Interview with Dr. Gabrielle Lyon, Founder of Muscle-Centric Medicine — The Case for Muscle as Medicine

Dr. Thais Aliabadi and Mary Alice Haney sat down with Dr. Gabrielle Lyon to pull apart a simple but revolutionary idea: muscle is not only for performance or appearance — it is a cornerstone organ for metabolic health, resilience, and long-term independence. What follows is a focused interview-style guide that translates her clinical experience and the evidence she discusses into practical steps you can use now. 

Table of Contents

• Why this matters
• What muscle actually does: three practical buckets
• Resistance training: the essential prescription
• Protein: how much and why it matters
• GLP-1 medications and muscle — balancing benefits and risks
• Practical program: what to do this week
• Testing and tracking progress
• Menopause, anabolic resistance, and hormones
• Protein quality: plant versus animal
• Muscle and the brain: myokines and BDNF
• Muscle span: a new way to think about aging
• Common misconceptions and practical clarifications
• Tools, books, and resources
• How to start if you are overwhelmed
• FAQ
• Action checklist — what to do this month
• Final thought

Why this matters

Muscle controls how we use energy, clear glucose, manage hormones, and even support brain health. When muscle is healthy, many downstream problems — from elevated triglycerides and insulin resistance to fatigue and cognitive decline — become easier to prevent or reverse.

Can you tell us how you came to focus on muscle as the organ of longevity?

We began this work in geriatrics and nutritional science and stumbled onto a striking pattern. A mid-50s woman who had “done everything right” — exercised and dieted — had imaging that looked like early neurodegeneration. The surprising root cause was not simply calories or body weight. It was a loss of skeletal muscle from years of yo-yo dieting and primarily cardiovascular movement. That flash of insight shifted our framing: many metabolic and age-related problems are fundamentally muscle problems.

What muscle actually does: three practical buckets

To make muscle actionable, we think about it in three functional buckets:

• Mass — how much lean tissue you have.
• Strength and quality — how well the tissue performs and whether it is infiltrated by fat.
• Metabolic plumbing — how well muscle clears glucose, burns fat at rest, and supports circulation and brain health.

How is muscle connected to metabolic health and conditions like PCOS?

Muscle is the primary sink for carbohydrates and plays a leading role in insulin-mediated glucose disposal. In PCOS, insulin resistance is a central issue, and the receptors that respond to insulin are on muscle. Improving muscle responsiveness through movement and targeted nutrition improves glucose handling, lowers insulin, and reduces the inflammatory cascade tied to visceral fat and fatty liver.

Resistance training: the essential prescription

We need to redefine what resistance training means for everyday life. It is simply moving the body against force. That force can be bands, body weight, dumbbells, machines — whatever fits a person’s starting point. The key is providing enough mechanical stimulus for the muscle to recognize that it needs to adapt and stay functional.

How often and how intense should resistance training be?

Our simple, evidence-backed prescription is:

• Three full-body resistance sessions per week — practical and sustainable.
• Progressive stimulus — increase the challenge over time, either by adding load, increasing reps, or manipulating rest and tempo.
• Intensity can be higher or lower depending on experience. The stimulus matters more than whether you lift heavy or light.

For experienced lifters, higher loads and lower reps can be efficient. For beginners and older adults, higher volume (more reps) often delivers similar benefits with lower injury risk because tendons typically lag behind muscles in strength gains.

Protein: how much and why it matters

Muscle remodeling depends on amino acids plus the mechanical signal from resistance training. Over time, aging muscle becomes less sensitive to protein — a phenomenon called anabolic resistance. That means we need larger doses of dietary protein to trigger muscle protein synthesis the way younger bodies do.

How much protein should women eat?

In clinical practice, we use a practical baseline: at least 100 grams of protein per day for most adult women. This is a floor — many people will benefit from more, depending on body size, activity level, and goals. Worryingly, national intake patterns show women typically average around 70 grams per day, which is below what is needed to support optimal muscle growth.

What about per-meal protein?

Aim for a meaningful protein dose each meal — roughly 30 grams as a minimum threshold to reliably stimulate muscle protein synthesis in older adults. Younger people may respond to smaller doses, but as we age, the meal threshold becomes more important.

GLP-1 medications and muscle — balancing benefits and risks

GLP-1 receptor agonists have been transformative for metabolic disease, PCOS, and obesity because they lower appetite and inflammation. But we must be aware of an important side effect: when appetite drops rapidly, and protein intake is low, a disproportionate amount of weight loss can come from skeletal muscle. Some datasets suggest up to half of the weight lost could be lean mass in certain scenarios.

If someone starts a GLP-1, what should they do to protect their muscles?

