If you've noticed it's harder to carry the shopping, climb stairs or bounce back from a workout, you're feeling the early edge of a process that quietly compounds over the years. The encouraging part: the same levers that slow it work at almost any age.
What is sarcopenia?
Sarcopenia is the progressive, age-related loss of muscle mass, strength and physical function. The word comes from the Greek for "flesh" and "loss." It isn't a disease you either have or don't — it's a gradual slide that begins in your 30s, becomes measurable through your 40s and 50s, and picks up speed in later decades.
Why does muscle loss accelerate after 40?
Several changes stack up around this age:
Anabolic resistance. As you age, your muscles respond less efficiently to the usual signals to build and repair — meaning the same meal or workout produces a smaller muscle-building response than it did in your 20s.
Hormonal shifts. Changes in hormones, including the drop in oestrogen after menopause and gradual declines in testosterone and growth factors, reduce the body's drive to maintain muscle.
Less activity — and less resistance activity in particular. Many adults become less active with age, and crucially do less strength-based movement. Without regular mechanical load, the body has little reason to keep muscle it isn't using.
Lower protein intake. Appetite and protein intake often fall with age, right when your requirements are effectively rising due to anabolic resistance.
How much muscle do you actually lose?
3–8%
muscle mass lost per decade after 30–40
~15%
per decade once past roughly 70
faster
strength declines quicker than mass itself
One detail is easy to miss but important: strength tends to decline faster than muscle size. That's why power, balance and the ability to catch yourself in a stumble can fade even before there's obvious change in how you look.
Why it matters beyond strength
Muscle is metabolic infrastructure. It acts as a major site for clearing sugar from your blood, so losing it is linked with insulin resistance. It helps set your resting metabolic rate, so less muscle can mean easier fat gain over time. It supports bone density and protects against the falls and fractures that genuinely threaten independence later in life. Protecting muscle after 40 is, in a real sense, protecting your future mobility and metabolic health.
How to fight back after 40
1. Lift something heavy, regularly
Resistance training is the single most effective intervention. Two to three sessions a week, working the major muscle groups, can slow and even reverse muscle loss at any age.
2. Eat enough protein — and spread it out
To overcome anabolic resistance, older adults benefit from a solid serve of protein at each meal rather than loading it all into dinner.
3. Stay generally active
Walking, gardening and daily movement support the foundation, even though they don't replace the specific stimulus of resistance work.
4. Use targeted muscle support
Nutrients with an anti-catabolic role, such as HMB, and the amino acids that drive repair can help counter the reduced muscle-building response that comes with age.
The reframe
Ageing is mandatory. Significant muscle loss is not — it's largely a question of the signals you keep sending your body.
Where Myofort fits
Myofort is designed to support muscle preservation during exactly the periods when your body is inclined to give it up — including the gradual pressure of ageing. Its myHMB® helps slow muscle breakdown, its BCAAs supply and signal repair, and KSM-66® ashwagandha supports recovery and resilience. Paired with resistance training and adequate protein, it's a way to keep the muscle-building signal switched on as the years add up.
If you're also managing weight, note that rapid weight loss can compound age-related decline — see our guide to muscle loss on GLP-1 medications.
Is it ever too late to start?
No. One of the most reassuring findings in this field is that muscle stays responsive to training throughout life — studies have demonstrated meaningful strength and muscle gains even in adults in their 80s and 90s, including frail individuals. Your muscles may respond a little more slowly than they once did, but they still respond. Whether you're 45 and getting ahead of the curve or 70 and rebuilding, the principles are identical: challenge your muscles regularly, feed them enough protein, and give them what they need to recover. The best time to start protecting your muscle was years ago; the second-best time is today.
Frequently asked questions
At what age does muscle loss really start?
It begins subtly in your 30s, becomes measurable through your 40s, and accelerates noticeably from around 60 onwards. Forty is a sensible age to start protecting it deliberately.
Can you reverse age-related muscle loss?
You can slow it substantially and rebuild a meaningful amount of muscle through resistance training and adequate protein — even in much older adults. Acting earlier simply means you're defending more.
Is cardio enough to protect my muscle?
On its own, no. Cardio is excellent for heart and metabolic health, but resistance training provides the specific stimulus muscle needs to be retained and built.
Do I need to lift heavy weights at my age?
Resistance can come from weights, bands or bodyweight, and programs can be tailored to any starting point. The key is progressively challenging your muscles — ideally with guidance if you're new to it.
Keep the muscle that keeps you moving
Myofort supports muscle preservation so you can stay strong, mobile and independent as the years go by.
Health disclaimer: This article is for general informational purposes only and is not medical advice. Myofort is a dietary supplement and is not intended to diagnose, treat, cure or prevent any disease, including sarcopenia. Individual results vary. Always consult a qualified healthcare professional before starting a new exercise program or supplement, particularly if you have an existing health condition.
