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Welcome to your Daily Wellness Brief. Today, we’re exploring a fascinating intersection of gut health, nutrition, and healthy aging: the science of preserving muscle function.

As we grow older, a natural decline in muscle mass, strength, and function occurs—a condition known as sarcopenia [1]. This process can impact everything from our balance and mobility to our metabolic health. Researchers are continually seeking to understand the cellular mechanisms behind this change and identify strategies to support graceful aging.

Now, a compelling area of study centers on a unique compound our bodies can create called urolithin A (UA). It isn’t found directly in food, but is instead produced by our gut microbiome after we consume certain plant compounds.

What the Research Shows

Urolithin A is a ‘postbiotic’—a beneficial compound produced when gut bacteria digest specific precursors [2]. In this case, bacteria transform ellagitannins, a type of polyphenol found in foods like pomegranates, raspberries, and walnuts, into UA [3]. However, this conversion isn’t universal; it depends on an individual having the right composition of gut microbes, and studies suggest a significant portion of the population may not produce UA efficiently [3].

At the cellular level, UA appears to play a key role in a vital cleanup process called ‘mitophagy’ [2]. Mitochondria are the tiny power plants inside our cells, generating the energy needed for everything, especially muscle contraction. With age, these mitochondria can become damaged and inefficient. Mitophagy is the body’s way of identifying and recycling these worn-out power plants to make way for new, healthy ones [2].

A 2022 randomized clinical trial published in JAMA Network Open investigated the effects of UA supplementation in adults aged 65 to 90. In this trial, participants receiving a daily UA supplement for four months showed significant improvements in muscle endurance—measured by the number of contractions before fatigue—compared to those who received a placebo [4]. The researchers also noted improvements in markers of mitochondrial health [4]. It is important to note that, in this particular study, there were no significant improvements observed in muscle strength or aerobic capacity [4].

These findings suggest that by supporting the quality control of our cellular powerhouses, UA may help muscles resist fatigue more effectively. This research is still evolving, but it points to a promising pathway for supporting muscle tissue during the aging process, complementing established strategies.

What This Means for Everyday Wellness

The most proven and powerful strategies for combating age-related muscle loss remain consistent physical activity and sufficient protein intake [1, 5]. Resistance training, such as lifting weights or using resistance bands, is particularly effective at stimulating muscle growth and maintaining strength [5]. The National Institute on Aging recommends all older adults engage in regular physical activity, including muscle-strengthening exercises [5].

Pairing this activity with adequate protein is crucial for providing the building blocks your muscles need to repair and grow. General guidelines suggest a higher protein intake for older adults to help preserve muscle mass, though individual needs can vary [6].

While the research on urolithin A is intriguing, it’s not a replacement for these foundational habits. Including ellagitannin-rich foods like berries, pomegranates, and walnuts in your diet is a good strategy for overall health, providing fiber, vitamins, and antioxidants. While doing so does not guarantee your body will produce urolithin A, these foods are an excellent addition to a balanced eating plan [3].

Supplemental UA is available, but as this is an emerging science, it’s wise to approach it with thoughtful consideration and to consult with your healthcare provider before adding any new supplement to your routine, especially if you have existing health conditions or take other medications.

A Gentle Reminder

Healthy aging is a multifaceted journey. Embrace the proven benefits of mindful movement and a nutrient-rich diet as your foundation, while staying curiously informed about the scientific discoveries that continue to deepen our understanding of the human body.

Sources and Resources

1. [1] National Institute on Aging. Sarcopenia (2022-05-18). https://www.nia.nih.gov/health/sarcopenia
2. [2] Cell Reports Medicine. The mitophagy activator urolithin A in health and disease (2024-01-16). https://www.cell.com/cell-reports-medicine/fulltext/S2666-3791(23)00508-3
3. [3] Harvard Health Publishing. Can pomegranates and walnuts help you live longer? (2023-09-08). https://www.health.harvard.edu/blog/can-pomegranates-and-walnuts-help-you-live-longer-202309082970
4. [4] JAMA Network Open. Effect of Urolithin A Supplementation on Muscle Endurance and Mitochondrial Health in Older Adults: A Randomized Clinical Trial (2022-01-21). https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2788244
5. [5] National Institute on Aging. How Older Adults Can Get Started with Exercise (2024-04-02). https://www.nia.nih.gov/health/exercise-and-physical-activity/how-older-adults-can-get-started-exercise
6. [6] Cleveland Clinic. How Much Protein Do You Need? (2023-07-13). https://health.clevelandclinic.org/how-much-protein-do-you-need

Educational disclaimer: This article is for general wellness education only. It is not medical advice and does not diagnose, treat, cure, or prevent any condition. It is not a substitute for consultation with a qualified healthcare professional. Always speak with your clinician before starting or changing any medication, supplement, or wellness routine, especially if you are pregnant, nursing, taking medication, or managing a health condition.

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