Kidney Disease Advocates Raise Alarm Over FDA Proposal for Salt Substitutes

On paper, the idea sounds great: swap out some of the sodium in our food, help millions of people lower their blood pressure, and maybe prevent a few heart attacks along the way. That’s the goal behind a U.S. Food and Drug Administration (FDA) proposal that would let food companies use “salt substitutes” in hundreds of standardized foods, from cheese to canned vegetables.

But for people living with kidney disease, this isn’t just a clever tweak to the food supplyit could be a matter of life and death. Many of the most popular salt substitutes rely on potassium chloride instead of sodium chloride. For healthy kidneys, that’s usually fine. For damaged kidneys that struggle to get rid of potassium, it can be dangerous, potentially triggering high potassium levels in the blood (hyperkalemia), abnormal heart rhythms, and even sudden cardiac arrest.

That’s why kidney disease advocates across the country are raising their handsand their voiceswarning that a one-size-fits-all sodium reduction strategy could unintentionally put vulnerable patients in harm’s way.

What Is the FDA’s Salt Substitute Proposal, Exactly?

To understand the debate, it helps to know what the FDA is actually proposing. Many staple foods in the U.S. are governed by “standards of identity” (SOIs)legal recipes that define what can be called things like cheddar cheese, peanut butter, or canned tomatoes. Right now, those SOIs usually say “salt” when salt is part of the standard recipe.

The proposed rule would revise those standards so that, instead of just “salt,” manufacturers could use “salt or salt substitute” in more than 140 standardized foods. “Salt substitute” would be defined broadly as a safe and suitable ingredient (or blend of ingredients) used to replace some or all of the added salt to reduce sodium content.

Two important points:

• The rule would allow but not require companies to use salt substitutes.
• It’s designed as a “horizontal” rule that applies across many foods at once, rather than changing each product’s standard individually.

This proposal fits into a wider FDA effort to lower Americans’ overall sodium intake. The agency has already issued voluntary sodium reduction targets for dozens of food categories, encouraging companies to gradually dial back salt levels in packaged and restaurant foods.

Why Salt Substitutes Are So Attractive for Public Health

The public health logic behind salt substitutes is straightforward: Americans eat much more sodium than recommendedthe average intake hovers around 3,400 milligrams per day, well above the 2,300-milligram upper limit most guidelines suggest. Excess sodium is strongly linked with high blood pressure, a major driver of heart attacks, strokes, and kidney damage.

Potassium-enriched salt substitutes aim to tackle this problem from two angles:

• Less sodium in the food supply means less sodium in people’s diets.
• More potassium (for those who can safely handle it) may independently lower blood pressure and benefit cardiovascular health.

Large clinical trials, including the well-known Salt Substitute and Stroke Study, have shown that replacing regular salt with a mix of sodium chloride and potassium chloride can lower blood pressure and reduce the risk of stroke and major cardiovascular events at the population level.

The World Health Organization has even issued a guideline promoting lower-sodium salt substitutes as a promising tool to reduce global rates of hypertension and cardiovascular disease.

So from a bird’s-eye view, salt substitutes look like a win. But zoom in on the kidney community, and the picture gets far more complicated.

Where Kidney Disease Advocates Say the Plan Falls Short

The biggest concern from kidney disease advocates centers on potassium chloride, the most common ingredient in many commercial salt substitutes. For people with chronic kidney disease (CKD), especially in later stages, the kidneys can’t efficiently clear potassium from the bloodstream. When potassium builds up, hyperkalemia can occura condition that can cause muscle weakness, dangerous heart rhythm changes, and sudden death.

Kidney organizations have flagged several specific worries:

1. Hidden Potassium in Everyday Foods

Many kidney patients already work hard to avoid high-potassium foods and supplements. They may carefully limit bananas, potatoes, and tomatoes, and they often scrutinize food labels for potassium additives. Now imagine that a simple slice of bread, can of soup, or processed cheese product quietly contains potassium-based salt substitutesand it isn’t obvious on the label.

Patient advocates argue that the FDA proposal, as written, doesn’t do enough to require clear, prominent labeling or warnings that would help CKD patients recognize and avoid potassium-enriched products.

2. Millions of People at Risk

Chronic kidney disease is commonan estimated 37 million adults in the United States have some level of CKD, and many more have diabetes, hypertension, or heart failure, conditions that often co-exist with kidney problems. Many of these patients are on medications that can further raise potassium levels, such as ACE inhibitors, ARBs, or potassium-sparing diuretics.

Advocates say that if potassium-based salt substitutes become widespread in standardized foods without strong protections, a large portion of the population could be exposed to higher potassium intake without realizing it.

