Muscle Is Medicine. Nobody Is Prescribing It.

Why building muscle is one of our greatest defenses against so many ailments

I do not learn about my patients from their charts.

I learn about them from their tissue.

After 10,000+ joint replacements, I can tell within the first few minutes of a case what kind of physical life someone has been living. The quality of the muscle surrounding the joint. The integrity of the supporting structures. The biological age of the architecture I am working inside — which is often dramatically different from the number on the patient’s wristband.

Two patients last year. Similar age. Similar diagnosis. Similar preoperative pain scores. Completely different bodies on the table.

The first was strong. Not a competitive athlete — just someone who had lifted consistently for years, maintained their muscle mass, kept their posture upright and their supporting structures intact. The surgery was clean. Recovery was textbook. They were walking without assistance faster than the protocol predicted.

The second had spent a decade doing what most Americans do for fitness — some walking, occasional cardio, nothing that loaded the skeletal muscle with any real demand. The muscle surrounding the joint was atrophied and soft. The supporting architecture was compromised. The surgery was harder. Recovery was slower. The complications were not dramatic, but they were real, and they were predictable.

Same diagnosis. Same surgeon. Completely different outcomes.

The difference was muscle. And nobody had ever told the second patient that muscle was something they needed to deliberately build and protect.

That failure is not the patient’s fault. It is the system’s.

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The Silent Epidemic Nobody Is Screening For

Sarcopenia — the progressive loss of skeletal muscle mass and function — is one of the most consequential and least discussed health crises in American medicine.

After age 30, the average adult loses between 3 and 8 percent of muscle mass per decade without deliberate intervention. After 60, that rate accelerates. By the time most people arrive at my operating table in their sixties and seventies, they have been losing muscle for three decades and have never once had a physician discuss it with them, screen for it, or prescribe anything to address it.

The downstream consequences are not limited to surgical outcomes. A 2022 meta-analysis published in the Journal of Cachexia, Sarcopenia and Muscle examining data from over 700,000 individuals found that low muscle mass is independently associated with all-cause mortality, cardiovascular mortality, and metabolic disease — with effect sizes comparable to established risk factors like hypertension and dyslipidemia.

Low muscle mass is as dangerous as high blood pressure. We screen aggressively for one. We do almost nothing about the other.

The annual physical does not measure muscle mass. It does not assess grip strength — one of the most validated predictors of long-term mortality in the literature. It does not ask about resistance training. It measures weight, which tells you almost nothing useful about the composition of that weight or the biological function of the body carrying it.

A scale weight is not a health metric. Muscle mass is.

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The Cardio Lie We Have Been Living

I want to challenge something that has been accepted as health gospel for forty years.

The dominant fitness narrative in America — the one that produced a generation of recreational runners, spin class devotees, and elliptical machine regulars — is built almost entirely around cardiovascular exercise. Cardio for heart health. Cardio for weight loss. Cardio as the primary currency of physical fitness.

Cardiovascular exercise has real and documented benefits. I am not dismissing it.

But cardio does not build muscle. And muscle, it turns out, is not optional.

The cultural over-indexing on cardio has produced millions of metabolically fragile people who are aerobically functional but structurally deficient — people whose hearts are reasonably conditioned but whose skeletal muscle is insufficient to protect their joints, regulate their metabolism, or sustain them through a major medical event.

I see them on my table regularly. Thin, aerobically active, and sarcopenic. The combination is more common than most people realize, and it is more dangerous than simple obesity in certain surgical contexts because it carries none of the visible warning signs that trigger clinical concern.

The engineering problem here is straightforward: you cannot maintain a structure without loading it. A joint unsupported by adequate muscle is a joint under accelerated mechanical stress. A skeleton not subjected to regular resistance load loses density. A body that only moves through low-resistance, repetitive motion patterns develops the postural adaptations of exactly the lifestyle it is living.