The two nonnegotiables are:

• Prioritize resistance training — at least three days per week of full-body sessions.
• Consume enough protein — no less than 100 grams per day and aim for around 30 grams or more at meals.

We also recommend thoughtful dosing strategies like micro-dosing rather than large initial doses when appropriate, and close dietary monitoring so protein and total energy are adequate while on therapy.

Practical program: what to do this week

If you are starting or restarting strength work, we give people a simple blueprint that delivers measurable results without complexity. Here is a sample week:

• Monday — Full-body resistance session (compound moves: squat or squat variation, hinge/pull, push, core).
• Tuesday — Low- to moderate-intensity cardio (bike, walk) + mobility/foundational five (5-minute daily mobility routine).
• Wednesday — Full-body resistance session (different set/rep scheme or exercise variations).
• Thursday — Active recovery: mobility, light walk.
• Friday — Full-body resistance session.
• Saturday — Conditioning: interval-style cardio or other higher-intensity conditioning.
• Sunday — Rest and recovery.

A full-body session need not be long — 30 to 45 minutes is sufficient. Focused sessions three times weekly will maintain or build muscle mass while improving strength and metabolic health.

Testing and tracking progress

We use accessible lab and imaging markers to follow metabolic and muscle health:

• Labs: fasting insulin, fasting glucose, triglycerides, hemoglobin A1c, lipid panel, blood pressure, and body fat percentage, where possible. Elevated triglycerides are a sensitive signal of disturbed muscle metabolic handling.
• Imaging: DEXA is a useful starting point for body composition because it estimates lean mass and body fat. MRI gives the best look at intermuscular adipose tissue, but it is not practical for routine care. Ultrasound and CT have specific uses but are not routine.

Why triglycerides matter

When muscle is insulin-resistant, ingested carbohydrates stay in the blood and insulin rises. Insulin drives the liver to convert excess glucose into triglycerides. These triglycerides load into visceral fat and the liver, causing inflammation and a cycle that worsens insulin resistance. Improving muscle insulin sensitivity through movement lowers insulin, clears glucose from the blood, and reduces triglycerides.

Menopause, anabolic resistance, and hormones

Menopause brings changes that affect muscle, but the major driver of change is anabolic resistance — muscle becomes less efficient at using dietary protein and less responsive to typical stimuli. That does not mean muscle cannot respond; when women prioritize resistance work and adequate protein, muscle responds robustly even in the absence of estrogen replacement.

Does estrogen directly control muscle protein synthesis?

Hormones play a role, but estrogen is not the primary determinant of muscle protein synthesis. The dominant drivers are the mechanical stimulus and the availability of essential amino acids. In carefully controlled studies, postmenopausal women who follow an appropriate training and nutrition plan can build and maintain lean tissue without hormone therapy.

Protein quality: plant versus animal

The protein conversation has two components: essential amino acids and the micronutrient matrix. Animal proteins are typically highly bioavailable and naturally provide the nine essential amino acids in ratios favorable for muscle remodeling, plus key micronutrients such as B12, iron, zinc, and selenium. Plant proteins can provide all essential amino acids, but often require higher total intake and thoughtful combining to match animal sources. For people relying on plant proteins, attention to total calories and carbs is important because plant-based whole foods can be high in fiber and less concentrated in protein per calorie.

Are supplements useful?

Supplements can complement but never fully replace a foundation of resistance training and whole-food protein. Clinically useful options include:

• Essential amino acid blends or whey protein — convenient ways to reach per-meal thresholds.
• Creatine — supports energy output and performance, which helps training quality; it is safe for many people and useful for aging muscle.
• Omega-3 fatty acids — have some data supporting benefits for females and inflammation modulation.
• Urolithin A — a postbiotic that supports mitochondrial health for some people and is used clinically in select cases.

Routine glutamine supplementation is not necessary for most people; we reserve it for specific gut health indications.

 

Muscle and the brain: myokines and BDNF

Contracting skeletal muscle releases myokines — peptide hormones that travel through the body and signal other tissues, including the brain. These signals help trigger the release of BDNF, brain-derived neurotrophic factor, which supports neurogenesis and brain health. Both cardiovascular and resistance training promote this muscle-brain axis, so training serves cognitive health as well as physical resilience.

How much cardio versus strength for brain benefits?

Both matter. Cardio supports blood flow and some myokine signaling; resistance training produces strong metabolic and anabolic signals and preserves muscle mass. We recommend a mix: two days of varied cardiovascular activity and three days of resistance training each week as a broadly protective pattern for both body and brain.