3. “Unnecessary Deaths” and a National Health Alert

In 2023, a detailed news report highlighted the concerns of kidney advocates and nephrologists who warned that the FDA’s plan could lead to “unnecessary deaths” among kidney patients by increasing the use of potassium chloride in mass-market foods.

In 2024, the American Association of Kidney Patients (AAKP) went a step further and issued a national health alert on high potassium, explicitly linking their warning to FDA efforts to advance potassium-based salt substitutes and, in their view, failure to adequately address the kidney community’s concerns.

The American Kidney Fund (AKF) has also filed formal comments urging the FDA to fully consider the risks to CKD patients and to strengthen labeling and education provisions before finalizing the rule.

Are Salt Substitutes Always a Bad Idea for Kidney Patients?

Here’s where the story gets nuanced. Not all salt substitutes are created equal, and not all people with kidney disease have the same level of risk.

Research reviews note that potassium-enriched salt substitutes can be quite safe for the general population and even for some people with early-stage CKD, as long as kidney function is reasonably preserved and medications are monitored.

But several key risk factors raise the danger of hyperkalemia:

• Moderate to severe CKD (typically stages 3–5)
• End-stage kidney disease or dialysis dependence
• Use of certain blood pressure or heart failure medications that raise potassium
• Underlying heart, liver, or metabolic conditions that alter potassium balance

For these groups, most expertsand kidney advocacy organizationsrecommend being very cautious with potassium-based products, including many salt substitutes. The risk isn’t theoretical; hyperkalemia is a frequent reason for emergency room visits in CKD patients, and it’s strongly associated with sudden cardiac events.

That’s why advocates aren’t opposed to sodium reduction or even to salt substitutes in principlethey simply want a policy that doesn’t quietly shift risk from the general population onto people whose kidneys can’t keep up.

What Safer Sodium Reduction Could Look Like

So what would a kidney-friendly sodium reduction strategy look like? Advocacy groups and many clinicians have suggested several options:

1. Stronger Labeling and Clear Warnings

Kidney organizations are pushing for bold, front-of-pack labeling when potassium-based salt substitutes are used, or at least highly visible disclosures on the ingredient list and nutrition panel. Some also advocate for warning statements advising people with kidney disease to consult their healthcare team before consuming such products.

2. Limits or Exclusions in High-Risk Food Categories

Another approach could limit potassium-enriched substitutes in foods heavily consumed by older adults and populations with high CKD prevalence. Advocates worry about staple itemslike bread, processed meats, or ready-to-eat mealsquietly becoming potassium enriched.

3. Non-Potassium Strategies for Flavor

Sodium can be reduced using plenty of non-potassium tools: herbs, spices, garlic, citrus, vinegar, umami-rich ingredients, and salt-free seasoning blends. These strategies lower sodium without introducing large amounts of potassium.

While these approaches may require more culinary creativity and gradual taste adaptation, they’re often the safest route for people living with kidney disease.

What Kidney Patients and Caregivers Can Do Right Now

The FDA proposal is still being debated and refined, but potassium-based salt substitutes are already widely available in grocery stores. So what can patients and caregivers do today to stay safe?

1. Learn to Spot Potassium Salt on Labels

If you or a loved one has kidney disease, get into the habit of checking ingredient lists for:

• Potassium chloride (often listed as “potassium chloride” or “potassium salt”)
• Other potassium additives such as potassium bicarbonate, potassium citrate, or potassium lactate

Many kidney organizations specifically warn patients with hyperkalemia risk to avoid salt substitutes that list potassium chloride as a primary ingredient.

2. Talk to Your Nephrologist or Kidney Dietitian

Potassium needs vary widely from person to person. That’s why the safest approach is to ask your nephrologist or renal dietitian directly:

• “Is a potassium-based salt substitute safe for me?”
• “What’s my potassium target, and how should I track it?”
• “Are there particular brands or products I should avoid?”

They can tailor advice based on your lab results, medications, and stage of kidney disease.

3. Use Low-Sodium, Low-Potassium Flavor Hacks

Instead of leaning on any saltregular or substitutetry:

• Fresh herbs like basil, parsley, cilantro, and dill
• Spices such as paprika, cumin, or smoked paprika (within your dietitian’s guidance)
• Lemon juice or zest for brightness
• Vinegar-based marinades for tang and depth
• Onion, garlic, and pepper for savory flavor

These options help you cut sodium without stacking up extra potassium.

Why This Debate Matters Beyond Kidney Disease

This isn’t just a niche policy fight. It’s a case study in how well-intended public health strategies can have very different consequences for different groups of people.