Sitting is a structural problem as much as a metabolic one. The anterior pelvic tilt, the forward head posture, the shortened hip flexors and inhibited glutes that characterize a desk-bound population — these are not cosmetic issues. They are mechanical loading problems that alter joint stress patterns and accelerate the degenerative cascade I am eventually asked to surgically address.

The body adapts to the demands placed on it. If the demand is eight hours of sitting and thirty minutes of walking, the body optimizes for exactly that. It does not maintain architecture it is not being asked to use.

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What Muscle Actually Does

Here is the piece the cardio-only conversation misses entirely.

Skeletal muscle is not simply a mechanical system for moving the body. It is an endocrine organ — one of the largest in the body — that produces and secretes signaling molecules called myokines in direct response to mechanical load.

Myokines regulate systemic inflammation, glucose metabolism, cognitive function, immune response, and fat oxidation. IL-6 released from contracting muscle during resistance exercise has potent anti-inflammatory effects — the same cytokine that drives pathology when chronically elevated by stress and poor diet becomes protective when acutely released through muscular contraction.

Irisin, a myokine released during resistance training, crosses the blood-brain barrier and has been associated in multiple studies with reduced neurodegeneration and improved cognitive function. BDNF — brain-derived neurotrophic factor — is upregulated by resistance exercise and represents one of the most powerful known stimulants of neuroplasticity.

When you lift, you are not just building muscle. You are running an anti-inflammatory protocol, a metabolic optimization program, and a cognitive enhancement intervention simultaneously.

There is no drug that does all of that. There is no supplement that replicates it. There is only load.

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The Framework: Muscle First

I want to give you something concrete to carry out of this article.

1. Reframe the goal. The objective of exercise is not weight loss or cardiovascular fitness. Those are byproducts. The primary objective is building and maintaining skeletal muscle mass throughout your lifespan. Every other benefit follows from that.

2. Resistance training is non-negotiable. Two to three sessions per week of progressive resistance training — exercises that place genuine mechanical demand on major muscle groups — is the minimum effective dose. Not yoga. Not walking. Not the light resistance band routine. Load. Progressive, deliberate, increasing over time.

3. Protein supports the structure. Muscle protein synthesis requires adequate dietary protein. The RDA of 0.8g per kilogram of body weight was established to prevent deficiency, not to optimize muscle maintenance in aging adults. The sports medicine and longevity literature consistently supports 1.6 to 2.2g per kilogram for anyone over 40 who is training with intent.

4. Posture is structural integrity. If you sit for more than six hours a day, your hip flexors are shortened, your glutes are inhibited, and your spine is loaded in a pattern it was not designed to sustain indefinitely. Address this deliberately — not with stretching alone, but with the resistance training that restores the posterior chain function that sitting systematically dismantles.

5. Start now, not later. The research on resistance training benefits in adults over 60, 70, and even 80 is unambiguous — it is never too late to build meaningful muscle and recover meaningful function. But the earlier you start, the more you are protecting rather than rebuilding.

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The Prescription We Are Not Writing

I am a surgeon. I fix joints that have failed. I am good at it, and I will keep doing it.

But the most important intervention I can offer most of my patients is not the surgery. It is the conversation I try to have before surgery becomes necessary — the one about what their body needs to stay out of my operating room.

Muscle is medicine. It is the most powerful preventive intervention available for joint disease, metabolic disease, cognitive decline, and all-cause mortality. It is free, it is accessible, and it requires no prescription.

We are not prescribing it. We are not screening for its absence. We are not teaching it in medical school with anything close to the emphasis the evidence demands.

That needs to change. And it starts with surgeons — who see the consequences more clearly than almost anyone — leading that conversation rather than waiting for the system to have it.

Build the muscle. Protect the structure. Do not wait until someone like me is the next appointment on your calendar.

That is the incision point.

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Are you lifting? Or are you still in the cardio trap?

Tell me where you are… and what is stopping you from changing it.

Dr. Michael Meneghini