Effects of Minimally vs. Ultra-Processed Diets on Potassium (K) Handling in CKD

Starting soon · Not applicable

Conditions studied: Chronic Kidney Disease

In brief

What is this study about? This clinical trial is designed to learn how potassium from different types of food affects blood potassium levels and overall health in people with chronic kidney disease (CKD, stages 3B-5). People with CKD are often advised to avoid potassium-rich foods, even though fresh fruits and vegetables are important for good health. However, potassium in processed foods (such as packaged snacks and ready-made meals) may be absorbed differently than potassium from fresh foods. This study will compare minimally processed vs. ultra-processed foods to determine how different sources of potassium affect potassium levels and help create better dietary recommendations for people with CKD. What are the study goals? The study will answer: * Does potassium from fresh foods (like fruits and vegetables) affect blood potassium differently than potassium from processed foods? * How does dietary potassium impact potassium absorption and excretion in people with CKD? Researchers will compare the effects of four diets to understand how low and normal-potassium rich diets from fresh vs. processed foods influence: * Blood potassium levels * Body composition (muscle, fat, and fluid balance) * Vascular health What will participants do? Participants will follow four different 10-day diets over the course of the study. All food will be provided at no cost. These diets are: * Minimally processed with low-potassium content * Minimally processed with normal potassium content * Ultra-processed with with low-potassium content * Ultra-processed with normal potassium content There will be 16-day breaks (washout period) between diets where participants return to their normal eating habits. During the study, participants will: * Pick up prepared meals from the research center approximately 3 times per week. * Attend checkups for weight, blood pressure, and blood tests. * Provide urine samples to track potassium levels. * Wear a comfortable, cuff-free blood pressure monitor at home. * Keep a study journal to track diet, medications, and symptoms. * Complete questionnaires about diet satisfaction and health changes.

Key facts

Study ID

NCT06920914

Run by

University of Alberta

People needed

48

Starts

2026-07-01

Expected to finish

2028-06-01

Last updated by the study team

2026-02-05

Who can join

Age: 18 and older. Sex: any. Healthy volunteers: not accepted.

You may qualify if…

• Participants aged ≥18 years living with stage 3B-5 CKD (estimated glomerular filtration rate ≥ 15 mL/min/1.73m2) on conservative kidney management (not on dialysis).
• Able and willing to follow a controlled feeding regimen, attend in-person visits, provide informed consent, and comply with study procedures.

You may not qualify if…

• General
• Pregnant or lactating women.
• Transitioning transgender individuals.
• Individuals with strict dietary preferences (e.g., vegetarians, vegans) or allergies/intolerance that would preclude participation in the diet phases.
• Kidney Function
• Foreseen start of renal replacement therapy within the next 6 months.
• Acute kidney injury in the past 3 months.
• 2-year Kidney Failure Risk Equation > 40%.
• Preemptive kidney transplant planned within the next 6 months.
• History of kidney transplant.
• Active glomerulonephritis. Comorbidities
• Acute myocardial infarction or stroke within the past 6 months.
• Active cancer.
• Ileostomy, short bowel syndrome or inflammatory bowel disease.
• Body mass index < 18.5 or ≥ 35.
• New York Heart Association Class III or IV congestive heart failure.
• History of ventricular arrhythmia.
• Major surgery within the past 3 months.
• Active autoimmune disease.
• Glycated hemoglobin > 10% within the past 3 months.
• Gastroparesis.
• Chronic nausea and vomiting.
• Intensive care unit admission within the past 3 months.
• Significant psychiatric disease.
• Uncontrolled blood pressure (above 160/100). Current Use of Medications/Supplements

Full record on ClinicalTrials.gov

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