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The Impact of Supplements on Kidney Function

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Dietary supplements are beneficial, but renal disease patients should use them carefully. Supplements can impair and reduce renal function.

Medically reviewed by

Dr. Anshul Varshney

Published At February 1, 2024
Reviewed AtFebruary 1, 2024

Introduction

Over the past few years, individuals have been looking for ways to improve their health and well-being, which has increased the popularity of dietary supplements. There are a lot of supplements that can be helpful, but there are also those that can be harmful to the body, particularly if they are taken in excessive amounts. In particular, the effects of dietary supplements on the kidneys are a cause for concern. This is because the kidneys are essential organs for filtering waste materials out of the body. Nutritional supplements can be found in many shapes, sizes, and formulations. Specific approaches prioritize the inclusion of a single nutrient in the dietary intake, while others are designed to incorporate multiple nutrients through a multivitamin. Furthermore, numerous botanical products might be classified as nutritional supplements.

Are Dietary Supplements for the Kidneys Safe?

Certain supplements should be avoided by those with compromised renal health, particularly those with chronic kidney disease. The inclusion of vitamins A, D, E, and K in these supplements is because they can accumulate in the body. Renal dysfunction resulting from chronic kidney disease impairs the kidneys' capacity to eliminate this further accumulation effectively. Additionally, one may need to modify the supplements one takes to begin dialysis. Consult a physician for additional guidance on what to avoid in light of one’s health and circumstances.

As every individual is unique, it is crucial to consult a physician. They possess the exclusive authority to ascertain the safety of supplements, medications, vitamins, and other substances for one’s consumption. In addition, a physical examination, urine analysis, and blood work will be conducted by a physician to determine the efficacy of one’s dietary supplement regimen. In addition to monitoring the kidney function, these examinations enable a physician to modify the medications as necessary.

The manifestations of renal disorders can differ based on the specific type and extent of the ailment. Typical manifestations encompass:

  • Tiredness.

  • Edematous ankles or feet.

  • Dyspnea.

  • Emesis and emetic reflex.

  • Urinary frequency or urinary retention.

  • Hematuria.

  • The discomfort experienced in the lateral or posterior region of the body.

What Is the Diagnosis for Kidney Diseases?

The diagnosis of kidney illnesses typically entails a comprehensive approach that includes physical examinations, analysis of blood and urine samples, and imaging studies. The specific examinations and protocols may differ based on the presumed classification of renal ailment.

  • Physical Examination: The physician will assess the patient for any indications of edema or accumulation of fluid, particularly in the lower limbs and ankles.

  • Hematological and Urinalysis Examinations: These examinations can quantify concentrations of metabolic byproducts in the bloodstream and urine while detecting infection or inflammation.

  • Imaging Modalities: X-rays, ultrasounds, and CT scans are employed to assess the kidneys and detect any irregularities.

What Effects Do Dietary Supplements Have On the Kidneys?

Certain kidney supplements consumed through food can potentially cause detrimental effects on the kidneys, which are vital organs responsible for filtering waste products from the blood and maintaining the body's fluid and electrolyte balance. The following is a list of some of the impacts that renal supplements in the diet have on the kidneys:

  • Vitamin C in High Doses: Even though vitamin C is a vital ingredient for the body, taking excessive amounts of vitamin C supplements may significantly increase the likelihood of developing kidney stones. Vitamin C can be turned into oxalate, a chemical that can combine with calcium to produce kidney stones; this is why kidney stones can be formed.

  • Supplements Containing Creatine: Creatine is a well-known dietary supplement that is regularly utilized by athletes in order to enhance their muscle strength and performance. High quantities of creatine supplements, on the other hand, have the potential to harm the kidneys and increase the likelihood of developing kidney stones. This is because creatine has the potential to boost the metabolism of waste materials within the body, which can lead to an overflow of the kidneys.

  • Supplements Made From Herbs: Ephedra and St. John's Wort are two examples of herbal supplements linked to negative effects on the kidneys, including kidney damage and kidney failure. As these supplements may contain compounds that are harmful to the kidneys or that disrupt the normal functioning of the kidneys, this is the case.

  • Iron Supplements: Iron is a mineral necessary for the body, but taking an excessive amount of iron supplements can lead to an iron overload in the body, which can cause damage to the kidneys. This is because the kidneys are in charge of filtering the blood and controlling the iron in the blood.

  • Protein Supplements: Athletes and bodybuilders frequently utilize them to grow muscle mass and improve performance. On the other hand, protein supplements might cause the kidneys to work harder than they normally would, eventually resulting in renal damage if taken in excessive amounts.

What Are the Optimal Dietary Choices for Promoting Kidney Health?

Adopting healthy lifestyle behaviors is crucial for optimizing kidney health. Although quitting smoking, consuming alcohol in moderation, and increasing physical exercise can enhance overall kidney health, modifying one’s diet is the most straightforward lifestyle adjustment one can implement.

For many years, doctors advised following a renal diet that restricted the intake of sodium, potassium, and phosphorus. The issue was that this diet also diminished the consumption of vital food groups such as fruits, vegetables, whole grains, legumes, and nuts. Recent studies indicate that individuals with or at risk of chronic kidney disease (CKD) may consider adopting well-balanced diets such as the Mediterranean diet or the DASH diet. These healthy diets prioritize using whole, minimally processed foods and advocate for consuming protein in low to moderate quantities. Consequently, they promote kidney well-being and mitigate the likelihood of associated health complications such as hypertension, cardiovascular disease, obesity, and diabetes.

Consuming a sufficient amount of fluids, especially water, aids in the elimination of sodium and toxins from the kidneys. Strive to consume a minimum of two liters of water each day, and increase this amount if one resides in a warm area, engages in moderate to vigorous physical activity, or has a past medical record of kidney stones.

Conclusion

In summary, although dietary supplements may offer various health advantages, their use should be approached with prudence, especially by those who have kidney disease. Specific supplements have the potential to impair renal function and, in extreme circumstances, induce renal injury. Therefore, It is crucial to consult a healthcare professional before consuming any dietary supplements and verify that such supplements are appropriate and secure for the individual's kidney condition and general health.

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Dr. Anshul Varshney
Dr. Anshul Varshney

Internal Medicine

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