Introduction: As our diets evolve, an increasing reliance on ultra-processed foods may be influencing our health in significant ways. A recent study reveals a disturbing connection between these foods and muscle health, particularly in relation to knee osteoarthritis. This examination emphasizes the importance of dietary choices in maintaining overall well-being.
Higher intake of ultra-processed foods was linked to more fat inside thigh muscles, potentially increasing knee osteoarthritis risk.
Recent research has found that a diet rich in ultra-processed foods correlates with an increase in fat accumulation within thigh muscles, a factor that may elevate the risk of knee osteoarthritis. This association persists when accounting for dietary calories and fat, physical activity, and demographic variables.
The findings were published in Radiology, a journal of the Radiological Society of North America (RSNA). Elevated fat deposits in thigh muscles can contribute to a heightened risk of developing knee osteoarthritis.
Ultra-processed foods are often formulated for extended shelf life and convenience, with a strong appeal to taste. They typically combine sugar, fats, salts, and refined carbohydrates that activate the brain’s reward system, which can lead to overeating.
Examples of ultra-processed foods include breakfast cereals, margarine, packaged snacks, hot dogs, soft drinks, energy drinks, candies, desserts, frozen pizzas, ready-to-eat meals, and mass-produced breads and buns made with synthetic ingredients.
“Over the past decades, along with the rise in obesity and knee osteoarthritis cases, the prevalence of natural ingredients in our diets has steadily declined, replaced by ultra-processed foods that are artificially flavored, colored, and chemically altered,” said the study’s lead author, Zehra Akkaya, M.D., a researcher with the Clinical & Translational Musculoskeletal Imaging group at the University of California, San Francisco, Department of Radiology and Biomedical Imaging.
Dr. Akkaya and her team aimed to explore whether a diet high in ultra-processed foods is linked to fat accumulation in thigh muscles.
MRI Study Examines Diet and Thigh Muscle Composition
The study involved 615 participants from the Osteoarthritis Initiative who exhibited no signs of osteoarthritis at the beginning of the research. Sponsored by the National Institutes of Health, this initiative focuses on enhancing the understanding of knee osteoarthritis prevention and treatment.
“Osteoarthritis is an increasingly prevalent and costly global health issue,” Dr. Akkaya stated. “It contributes significantly to non-cancer-related health care expenses both in the United States and worldwide. It is strongly associated with obesity and poor lifestyle choices.”
The participants included 275 men and 340 women with an average age of 60. On average, the individuals were overweight, with a body mass index (BMI) of 27. Approximately 41% of the foods consumed in the past year were classified as ultra-processed.
Researchers found that higher consumption of ultra-processed foods corresponded with an increase in intramuscular fat in the thigh, independent of total calorie intake. MRI scans revealed fatty degeneration within the muscles, where fat gradually replaces muscle fibers.
MRI Findings Reveal Fatty Degeneration in Thigh Muscles
“This study not only investigates the impact of our modern diet on thigh muscle composition but also employs widely accessible, non-contrast MRI. This makes our approach practical for routine clinical use and future investigations,” Dr. Akkaya explained. “These MRIs do not require sophisticated or expensive technology, making it feasible to integrate them into standard diagnostic processes.”
The researchers believe these findings shed new light on how dietary quality may affect muscle health and its potential association with knee osteoarthritis risk.
“This study underscores the critical role of nutrition in maintaining muscle quality relative to knee osteoarthritis,” Dr. Akkaya remarked. “While addressing obesity is pivotal for knee osteoarthritis treatment, this research highlights the importance of dietary quality. Weight loss plans should thus extend beyond mere caloric restriction and exercise.”
Targeting lifestyle modifications, particularly promoting a healthy, balanced diet and regular physical activity, remains essential for managing early-stage knee osteoarthritis.
Reducing Ultra-Processed Foods May Help Protect Muscle Health
The researchers suggest that reducing ultra-processed food intake could help maintain muscle quality, potentially alleviating some of the challenges associated with knee osteoarthritis.
“Many studies in recent years have demonstrated the negative effects of ultra-processed foods on various health outcomes; however, research on their impact on body composition regarding knee osteoarthritis is sparse,” Dr. Akkaya noted. “This study is the first to assess the effect of ultra-processed foods on thigh muscle composition utilizing MRI technology. Through this exploration, we gain valuable insights into the dietary influences on muscle health.”
Reference: “Ultra-processed Foods and Muscle Fat Infiltration at Thigh MRI: Data from the Osteoarthritis Initiative” by Zehra Akkaya, Gabby B. Joseph, Katharina Ziegeler, Wynton M. Sims, John A. Lynch, Virginie Kreutzinger, Charles E. McCulloch, Nancy E. Lane, Michael C. Nevitt and Thomas M. Link, 14 April 2026, Radiology.
DOI: 10.1148/radiol.251129
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Conclusion: The compelling findings of this research shine a crucial light on the relationship between diet and muscle health. By prioritizing balanced nutrition and minimizing the intake of ultra-processed foods, individuals at risk of knee osteoarthritis may take proactive steps toward better muscle integrity and overall health.