Muscle span: a new way to think about aging

We coined the term muscle span to describe the duration of life spent with healthy skeletal muscle. This concept complements lifespan and health span. Actions taken early in life — building strength and staying active — lay down reserves that protect people decades later. Similarly, midlife is a critical pivot. Busy schedules, fear of injury, and shifting priorities often lead to reduced stimulus — and that is when accelerated muscle decline happens. The antidote is consistent, targeted training and attention to protein.

How does genetics factor into muscle potential?

Genetics influence baseline tendencies, fiber type distribution, and how quickly someone responds. But epigenetics and environment matter deeply. Encouraging physical activity from a young age and creating a home that values movement can produce children who are naturally more muscular and active. Most people have not reached their genetic muscular potential. There is usually room for meaningful improvement through training and nutrition.

Common misconceptions and practical clarifications

• We will not bulk up unintentionally. For most women, lifting to challenge muscle will produce strength and tone rather than extreme hypertrophy.
• Cardio is not the same as resistance training. Both have roles, but resistance training is the primary tool to preserve mass and metabolic capacity.
• Protein matters more than calorie counting alone when your goal is muscle preservation and metabolic health.
• GLP-1s are powerful tools but require intentional diet and training strategies to avoid disproportionate lean mass loss.

Is lifting heavy better than lighter weights with more reps?

The evidence shows the outcome is similar if the stimulus reaches failure or near failure. Lifting heavier weights can reach the stimulus faster, but lighter weights with more volume also work. The right choice depends on experience, technique, and injury risk. Novices and older adults often benefit from higher volume and slower progression to protect tendons and joint mechanics.

Tools, books, and resources

We like action-oriented resources: a simple training playbook, meal templates that hit protein targets, and short mobility routines that keep people moving multiple times per day. Dr. Lyon’s latest playbook is designed for exactly this: clear programming, recipes that help reach protein goals, recovery strategies, and templates to close the gap between knowing and doing.

What is the single most important thing to remember?

Muscle is the organ of longevity. Prioritize resistance training, target protein across meals, and treat muscle as a vital organ you protect for metabolic health, brain resilience, and independence decades from now.

How to start if you are overwhelmed

Start small and specific. Begin with a plan you can repeat reliably:

1. Commit to three 30- to 45-minute full-body resistance sessions per week.
2. Hit at least 30 grams of protein at two or three meals, aiming for 100 grams total daily as a floor.
3. Add two days of cardiovascular activity — walking, cycling, or intervals — and a short daily mobility routine.
4. Focus on progressive stimulus: small weekly increases in difficulty.
5. Monitor labs periodically: triglycerides, fasting insulin, and glucose as practical signals of metabolic progress.

FAQs

How much protein should I eat while on a GLP-1 medication?

Aim for at least 100 grams of protein per day, and approximately 30 grams per meal, to help prevent lean mass loss while suppressing appetite. Pair this with three weekly resistance training sessions.

Will lifting weights make me bulky?

No. Most people, especially women, will gain strength and lean tone without extreme hypertrophy. To become very large requires specific high-volume training and often different hormonal/meal strategies. For the majority, resistance training leads to a functional, resilient body.

Can older women still build muscle without hormone replacement?

Yes. While hormones influence physiology, the primary drivers of muscle gains are the mechanical stimulus from resistance training and adequate dietary protein. Many postmenopausal women respond well to a well-structured, protein-focused diet.

Which labs should I track to monitor metabolic improvement?

Useful labs include fasting insulin, fasting glucose, triglycerides, hemoglobin A1c, and a standard lipid panel. Improvements in triglycerides and fasting insulin often parallel better muscle metabolic health.

Are plant proteins sufficient for muscle maintenance?

Plant proteins can be sufficient if total intake is higher and meals are planned to ensure all essential amino acids are available. Many people find it easier to meet per-meal protein thresholds with concentrated animal proteins or supplements, but well-designed plant-based plans work.

Action checklist — what to do this month

• Schedule three full-body resistance sessions into your calendar for the next four weeks.
• Track your daily protein intake and aim for at least 100 grams.
• Order a simple protein supplement or essential amino acid blend for post-workout or low-appetite days.
• Request a baseline set of labs: fasting insulin, triglycerides, fasting glucose, A1c, and lipid panel.
• Commit to a five-minute daily mobility routine to preserve joint function and reduce injury risk.

Final thought

We want to shift the conversation from reactive dieting and endless cardio to a practical, resilient approach: treat muscle like an organ worth protecting. Strength is not vanity. It is a medical strategy to preserve function, lower disease risk, and support mental and cognitive health across decades. Small, consistent investments in training and protein compound into a more resilient future self.

This article was created from the video Muscle Over Medicine? Dr. Gabrielle Lyon on the Future of Women’s Metabolic Health | SHE MD for Dr. Thais Aliabadi’s website.