Soy Protein & Kidney Function

Soy protein has shown to be a quality alternative for individuals concerned with kidney health. It's an ideal way to receive necessary protein while avoiding animal-based sources that contribute to other health issues surrounding a decrease in kidney function. Still, consumers of soy must be vigilant.

Challenges

• At all levels of consumption, any type of protein strains kidneys already laboring to do their job, causing a buildup of waste in the bloodstream. This contributes greatly to poor appetite and overall fatigue bringing about a bit of a Catch-22 for individuals facing kidney issues. Protein is an important part of every diet but how can one go about limiting the side effects? Soy-based foods are a healthy option but patients still must consult a registered dietitian, preferably one who specializes in kidney nutrition. These specialists will help guide the patient to a proper balance of overall protein consumption while also explaining the benefits of differing types of soy protein.

Benefits

• The quality of protein in any food is based upon the level of amino acids it contains. Most soy-foods possess amino acids comparable in benefit to that found in animal products. But the true positives of soy are showcased in the overall advantages it offers specific to those with kidney problems. Soy contributes to a significant drop in cholesterol and other lipids in the blood. Additionally, the American Heart Association recommends soy protein in the fight against heart disease: the number one cause of death among those with kidney disease. Soy also contains a natural compound called isoflavones, found primarily in beans, that is believed to support kidney health.

Concerns

• According to the University of Maryland Medical Center, potassium and phosphorous levels in soy exceed that of protein produced by animals. When kidneys begin to malfunction, their ability to remove normal levels of potassium and phosphorous is already impaired. Those seeking to improve kidney function must limit intake of foods with high traces of these minerals. This is an important reason to consult a renal dietitian before adding soy to the diet.

Example

• The American Heart Association recommends consuming at least 25 g of soy protein daily. This can easily be achieved with one soy burger (10 to 12 g of protein), an 8-oz. glass of soy milk (10 g of protein) and 4 oz. of tofu (13 g of protein).

Good & Bad

• Tofu, soy milk and tempeh (a nutty-flavored soy patty with barley) are the three soy products most kidney patients can use with little concern of negative side effects. Unfortunately, highly-processed alternative products such as veggie burgers, veggie chick-patties, veggie sausage and similar items should be limited in a kidney-healthy diet. Most contain excessive levels of sodium, potassium and phosphorus. Consumption of soy nuts, soybeans, edamame and miso should also be strictly moderated.