Muscle Is Not Only for Moving Things

Skeletal muscle is the largest organ system in an adult male body by mass. Treating it as a mechanical tissue misses most of what it does.

It is where your meals go

After you eat, glucose enters the blood and insulin rises to move it into cells. In controlled research, skeletal muscle takes up the large majority of that insulin-driven glucose, put at roughly 80 per cent in a widely cited 2009 review. A man with more healthy muscle has a bigger place to put the rice, roti and sugar he eats. A man with less has a smaller one. Glucose stays in the blood longer, the pancreas pushes out more insulin, and over the years the system drifts towards insulin resistance. This is one reason men lose metabolic health with age even when their weight stays flat.

It is your protein reserve

In serious illness, infection, major surgery or prolonged stress, the body needs amino acids to build immune proteins and repair tissue. It gets them mainly by breaking down muscle, which is why muscle is better understood as a metabolic reserve than a cosmetic tissue. A man who goes into surgery at 65 with plenty of muscle has something to spend. A man who goes in with little is borrowing from structural tissue that is already thin. That is part of why people who are stronger beforehand tend to recover better afterwards.

What the Research Shows About Strength and Survival

The strongest headline findings come from large observational studies. They are worth knowing, along with their limits.

The grip strength study

The PURE study followed nearly 140,000 people aged 35 to 70 across 17 countries of high, middle and low income. The grip strength analysis, published in The Lancet in 2015, found that for every 5 kg lower grip strength, the risk of death from any cause was 16 per cent higher. Cardiovascular death was 17 per cent higher, heart attack 7 per cent higher and stroke 9 per cent higher. In one analysis, grip strength predicted death better than systolic blood pressure.

The meta-analysis of lifting

In 2022, a pooled analysis of 16 prospective studies on muscle-strengthening activity, published in the British Journal of Sports Medicine, found that people who did any muscle-strengthening activity had a lower risk of dying from any cause than people who did none (relative risk 0.85). The figures were similar for cardiovascular disease (0.83), cancer (0.88) and diabetes (0.83).

Strength is a strong marker of future health. Training strength improves several of the mechanisms that drive that future, including insulin sensitivity, blood pressure, bone density and physical function, and those effects are backed by randomised trials.

Why Muscle Slips Away Quietly After 40

Peak muscle mass in men usually comes in the late twenties or thirties. After that, loss begins. Secondary sources put it at roughly 3 to 8 per cent per decade after 30, with the pace picking up after 60. Treat that as a range, because it varies by measure, population and activity level.

Strength falls faster than mass, and power falls faster than strength. This is because the fast-twitch fibres, which produce power, are lost first. A man at 60 can often still walk for hours, but cannot rise quickly from a chair or catch himself when he trips. Power is what turns a stumble into a recovery instead of a fracture.

Several things combine: motor neurons die back, repair cells decline, testosterone and growth hormone drift down, and the muscle becomes less responsive to its two main growth triggers, mechanical load and dietary protein. That last point has a name: anabolic resistance. Muscle is in constant turnover, built through muscle protein synthesis and broken down continuously. In a young adult, a moderate serve of protein produces a sharp rise in synthesis. In an older adult, the same serve produces a smaller rise. Research suggests that older men may need a larger relative dose of protein in a single meal than younger men to get the same response. The exact thresholds are still being checked, but the direction is consistent: the same breakfast that worked at 28 stops working at 48.

Here is the encouraging part. In 1990, researchers at Tufts put frail nursing home residents, with an average age in the nineties, on supervised high-intensity resistance training. Their strength rose sharply within weeks. The limit was never the muscle. It was the lack of a stimulus. A man of 50 who starts now is in a far better position than those participants were.

Why Indian Leaders Start From a Worse Position

Most of the research above was done on Western populations. Indian and South Asian men have a different starting point, and this matters.

South Asians tend to carry more body fat and less lean mass than Europeans at the same BMI, with more of that fat sitting around the abdominal organs, a pattern described as the thin-fat phenotype. An Indian leader with a BMI of 24 and a waist of 94 cm may have less muscle and more visceral fat than the number suggests. Standard BMI cut-offs understate his metabolic risk. The sarcopenia thresholds also differ: the Asian Working Group for Sarcopenia uses different cut-offs from the European guidelines, so a Western threshold can miss a real deficit in an Indian man.

Add low vitamin D, long commutes, client dinners with alcohol, and a culture where strength training for a man in his fifties is not the norm. Yoga and walking are valuable, but neither provides a steadily increasing load.

Why the Leadership Calendar Is a Recipe for Muscle Loss

If you wanted to design a lifestyle that strips muscle, you would struggle to improve on the working life of a senior executive.

Each of these is modest alone. Together, over 20 years of a career, they can leave a man having lost a good share of his strength and metabolic buffer at the point when he holds the most responsibility. Executives also train in bursts: a heavy few weeks, then a month of travel with nothing. Two sessions a week held for years beat six a week for six weeks followed by a gap.

What to Do: A Protocol That Survives a Travel Calendar

A Note on Weight-Loss Injections

Many men in senior roles now use GLP-1 drugs such as semaglutide or tirzepatide. In trials that measured body composition, a meaningful share of the weight lost was lean mass, with estimates ranging from roughly a quarter to two-fifths of the total. Whether all of that is functionally important muscle is debated.

For CHROs and People Leaders: What This Means for a Programme

The business case for muscle is plausible but not proven in the way a CFO would like. No trial has randomised executives to a strength programme and measured revenue. The indirect evidence is this: strength predicts long-term disease risk, which shapes the length of a leader's productive career and the cost of an unplanned absence. Resistance training improves insulin sensitivity, blood pressure and, in several trials, sleep. Recovery from illness and surgery is better in people with more strength beforehand.

Be careful, too, about what the wellness literature says. A randomised trial published in JAMA in 2019, across 160 worksites of a large retailer, found more reported healthy behaviours after 18 months but no significant change in clinical measures, healthcare spending or absenteeism. The Illinois Workplace Wellness Study found something similar. Opt-in programmes with step challenges, annual screens and a lunchtime talk tend to reach people who are already healthy.

A more defensible approach has four parts: a baseline for the senior team covering grip strength, chair rise, waist, a body composition measure and the usual blood markers; a simple strength programme of two sessions a week that works in a hotel gym or at home; a protein-aware food environment at offsites, in canteens and in travel guidance; and a review at 6 and 12 months using the same measures, so the programme has a visible before and after. Notice what this does that a conventional programme does not. It starts with measurement and ends with measurement. That gives a CHRO a number to show a CFO that is not a participation rate. No return on investment figure should be quoted without a source, and none is claimed here.

What to take from this

A fall, a hospital stay or a new diagnosis at 58 is rarely a sudden event. It is usually the visible end of a loss that started 15 years earlier and was never measured. The useful question for a leader at 45 is not whether he looks fit. It is whether he knows his grip strength, his chair rise time and how much lean mass he has, and whether he would know in five years if they had changed.

Common Questions on Muscle Mass and Longevity