Ultra-Processed Foods Linked to Higher Knee Osteoarthritis Risk

A new study suggests that ultra-processed foods (UPFs), which are heavily processed with artificial additives and commonly consumed, may increase the risk of developing degenerative osteoarthritis, a condition characterized by the wearing down of bone joints causing pain. UPFs are manufactured for long shelf life, strong flavor, and convenience, with common examples including breakfast cereals, bacon, hot dogs, and packaged snacks.

This study was conducted by a research team led by Dr. Zehra Akkaya at the University of California, San Francisco (UCSF), analyzing existing 'Osteoarthritis Initiative' data from 615 participants who did not have osteoarthritis. Researchers examined degenerative changes in the thigh muscles of these participants using non-contrast MRI scans to identify fat deposits instead of muscle fibers.

The study results showed that participants who consumed higher amounts of UPFs had greater fat accumulation in their thigh muscles. This association was observed regardless of total calorie intake, body weight, or exercise levels. The study participants consumed approximately 41% of their daily food intake from UPFs.

Increased fat in the thigh muscles can weaken the knee support system, leading to joint stress and inflammation. When the diet consists primarily of UPFs, muscle quality and knee health can be compromised. Reducing UPF consumption may help preserve muscle quality and alleviate the burden of knee degenerative osteoarthritis.

This study demonstrated an association between ultra-processed foods and increased fat accumulation in muscles, but it has limitations in clearly proving whether the foods directly caused fat accumulation or if it was merely a co-occurring factor.