For much of the population, salt substitutes may be a helpful toolespecially if food companies adopt them sensibly and if people still focus on overall healthy eating patterns. But for millions living with kidney disease, plus those with heart failure, diabetes, or on certain medications, the same policies can quietly introduce new risks.

Kidney advocates aren’t trying to derail efforts to reduce sodium. Instead, they’re asking for two things:

• Visibility: Make potassium-based salt substitutes clearly identifiable and understandable on the label.
• Protection: Build in safeguards and warnings for high-risk groups, so sodium reduction doesn’t turn into a potassium problem for them.

Ultimately, a well-designed rule could move the U.S. food supply toward less sodium and still shield kidney patients from hidden hyperkalemia risks. But getting there requires that their voices remain at the center of the conversationnot an afterthought on page 47 of a regulatory document.

Real-World Experiences and Lessons from the Kidney Community

Policy debates can feel abstract, but for people living with kidney disease, this issue is deeply personal. While every patient’s situation is unique, common themes emerge from stories shared in support groups, clinic visits, and advocacy events.

One common experience goes like this: a person with stage 3 or 4 CKD has been doing “everything right”keeping up with appointments, watching sodium, taking blood pressure medications as prescribed. They feel pretty good and decide to get “healthier” by swapping their table salt for a “heart-smart” salt substitute they find at the grocery store. The packaging is full of green leaves, hearts, and words like “lite” and “smart.” The ingredient list does say “potassium chloride,” but if you’ve never been told to look for it, it’s easy to miss.

A few weeks later, their routine labs come back with a potassium level that’s much higher than usual. They may feel nothing at allhyperkalemia can be sneaky that wayor they may notice vague symptoms like muscle weakness or feeling “off.” Their care team scrambles to figure out what changed: medications? Diet? Supplements? Eventually someone asks, “Have you started any new salt substitutes or ‘lite’ salts?” The lightbulb goes on.

Many kidney dietitians can share similar stories. They’ll describe patients who are highly motivated and eager to follow health advice but get caught in the crossfire of generalized heart-health messaging that doesn’t reflect kidney-specific risks. One clinician might say, “Cardiology told them to use a potassium salt to lower sodium. Nephrology told them to avoid potassium. The patient did what seemed most obviousfollow the label that said ‘heart healthy.’”

Caregivers, too, feel the strain. A spouse or adult child trying to cook for someone on dialysis already juggles rules about phosphorus, sodium, potassium, and fluid limits. Add in a shift in the food supplywhere more packaged foods silently use potassium-based salt substitutesand label reading becomes a part-time job. When advocates talk about “unnecessary deaths,” they’re not being dramatic; they’re pointing out how easy it is for a well-meaning family to stumble into trouble without clear warnings and education.

On the flip side, there are positive experiences where good communication makes all the difference. Some kidney clinics run classes that walk patients through actual food labels, showing where sodium and potassium hide and how to decode terms like “lite salt” or “low-sodium” seasoning. Patients who attend often say they feel more confident and less scaredthey still enjoy food, but with tools that help them stay safer.

Advocates want that kind of clarity embedded into national policy. They argue that if salt substitutes are going to become more common in standardized foods, then patients shouldn’t need a master’s degree in nutrition label reading just to stay out of the ER. Clear rules on labeling, smart guardrails around where potassium-based substitutes can be used, and robust education campaigns could help ensure that the benefits of sodium reduction don’t come at the expense of people whose kidneys are already under pressure.

In the meantime, kidney patients and their families are doing what they’ve always done: asking questions, pushing for transparency, and insisting that their lived experience be part of the policy discussion. Whether you’re living with CKD, caring for someone who is, or simply trying to understand the headlines, their message is simple but powerful: less sodium is good, but safety for vulnerable patients has to come along for the ride.

Conclusion: Balancing Salt, Safety, and Smart Policy

The FDA’s proposal to broaden the use of salt substitutes in standardized foods reflects a genuine public health goalcurbing excessive sodium intake and its heavy toll on cardiovascular health. For much of the population, potassium-enriched salt substitutes could be part of the solution. But for people with kidney disease and other high-risk conditions, they can also be a hidden hazard.

Kidney disease advocates aren’t saying “no” to innovation; they’re saying “do it carefully.” With stronger labeling, targeted warnings, non-potassium flavor strategies, and patient-centered safeguards, it’s possible to reduce sodium without turning the food supply into a minefield for those with vulnerable kidneys.

As the FDA weighs comments and refines its rule, one thing is clear: public health policy works best when the people most affected by it are not just consulted, but genuinely heard.