine and involvement in the regulation of water and acid-base balance in the organism. Furthermore, they maintain homeostasis in the body's internal environment by removing excess water, mineral salts, harmful metabolic products, and foreign substances. The functions of the kidneys can be divided into: excretory (elimination of metabolic waste products), regulatory (maintaining body fluid volume, electrolyte balance, and acid-base equilibrium), and endocrine (production of hormones such as renin, erythropoietin, and active vitamin D).
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Orange nectar juice
It substantially reduces the risk of renal stones in various aspects. Incorporating this beverage into the diet increases the amount of consumed fluids. However, even more importantly, orange nectar contains citric acid, which is one of the most potent inhibitors of kidney stone formation. It plays a pivotal role in reducing the calcium level in the urine by forming calcium-citric acid complexes. These are more soluble in urine at a normal pH, thereby decreasing the risk of stone formation. Another factor in favor of orange nectar is its alkalizing effect on urinary pH, which is particularly relevant during the formation of calcium, oxalate, and uric acid stones. The components of the beverage, which also contribute to its protective effects, are substantial amounts of dietary fiber, which is one of the protective factors against stone formation (Y. Barghouthy, B.K. Somani, 2021).
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Pomegranate, a fruit with a significant concentration of active components
It is marked by a substantial concentration of polyphenols, alkaloids, and anthocyanins, which exhibit antioxidant and anti-inflammatory effects. In the context of renal function, pomegranate regulates urine excretion, protecting the kidneys from the harmful and destructive effects of certain substances. It also prevents excessive excretion of calcium in urine, which may contribute to the reduction of risk of kidney stone formation (M. C. Nirumand et al. 2018).
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Parsley
It showcases antioxidant, anti-inflammatory, diuretic, and blood-pressure-lowering qualities. These characteristics are the outcome of its rich content of biologically active components, such as carotenoids, flavonoids, vitamin C, and vitamin E. Consuming parsley contributes to the regulation of urine pH, thereby preventing the formation of kidney stones. Furthermore, it decreases inflammation within the kidneys and bladder and promotes urination, leading to more effective elimination of unwanted substances from the body (M..C. Nirumand et al., 2018).
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Green tea in beverage form
Its protective effect is due to the presence of numerous polyphenols, which are very potent antioxidants, and other phytochemicals naturally occurring in the plant kingdom. Catechins (such as Galusan epigallocatechin) protect the body from the toxic effects of oxalates, so consuming green tea in beverage form can prevent the formation of calcium stones in the kidneys (M. C. Nirumand et al., 2018).
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Oregano herb
Globally employed culinary herb, widely used. Due to its high concentration of plant compounds, such as flavonoids, terpenes, alkaloids, and herbs, apart from flavor attributes, it exhibits health-promoting properties: anti-inflammatory, antioxidant, antibacterial, and diuretic. The extract from the plant's aerial parts has an antioxidant and corrosion-resistant effect, which likely contributes to the anti-urolytic properties of the plant, inhibiting the formation of stones in the urinary system.
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Does an excessive consumption of salt genuinely have detrimental effects on kidney function?
The recommended daily intake of salt is approximately 6 g, equivalent to one teaspoon, which includes salt found in processed products. Excessive consumption can increase the risk of kidney stones. This is due to the tendency to excrete more calcium and protein with urine, which results in a deterioration of kidney function. An excessive amount of salt also disrupts the balance of sodium and potassium in the body, causing the kidneys to be unable to excrete enough water, which can in turn lead to high blood pressure.
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Excessive protein intake
A persistent diet high in protein can lead to a hastened decline in kidney function, manifested by a decrease in GFR (global filtration rate).. This is caused by damage to the renal lining and tubules, which can result in inflammatory kidney disease. Excess protein may contribute to an increase in urinary calcium and a lower pH, potentially leading to a higher risk of developing kidney stones.
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Excessive amount of sugar in diet
An excessive amount of sugar in the diet can lead to overweight, obesity, and insulin resistance, which in turn results in type 2 diabetes. The latter of these diseases is one of the most common causes of chronic renal failure. Particular attention should be paid to fructose, the consumption of which has significantly increased in recent years. Fructose is commonly used as a sweetener in beverages or as a substitute for sucrose and glucose in food. Additionally, the consumption of fructose can increase the risk of developing kidney stones due to its effect on urinary pH, calcium and oxalate excretion, and uric acid metabolism.
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Dehydration
Supplying the suitable quantity of fluids results in a decrease in the concentration of chemicals such as oxalates, phosphates, and urea, which restricts their ability to crystallize. Therefore, it is essential to remind about proper hydration of the body, as lack of fluids facilitates the formation of kidney stones and can lead to kidney damage.
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Summary of the subject concerning kidney care
Caring for kidney health should be part of daily life, not just when the first symptoms of dysfunction appear. Making informed nutritional choices such as consuming more water, a variety of vegetables, fruits, and spices, and reducing salt intake is key. This article lists products that support kidney function and are characterized by high levels of biologically active compounds, anti-inflammatory, antioxidant, and magenic properties. However, maintaining balance in diet is of utmost importance. A diet rich in fresh fruits, vegetables, herbs, and spices constitutes the best method for supporting kidney function.
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Scientifically reviewed by a clinical dietitian
• 18.03.2026
Barghouthy Y., Somani B.K., Role of Citrus Fruit Juices in Prevention of Kidney Stone Disease (KSD): A Narrative Review, „Nutrients” 2021, 13(11), epub. Nirumand M.C. et al., Dietary Plants for the Prevention and Management of Kidney Stones: Preclinical and Clinical Evidence and Molecular Mechanisms, „International journal of molecular sciences” 2018, 19(3), epub. Pachocka L., Dieta wysokobiałkowa – korzystna czy niebezpieczna?, ncez.pzh.gov.pl/abc-zywienia/dieta-wysokobialkowa-korzystna-czy-niebezpieczna/ (16.02.2022). Siener R., Nutrition and Kidney Stone Disease, „Nutrients” 2021, 13(6), epub. Traczyk W.Z., Płyny ustrojowe i czynność nerek, Fizjologia człowieka w zarysie, Warszawa 2013, 366–385.
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