According to Gram Research analysis, nearly 28% of packaged foods sold in supermarkets contain hidden potassium additives, ingredients added during manufacturing that can be dangerous for people with kidney disease. Non-alcoholic beverages are the worst offenders, with 71% containing these additives, followed by sauces at 57% and seafood products at 44.5%. The most common additive is potassium sorbate (E202), a preservative found in 60.6% of products with potassium additives. For people managing chronic kidney disease, these hidden sources of potassium can make it difficult to follow dietary restrictions without carefully reading ingredient labels.
A new study found that nearly 28% of ultra-processed foods sold in supermarkets contain hidden potassium additives, ingredients that help preserve or sweeten food but can be dangerous for people with kidney disease. Researchers analyzed nearly 6,000 packaged products and discovered that drinks, sauces, and seafood products are the biggest culprits. For people who need to watch their potassium intake due to chronic kidney disease, these hidden additives could be a serious health concern that’s hard to spot on labels. The study highlights why reading ingredient lists carefully is so important for managing kidney health.
Key Statistics
A 2026 cross-sectional analysis of 5,884 ultra-processed foods from Danish supermarkets found that 27.8% contained at least one potassium-based additive, representing a widespread hidden source of potassium in packaged foods.
Non-alcoholic beverages showed the highest prevalence of potassium additives at 70.9%, followed by sauces at 57.0% and fish/seafood products at 44.5%, according to the 2026 food label analysis of nearly 6,000 products.
Potassium sorbate (E202) was the most common potassium additive, appearing in 60.6% of all products containing potassium additives, followed by acesulfame K (E950) at 19.7%, in the 2026 supermarket label analysis.
The 2026 study identified that potassium additive information was unknown for 6.5% of products examined, suggesting the actual prevalence of these hidden ingredients may be even higher than the reported 27.8%.
The Quick Take
- What they studied: How many packaged foods contain potassium additives (special ingredients added during manufacturing) and which types of foods have the most of them
- Who participated: Researchers examined 5,884 ultra-processed foods from three major supermarket chains in Denmark between September 2024 and December 2025. Ultra-processed foods are products with many added ingredients like preservatives, colorings, and flavorings.
- Key finding: Nearly 28% of packaged foods contained at least one potassium additive, with drinks being the worst offenders at 71%. For people with kidney disease who must limit potassium, this represents a hidden dietary risk that’s difficult to identify without carefully reading ingredient labels.
- What it means for you: If you have chronic kidney disease and need to limit potassium, you should carefully check ingredient lists on packaged foods, especially drinks, sauces, and seafood products. Look for additives like potassium sorbate (E202), acesulfame K (E950), and potassium carbonates (E501). Talk to your doctor or dietitian before making major changes to your diet.
The Research Details
Researchers conducted what’s called a ‘cross-sectional label analysis,’ which means they looked at food labels from a single point in time rather than following people over months or years. They examined the online product listings from three major supermarket chains in Denmark and checked each product’s ingredient list for potassium-based additives.
They organized the 5,884 products into 12 different food categories (like beverages, sauces, seafood, and ready-to-eat meals) to see which types of foods most commonly contained potassium additives. This approach allowed them to get a snapshot of how widespread these hidden ingredients are in the food supply.
The researchers used the NOVA classification system to identify which products counted as ‘ultra-processed foods’, products that contain many added ingredients beyond basic foods. This classification system is widely used in nutrition research to distinguish between whole foods, minimally processed foods, and heavily processed products.
This research approach is important because it reveals a real-world problem that people with kidney disease face every day: hidden ingredients in foods they think are safe. By analyzing actual product labels from real supermarkets, the study shows what people actually encounter when shopping, rather than just testing foods in a laboratory. This makes the findings directly relevant to everyday life.
This study has several strengths: it examined a large number of products (5,884), used real supermarket data, and was conducted across multiple store locations for better representation. However, the study only looked at products from Denmark, so results may differ in other countries where food regulations and additives vary. The researchers also noted that for 6.5% of products, potassium additive information was not available on labels, which means the actual prevalence could be higher. Because this is a cross-sectional study (a snapshot in time), it shows what’s available now but doesn’t prove that eating these foods causes health problems: that would require different types of research.
What the Results Show
The research revealed that potassium additives are surprisingly common in packaged foods. Out of 5,884 ultra-processed products examined, 27.8% contained at least one potassium-based additive. This means that roughly 1 in every 4 packaged foods on supermarket shelves contains added potassium, often without obvious warning on the front of the package.
The distribution wasn’t even across all food types. Non-alcoholic beverages (drinks like sodas, juices, and flavored waters) were the most problematic, with 70.9% containing potassium additives. Sauces came in second at 57%, followed by fish and seafood products at 44.5%. Even seemingly healthy categories like fruits and vegetables (when processed) contained potassium additives in 30.1% of products.
The most common potassium additive was potassium sorbate (labeled as E202), found in 60.6% of all products containing potassium additives. This ingredient is used as a preservative to prevent mold and bacterial growth. The second most common was acesulfame K (E950), a sweetener found in 19.7% of products, and potassium carbonates (E501), a buffering agent found in 8.8% of products.
