Research shows that potassium-based salt substitutes, while beneficial for the general population, pose a serious risk for people with kidney disease because damaged kidneys cannot remove excess potassium from the blood. According to Gram Research analysis of clinical guidance from the American Society of Nephrology, people with kidney disease, especially those on dialysis, should avoid potassium-based salt substitutes and instead work with their healthcare team to manage potassium intake through careful food selection and dietary planning.
The FDA recently encouraged food companies to use potassium-based salt substitutes instead of regular salt to help prevent high blood pressure in the general population. However, according to Gram Research analysis, this well-intentioned change poses a serious risk for people with kidney disease, especially those on dialysis. When kidneys don’t work properly, they can’t remove excess potassium from the body, which can lead to a dangerous condition called hyperkalemia. A major nephrology organization has now released detailed guidance to help people with kidney disease safely manage potassium additives in their diet while still maintaining good nutrition.
Key Statistics
The FDA’s 2023 recommendation to replace salt with potassium-based salt substitutes was intended to reduce hypertension in the general population, but excess intake of these substitutes may increase the risk of hyperkalemia in people with kidney failure on dialysis, according to a 2026 review in Seminars in Nephrology.
The American Society of Nephrology produced kidney health guidance that includes three levels of dietary strategies, basic, advanced, and intensive, specifically designed to mitigate hyperkalemia risk from potassium additives in patients with reduced kidney function.
Potassium-containing food additives such as potassium sorbate, potassium phosphate, and potassium chloride are widely used in food processing, making careful label reading essential for people with kidney disease to avoid dangerous potassium buildup.
The Quick Take
- What they studied: How potassium-based salt substitutes affect people with kidney disease, and what dietary strategies can help them avoid dangerous potassium buildup
- Who participated: This was a review article analyzing existing research and clinical guidance, not a study with human participants. It focused on recommendations for people with reduced kidney function, particularly those on dialysis
- Key finding: Potassium-based salt substitutes, while beneficial for the general population, can be harmful for people with kidney disease and require careful dietary management strategies
- What it means for you: If you have kidney disease or are on dialysis, you should not switch to potassium-based salt substitutes without talking to your doctor or kidney specialist. Your healthcare team can help you choose safe alternatives and manage your potassium intake
The Research Details
This is a review article, which means researchers examined existing scientific literature and clinical guidelines rather than conducting a new experiment. The American Society of Nephrology, a major organization of kidney doctors, had previously created dietary guidance for managing potassium in people with kidney disease. This review took that guidance and refined it specifically for people on dialysis, who face the greatest risk from excess potassium.
The researchers looked at how potassium-containing food additives work, why the FDA recommended potassium-based salt substitutes for the general public, and what specific risks these additives pose for people with kidney problems. They then developed three levels of dietary strategies, basic, advanced, and intensive, to help people with kidney disease reduce their potassium intake while still getting proper nutrition.
This type of review is valuable because it brings together expert knowledge and existing research to create practical recommendations that doctors and patients can actually use in real life.
Understanding how food additives affect people with kidney disease is critical because these additives are in many processed foods, and people often don’t realize they’re consuming them. When the FDA encouraged manufacturers to switch to potassium-based salt substitutes, it created an unintended problem for a vulnerable population. This review helps doctors and patients understand the risks and provides clear strategies to manage them
This review was published in Seminars in Nephrology, a respected medical journal focused on kidney disease. It was informed by guidance from the American Society of Nephrology, which is the leading professional organization for kidney specialists in the United States. The fact that major medical organizations are addressing this issue shows it’s a real and important concern. However, as a review article rather than a new research study, it synthesizes existing knowledge rather than presenting brand-new experimental data
What the Results Show
The review confirms that potassium-based salt substitutes, while helpful for reducing high blood pressure in people with healthy kidneys, create a serious risk for people with kidney disease. When kidneys don’t function properly, they lose the ability to filter out excess potassium, causing it to build up in the blood, a condition called hyperkalemia. This buildup can cause irregular heartbeats and other dangerous heart problems.
The American Society of Nephrology’s guidance includes three levels of dietary strategies. Basic strategies involve reading food labels carefully to identify potassium additives and choosing foods with lower potassium content. Advanced strategies include more detailed meal planning and working with a dietitian to balance nutrition while limiting potassium. Intensive strategies are for people on dialysis who need the most careful potassium management.
The review emphasizes that people with kidney disease should not use potassium-based salt substitutes without explicit approval from their kidney doctor. Instead, they should work with their healthcare team to find safe alternatives that don’t contain potassium additives.
