Vitamin and mineral supplementation for dialysis patients Energy

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When healthy, the kidneys are responsible for the continuous filtration of blood in order to maintain fluid, electrolyte, and organic solute balance in the body. However, when the kidneys are damaged, they are no longer able to do this. Dialysis, used in end stage renal disease (also referred to as renal failure, chronic kidney disease, and kidney failure), it is a process where a machine filters the blood since the kidneys are no longer able to. In addition to the inability to filter blood, renal failure results in the body's inability to make some vitamins and minerals (example: vitamin D), as well as difficulty excreting excessive amounts of certain vitamins and minerals (example: phosphorus).


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The kidney's role in vitamin and mineral metabolism

Normally, we are able to get adequate amounts of vitamins and minerals by eating a wide variety of foods. However, many patients on dialysis must follow dietary restrictions, making it difficult for them to get the necessary amounts of certain vitamins and minerals to stay healthy. In addition to this, many vitamins and minerals are lost during the process of dialysis. Therefore, many dialysis patients are at risk for vitamin and mineral deficiencies. Since vitamins are necessary for proper metabolism, protein building, and growth it is important for the health of dialysis patients that they are supplemented with any vitamins or minerals that they may be deficient in.


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General overview of vitamins and minerals

Vitamins can be divided into two groups: water-soluble vitamins and fat-soluble vitamins. Water-soluble vitamins include vitamin C and the B vitamins (folate, thiamine, riboflavin, niacin, pantothenic acid, biotin, vitamin B6, vitamin B12). Most dialysis patients will need to supplement vitamin C and B vitamins to replace what is lost in the dialysis solution. Fat-soluble vitamins include vitamins A, D, E, and K. Excessive amounts of these vitamins can be harmful for people with kidney failure because they can build up in the body and become toxic so they are not generally supplemented in dialysis patients. However, vitamin D is sometimes an exception to this generalization. A doctor will prescribe vitamin D if it is necessary.


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Nutrients to avoid in dialysis

There are some nutrients that are restricted in renal failure patients because of the body's inability to excrete excessive amounts of them due to the kidneys not functioning properly. In general, these nutrients include:

  • Potassium: The kidneys help to regulate potassium levels. When the kidneys are damaged, potassium levels can become elevated. Elevated potassium levels can cause the heart to beat irregularly or even stop.
  • Phosphorus: The kidneys also help to regulate phosphorus levels in the body. When the kidneys are damaged, they aren't able to remove excessive phosphorus, causing it to build up in blood. Your doctor may prescribe a phosphate binder that is taken with meals to help remove excess phosphorus
  • Sodium: In patients with renal failure, sodium can cause excessive fluid retention, which can lead to elevated blood pressure, edema, heart failure, and shortness of breath.
  • Fluid: As kidney damage worsens so does the ability to excrete fluid. In kidney failure patients, excessive fluid intake can result in the same conditions that excessive sodium intake does.

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Vitamins and minerals to supplement in dialysis

Many foods that contain phosphorus and potassium (restricted in dialysis patients) also contain folate, niacin, riboflavin, and vitamin B6 (water-soluble vitamins). Therefore, restricting foods that contain phosphorus and potassium can lead to deficiencies in other important vitamins. In general, the following vitamins and minerals are supplemented in dialysis patients:

  • B vitamins- Water-soluble vitamins that play a role in red blood cell development to prevent anemia and contribute to metabolism to help change the foods you eat into energy.
  • Vitamin C- Water-soluble vitamin that aids in keeping tissues healthy, wound healing, and infection prevention.
  • Vitamin D- Normally, the kidney changes vitamin D into its active form, vitamin D3, which helps you absorb calcium. Many dialysis patients have low intakes of calcium due to avoidance of foods containing phosphorus and potassium. Lack of calcium can lead to renal osteodystrophy (bone weakening). On the other hand, too much calcium can cause calcification or calciphylaxis (calcium deposits in places such as the heart. Vitamin D is a fat-soluble vitamin, meaning that excessive amounts can be damaging so it should be prescribed and monitored by a doctor.
  • Iron- Kidney damage results in inability of the kidney to produce erythropoietin, which stimulates red blood cell production.

Nutrition for patients on dialysis varies on an individual basis. It can be very confusing trying to determine which vitamins and minerals need to be supplemented and which do not so it is important for dialysis patients to speak with a doctor before making any changes to their nutritional plan.

Source of the article : Wikipedia



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