The study identified that potassium additives serve different purposes in foods. Some, like potassium sorbate, are preservatives that extend shelf life. Others, like acesulfame K, are sweeteners used in diet sodas and sugar-free products. Still others, like potassium carbonates, are used to control acidity or improve texture. This variety means that potassium can hide in many different types of products under different names, making it harder for consumers to spot.
The research also noted that for 6.5% of products, the potassium additive content was unknown or not clearly labeled. This suggests that the actual prevalence of potassium additives may be even higher than the 27.8% reported, since some products may contain these ingredients but don’t clearly list them on their labels.
Previous research has emphasized that people with chronic kidney disease should avoid ultra-processed foods and choose low-potassium options. However, most dietary guidance hasn’t specifically addressed potassium additives as a hidden source of this mineral. This study fills an important gap by showing that the problem is much more widespread than previously recognized. It suggests that current dietary advice for kidney disease patients may be incomplete if it doesn’t specifically mention checking for potassium additives in ingredient lists.
This study only examined products from supermarkets in Denmark, so the findings may not apply to other countries where food regulations, additives, and product formulations differ. The research was conducted between September 2024 and December 2025, so newer products or reformulated foods aren’t included. Additionally, the study looked at what’s available in stores but didn’t measure how much potassium people actually consume from these additives, just that the additives are present. Finally, for about 6.5% of products, complete information about potassium additives wasn’t available, which means the true prevalence could be higher than reported.
The Bottom Line
For people with chronic kidney disease or those at risk of high blood potassium (hyperkalaemia): (1) Read ingredient lists carefully on all packaged foods, especially drinks, sauces, and seafood products. (2) Look specifically for potassium sorbate (E202), acesulfame K (E950), and potassium carbonates (E501). (3) Work with your doctor or kidney dietitian to create a personalized food plan, as potassium needs vary by individual. (4) When possible, choose fresh, unprocessed foods over ultra-processed alternatives. These recommendations have moderate to strong evidence support based on current kidney disease guidelines, though this specific study documents the problem rather than testing solutions.
This research is most important for people with chronic kidney disease (CKD), especially those with stage 3-5 CKD or those whose doctors have told them to limit potassium. It’s also relevant for people with heart failure, diabetes, or high blood pressure who may need to monitor potassium intake. People without kidney disease or potassium restrictions don’t need to worry about these additives, as potassium is an essential nutrient that most people need more of, not less.
If you have kidney disease and start avoiding these potassium additives, you may see improvements in blood potassium levels within 2-4 weeks, though this varies by individual. The most important thing is consistency, making these changes a permanent part of your eating habits rather than a short-term adjustment. Work with your healthcare provider to monitor your blood potassium levels regularly to see if your dietary changes are working.
Frequently Asked Questions
What are potassium additives and why are they in packaged foods?
Potassium additives are ingredients containing potassium that manufacturers add to foods for specific purposes: potassium sorbate preserves foods and prevents spoilage, acesulfame K sweetens diet products, and potassium carbonates control acidity. They’re common in drinks, sauces, and seafood products.
Do I need to avoid potassium additives if I don’t have kidney disease?
No. Potassium is an essential nutrient most people need more of for heart and muscle health. Only people with chronic kidney disease, heart failure, or specific medical conditions need to limit potassium intake. Check with your doctor about your individual needs.
How can I identify potassium additives when shopping?
Look for these ingredient codes on food labels: E202 (potassium sorbate), E950 (acesulfame K), and E501 (potassium carbonates). Check ingredient lists on drinks, sauces, and seafood products most carefully, as these categories had the highest prevalence of potassium additives in the study.
What should people with kidney disease eat instead of packaged foods with potassium additives?
Choose fresh, unprocessed foods like fresh vegetables, fruits, grains, and proteins without added ingredients. Work with a kidney dietitian to create a personalized meal plan, as potassium needs vary by individual and stage of kidney disease. Your doctor can provide specific guidance.
Can potassium additives in foods cause health problems for people with kidney disease?
Yes, excess potassium can be dangerous for people with kidney disease, potentially causing heart rhythm problems and muscle weakness. This 2026 study shows these additives are widespread in packaged foods, making it harder for people with kidney disease to manage their potassium intake without careful label reading.
Want to Apply This Research?
- Track the number of packaged foods you consume daily and note which ones contain potassium additives (E202, E950, E501). Create a weekly log showing: (1) total packaged foods eaten, (2) how many contained potassium additives, and (3) your goal to reduce this number by 10-20% each week.
- When shopping, use the app to scan product barcodes or search the ingredient list database before adding items to your cart. Set up alerts for your favorite products if they contain potassium additives, and use the app’s ‘find alternatives’ feature to discover similar products with fewer potassium additives. Create a personal ‘safe foods’ list of verified low-potassium products you can reference while shopping.
- Track your blood potassium levels (if your doctor orders regular tests) alongside your dietary changes in the app. Create a monthly report showing your potassium additive exposure trends and correlate this with any changes in your lab results. Share this data with your healthcare provider to see if your dietary modifications are effectively managing your potassium intake.
This research identifies potassium additives in packaged foods but does not provide medical advice. If you have chronic kidney disease, heart failure, diabetes, or high blood pressure, consult your doctor or registered dietitian before making significant dietary changes. Blood potassium levels should be monitored by healthcare professionals through regular lab tests. Individual potassium needs vary based on kidney function, medications, and other health conditions. Do not self-diagnose or self-treat based on this information alone.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.
