Gut bacteria and muscle strength: A key to healthy aging
Growing older naturally coincides with a gradual loss of muscle mass and, consequently, strength. Researchers at the Leiden University Medical Center (LUMC) and the Universities of Granada and Almería discovered a gut bacterium that may aid in slowing, or even preventing, this process. The research, published in the scientific journal Gut, reveals a fascinating correlation between the presence of Roseburia inulinivorans and stronger muscles. This discovery could prove very valuable in developing a probiotic to support strength and healthy aging.
The challenge of age-related muscle decline
Postdoc Martínez-Téllez explains: “As we grow older, our muscles naturally lose strength and size. That loss can make everyday tasks harder and increase the risk of falls, frailty, and loss of independence.” Naturally, proper diet and exercise remain essential for maintaining healthy, strong muscles. That said, researchers are exploring different methods of prevention through the intestinal tract. Gut bacteria aid in processing nutrients, regulating inflammation, and energy metabolism; all vital processes for keeping muscles healthy with age. Researchers discovered that individuals aged 65 and older who harboured higher levels of Roseburia inulinivorans exhibited 29% greater handgrip strength than those without it. Similarly, young adults with elevated levels of this bacterium displayed improved muscle performance and overall fitness, highlighting its potential significance across various age groups.
Experimental validation in mice
To further validate these findings and investigate whether the correlation also implies causation, the team conducted experiments in mice by introducing human strains of Roseburia inulinivorans into their gut microbiome. Results were intriguing, with the mice showing a 30% increase in muscle strength, as well as larger muscle fibres. Moreover, not only was muscle growth enhanced, the bacterium also triggered metabolic changes that could explain the improved muscle function. Given that levels of Roseburia inulinivorans naturally decline with age, restoring this gut bacterium could offer a novel strategy for preserving muscle health as we age.
The future of healthy aging
The investigation into Roseburia inulinivorans presents an exciting frontier in the quest for healthy aging. With a patent already secured for its potential to improve muscle mass and strength, further research in humans is still necessary to explore the practical implications of this discovery. The prospect of using a probiotic approach to bolster muscle health is an encouraging development in the field of aging research, opening the door to new strategies for maintaining strength and vitality in later years.