The review also highlights that many people don’t realize how much potassium is hidden in processed foods through additives. Common potassium-containing additives include potassium sorbate (used as a preservative), potassium phosphate (used in baking), and potassium chloride (the main ingredient in potassium-based salt substitutes). People with kidney disease need to become label readers and understand where these additives appear in their diet
This review builds on previous guidance from the American Society of Nephrology by making recommendations more specific and practical for people on dialysis. It acknowledges that the FDA’s recommendation for potassium-based salt substitutes was well-intentioned for the general population but created an unintended consequence for people with kidney disease. The review essentially says: ‘We need to be more careful about how we apply general health recommendations to people with specific medical conditions’
As a review article, this research doesn’t present new experimental data, so it can’t provide new statistics about how many people are affected or how much potassium is too much for different individuals. The recommendations are based on expert consensus and existing research rather than new clinical trials. Additionally, the review doesn’t provide detailed information about how to implement these strategies in different cultural food traditions or for people with limited access to specialized dietitian care
The Bottom Line
If you have kidney disease: (1) Talk to your kidney doctor before using any salt substitutes, especially potassium-based ones. (2) Learn to read food labels and identify potassium additives. (3) Work with a kidney dietitian to create a meal plan that manages potassium safely. (4) Use regular salt in moderation rather than switching to potassium-based alternatives. Confidence level: High: this is based on established medical knowledge about how kidneys work and how potassium affects the heart
This guidance is essential for people with chronic kidney disease, especially those on dialysis. It’s also important for family members and caregivers who prepare meals for people with kidney disease. People with healthy kidneys don’t need to worry about potassium-based salt substitutes, in fact, they may benefit from them for blood pressure control. However, if you have any kidney disease, even mild, you should discuss salt substitutes with your doctor
The benefits of proper potassium management happen gradually. You won’t feel immediate changes, but over weeks and months of maintaining a kidney-safe diet, you’ll reduce your risk of dangerous potassium buildup and heart problems. If you’re on dialysis, your doctor will monitor your blood potassium levels regularly to make sure your dietary changes are working
Frequently Asked Questions
Are potassium salt substitutes safe for people with kidney disease?
No. Potassium-based salt substitutes can be dangerous for people with kidney disease because damaged kidneys cannot remove excess potassium, leading to hyperkalemia, a condition that can cause irregular heartbeats and heart problems. Always consult your kidney doctor before using any salt substitute.
What potassium additives should I avoid if I have kidney disease?
Common potassium additives to avoid include potassium sorbate (preservative), potassium phosphate (baking ingredient), and potassium chloride (salt substitute). Check ingredient lists on processed foods, especially canned goods, baked products, and prepared meals, which frequently contain these additives.
How can I reduce potassium intake while still eating healthy with kidney disease?
Work with a kidney dietitian to create a meal plan that limits potassium while maintaining nutrition. Focus on fresh, unprocessed foods rather than packaged items, read all food labels carefully, and use regular salt sparingly. Your kidney doctor can provide specific potassium targets for your situation.
Why did the FDA recommend potassium salt substitutes if they’re dangerous for kidney patients?
The FDA’s 2023 recommendation was intended to reduce high blood pressure in the general population with healthy kidneys. However, this well-intentioned change created an unintended risk for people with kidney disease, highlighting the importance of personalized medical advice based on individual health conditions.
How often should I have my potassium levels checked if I have kidney disease?
Your kidney doctor will determine the appropriate testing schedule based on your kidney function and whether you’re on dialysis. People on dialysis typically have blood potassium levels monitored regularly, often monthly or more frequently, to ensure dietary management is working effectively.
Want to Apply This Research?
- Track daily potassium intake by logging all foods and beverages consumed, noting which items contain potassium additives (check ingredient lists for potassium sorbate, potassium phosphate, potassium chloride). Compare weekly totals to your target potassium limit set by your kidney doctor
- Replace potassium-based salt substitutes with regular salt used sparingly, or ask your doctor about approved alternatives. When grocery shopping, use the app to scan food labels and identify potassium additives before purchasing. Set reminders to review nutrition labels on processed foods you eat regularly
- Weekly review of potassium intake trends, monthly check-ins with your logged data before kidney doctor appointments, and quarterly adjustments to your dietary strategy based on blood test results showing potassium levels
This article is for educational purposes only and should not replace professional medical advice. If you have kidney disease or are on dialysis, consult your nephrologist (kidney doctor) or registered dietitian before making any dietary changes, including switching to salt substitutes or significantly altering your potassium intake. Blood potassium levels can be dangerous if not properly managed, and individual needs vary based on kidney function, medications, and other health conditions. Always follow your healthcare provider’s specific recommendations for your situation.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
