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A renal diet is a diet aimed at keeping levels of fluids, electrolytes, and minerals balanced in the body in individuals with chronic kidney disease or who are on dialysis. Dietary changes may include the restriction of fluid intake, protein , and electrolytes including sodium , phosphorus , and potassium . [ 1 ]
There are some nutrients that are restricted in kidney 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.
This diet is not the dialysis diet, [56] which is completely different. The healthy kidney diet restricts large amounts of protein, which are hard for the kidney to break down, but especially limits potassium and phosphorus-rich foods and beverages. Liquid intake is often limited as well. [55] [57]
Partial fluid restriction can be used as therapy, but has the disadvantages of being difficult to maintain, and it is often ineffective. [6] Drugs causing increased diuresis ( diuretics ) is generally an alternative, and have less risk of causing decreased glomerular filtration rate through the kidneys and resultant decreased kidney function .
The DASH diet (or combination diet) was rich in potassium, magnesium and calcium—a nutrient profile roughly equivalent with the 75th percentile of U.S. consumption. The combination or “DASH” diet was also high in whole grains, poultry, fish, and nuts while being lower in red meat content, sweets, and sugar-containing beverages. [27]
A low-protein diet is a diet in which people decrease their intake of protein. A low-protein diet is used as a therapy for inherited metabolic disorders, such as phenylketonuria and homocystinuria , and can also be used to treat kidney or liver disease.
A low sodium diet has a useful effect to reduce blood pressure, both in people with hypertension and in people with normal blood pressure. [7] Taken together, a low salt diet (median of approximately 4.4 g/day – approx 1800 mg sodium) in hypertensive people resulted in a decrease in systolic blood pressure by 4.2 mmHg, and in diastolic blood pressure by 2.1 mmHg.
Fluid restriction to minimize the risk of edema (if not already present) or to reduce any active edema that may be present. [39] A special diet during the hospital stay that restricts sodium, potassium, and fluids in conjunction with the previously mentioned fluid restriction in an attempt to control symptoms of fluid overload. [40]