Build Muscle for a Longer, Healthier Life
Forget the obsession with shedding pounds; the true key to longevity and overall health may lie in building and maintaining muscle mass. Dr. Gabrielle Lyon, a physician with advanced training in nutritional sciences, geriatrics, and metabolism, is pioneering a shift in medical thinking, positioning skeletal muscle as the central organ for aging, disease prevention, and human performance.
Muscle: The Neglected Organ of Longevity
For decades, medical discourse has largely overlooked skeletal muscle. While the focus in recent years has shifted from general obesity to body fat percentage, and now to more nuanced measures like bioimpedance, Dr. Lyon argues that the most critical marker is not just the amount of muscle, but its quality. This includes the intramuscular adipose tissue – essentially, the amount of fat infiltrated within the muscle itself.
“Maybe it’s not that we’re over fat, but that we’re under muscled,” Dr. Lyon proposes, challenging the conventional wisdom that prioritizes fat loss above all else. She points out that losing weight without focusing on muscle can lead to a state of being “skinny fat” – appearing thin on the outside but harboring internal metabolic issues due to muscle loss.
Why Muscle Matters: Beyond Movement
Skeletal muscle constitutes approximately 40% of our body weight, making it the largest organ system. Unlike other organs, we have direct voluntary control over skeletal muscle, allowing us to influence its health and function through exercise. This control is paramount, as muscle plays a far greater role than just enabling movement.
Dr. Lyon highlights that dysfunctional muscle is a root cause of many chronic diseases, including type 2 diabetes, insulin resistance, cardiovascular disease, and even Alzheimer’s disease (often referred to as type 3 diabetes). “Many of these diseases are caused by metabolic pathology,” she explains. “And to say that simply, disregulated glucose, right? Abnormal blood glucose, triglycerides, elevated levels of insulin.”
Functional vs. Dysfunctional Muscle
Functional muscle is characterized by strength, power, mobility, and balance. Dysfunctional muscle, conversely, is weak and can become infiltrated with fat over time, resembling a marbled steak. This fat infiltration reduces the muscle’s metabolic efficiency, particularly its ability to utilize glucose effectively.
“When we think about what’s important for you is how do we get injury prevention?” Dr. Lyon asks. “You know, you and I see patients and we think, okay, well, as we go through life, is there this inevitable decline? And I would say no.” She posits that the perceived decline associated with aging is often a result of “catabolic crisis” moments – periods of inactivity that rapidly decrease muscle mass and strength, rather than an inevitable biological process.
Muscle’s Metabolic Role: A Sugar Regulator
A key function of healthy muscle is its role as a metabolic sink for sugar. At rest, metabolically healthy muscle primarily burns fatty acids for fuel. When we engage in physical activity, especially resistance training, our muscles become more efficient at taking up and utilizing glucose from the bloodstream. This process is crucial for maintaining stable blood sugar levels and preventing insulin resistance.
Dr. Lyon uses the analogy of a suitcase: muscle is a storage unit for glucose. If the suitcase (muscle) is not regularly emptied through activity, it becomes full. When we consume excess carbohydrates without exercising, the glucose has nowhere to go and can lead to elevated blood sugar, increased triglycerides, and higher insulin levels – hallmarks of metabolic dysfunction.
“There’s no such thing as a healthy sedentary person,” Dr. Lyon asserts. “So when we are talking about the metabolic role of skeletal muscle, we have to talk about it from an ideal standpoint which is healthy muscle burns fatty acids at rest. But if we are living in reality, we know that most people are eating way too many refined carbohydrates and grains.”
Myokines: The Signaling Power of Muscle
Beyond its metabolic functions, skeletal muscle releases signaling molecules called myokines when it contracts. Discovered in the early 2000s, these myokines have a profound impact on various bodily systems.
- Brain Health: Myokines stimulate the production of Brain-Derived Neurotrophic Factor (BDNF), which is crucial for cognitive function, learning, and memory.
- Inflammation Regulation: While some cytokines are associated with inflammation, myokines like Interleukin-6 (IL-6), when released from muscle, help to balance the inflammatory response, acting as an anti-inflammatory agent.
- Bone Health: Muscle contractions stimulate bone growth and density.
“There’s this pleotrophic effect there’s this positive effect when these myokines are released from muscle,” Dr. Lyon notes. “They do things we don’t even know about. And so that’s this idea of exercise as medicine.”
The Importance of Protein and Resistance Training
Dr. Lyon emphasizes that protein intake is critical, especially as we age. “The older you are, the more protein you need. Period.” She also notes that increased protein intake is beneficial for those who are more sedentary.
Resistance training is non-negotiable for building and maintaining muscle. Dr. Lyon advocates for a consistent strength training regimen, ideally three days a week, focusing on progressive stimulus. This means gradually increasing the challenge to the muscles over time, whether through more repetitions, increased weight, or improved tempo, ensuring form remains impeccable.
“Progressive overload is increasing the amount of weight necessary to get a particular outcome for strength or hypertrophy,” she explains. “But the reality is it’s about progressive stimulus. And the reason I say progressive stimulus is because again, you are traveling. And there are many people that are listening to this podcast that say are in perimenopause or menopause and the last thing that we want them to do is to injure their shoulder.”
A New Era in Health Assessment
Traditional health metrics like Body Mass Index (BMI) and even body fat percentage can be misleading. Dr. Lyon points out that BMI can flag muscular individuals as unhealthy, and body fat percentage doesn’t reveal the quality of the muscle tissue.
The future of health assessment, according to Dr. Lyon, lies in advanced imaging techniques like MRI, which can accurately assess intramuscular adipose tissue and muscle quality. Companies are emerging that offer these sophisticated body composition analyses, providing a more precise understanding of an individual’s metabolic health and muscle status.
Key Health Takeaways
- Prioritize Muscle: Focus on building and maintaining skeletal muscle mass and quality, as it is crucial for longevity and overall health.
- Protein is Key: Ensure adequate protein intake, especially as you age, to support muscle synthesis and repair.
- Embrace Resistance Training: Engage in regular strength training (ideally 3 days a week) to improve muscle function, metabolic health, and hormonal balance.
- Understand Muscle Quality: Beyond just muscle mass, the quality of muscle tissue, specifically the amount of fat infiltration within the muscle, is a critical health marker.
- Muscle Regulates Metabolism: Healthy muscle helps regulate blood sugar, insulin sensitivity, and burns fat for fuel, playing a central role in preventing metabolic diseases.
- Exercise is Medicine: Muscle contraction releases myokines that benefit brain health, reduce inflammation, and support bone density.
- Beyond BMI: Recognize the limitations of traditional metrics like BMI and consider more advanced assessments of body composition for a clearer health picture.
This article is for informational purposes only and does not constitute medical advice. Always consult with a qualified healthcare professional before making any decisions about your health or treatment. The information presented here is based on the insights of Dr. Gabrielle Lyon, a board-certified physician specializing in nutritional sciences, geriatrics, and metabolism.
Source: Muscle Is the Key to Longevity (Not Fat Loss) | Dr Gabrielle Lyon (YouTube)
