Your Metabolic Age May Matter More Than Your Birthday

You might be 27 on your birth certificate. But what if your body is already showing signs of aging faster than it should?

And on the other hand, what if you are 27 and your body is functioning exceptionally well because you have built good muscle, stayed active, eaten well and taken care of your metabolic health?

This is where the idea of metabolic age becomes interesting.

You may have seen it on a smart scale or a body composition report.

“Your metabolic age is 31.”

“You are 27, but your metabolic age is 24.”

It sounds impressive.

But before we start celebrating or worrying about that number, there is something important we need to understand.

Metabolic age is not a medical diagnosis. It is an estimate.

But the idea behind it raises a much more useful question: "How healthy is your metabolism for the age you are?"

Because two people can both be 27 and have completely different bodies. One may have good muscle mass, good cardiovascular fitness, a healthy waist circumference and good blood sugar control.

The other may spend most of the day sitting, have very little muscle, carry excess abdominal fat, sleep poorly and already have some metabolic risk factors.

Same birthday. Very different biology.

And that is the conversation I want to have.

What exactly is metabolic age? 

Let's clear this up first. 

Metabolic age is not the same thing as your chronological age. Your chronological age is simply how many years you have been alive. 

Your metabolic age is an estimate that some smart scales and body-composition devices calculate using measurements such as your age, weight, body composition and estimated resting metabolic rate.

So if you are 27 and the machine says your metabolic age is 35, it can sound as though your body has somehow aged eight years faster.

But that is not what it means. These devices are making an estimate.

Different devices can use different formulas and body composition measurements can be affected by factors such as hydration, food intake and exercise. So I would never look at that number and say: “Your body is eight years older than it should be.” That would be taking the number far too literally. 

Instead, I think the idea is useful because it gets us thinking about something much bigger.

How well is your body functioning? 

Because your metabolism is not just the number of calories you burn while sitting on the sofa. It is much more complicated than that.

Your metabolism is doing a lot more than burning calories. 

Even while you are reading this, your body is using energy.

• Your heart is beating.

• Your lungs are working.

• Your brain is active.

• Your organs are functioning.

• Your body is maintaining its temperature.

• Your cells are carrying out thousands of processes.

All of that requires energy.

Your resting metabolic rate tells us roughly how much energy your body needs to maintain these basic functions while at rest.

And yes, resting metabolic rate can change with age. 

But aging is not simply a story of your metabolism suddenly slowing down because you had a birthday.

Your body composition matters.

Your muscle mass matters.

Your physical activity matters.

Your overall health matters.

And that is why I don't want anyone to become obsessed with a “metabolic age” number from a bathroom scale.

The number is not the goal.

Your health is the goal.

Your weight doesn't tell the whole story

This is something I keep coming back to when we talk about health. 

We have become very comfortable using weight as the main measurement.

You step on a scale.

You see 70 kgs.

Or 80 kgs.

Or 90 kgs.

And immediately you decide whether you are doing well or badly.

But let me give you two people who both weigh 80 kgs. One has good muscle mass, stays active and carries relatively little fat around the abdomen.

The other has very little muscle, spends most of the day sitting and carries a lot of fat around the waist.

Same weight.

Very different bodies. And potentially very different metabolic health. 

This is why I would rather look at the bigger picture.

Your waist circumference. 

Your blood pressure.

Your blood glucose.

Your triglycerides.

Your cholesterol.

Your body composition.

Your strength.

Your cardiovascular fitness.

Your sleep.

These tell us much more than body weight alone. 

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Your waist can tell you something your weighing scale cannot.

Where you carry your body fat matters. In particular, excess abdominal fat is associated with a higher risk of metabolic problems.

The American Heart Association includes increased waist circumference as one of the major risk factors used to identify metabolic syndrome, along with high blood glucose, high triglycerides, low HDL cholesterol and high blood pressure.

Having several of these risk factors together increases the risk of conditions such as cardiovascular disease, stroke and type 2 diabetes.

Notice something?

The conversation is not simply: “You weigh too much.”

There is much more to metabolic health than that. This is also why someone can have a BMI that appears normal and still have metabolic risk factors.

BMI can be useful as a screening tool. But it doesn't tell us how much of your body weight comes from muscle or fat. It doesn't tell us where your fat is stored. And it doesn't tell us how fit you are.

So don't let one number decide how healthy you are. 

This is where muscle changes the conversation.

We often talk about muscle because of how it looks.

Bigger arms.

A better physique. 

A flatter stomach.

But muscle is much more than appearance. 

Your skeletal muscles are one of the major places where glucose is taken up from your bloodstream. That makes muscle very relevant to metabolic health.

Muscle also helps you move.

It helps you maintain strength.

It helps you maintain balance.

It helps you remain independent as you get older.

And this becomes increasingly important with age.

Age-related loss of muscle and strength is known as sarcopenia.

We should not simply accept it as: “Well, I'm getting older. Of course I'm getting weaker.”

There is a lot we can do to maintain muscle.

Resistance training is one of the most important tools. And you don't have to be a bodybuilder. You don't need to spend two hours in a gym.

You can start with your own body weight.

Squats.

Push-ups.

Rows.

Lunges.

Resistance bands.

Weights.

The goal is to give your muscles a reason to stay strong.

Think about two 60 year olds. 

Imagine two people who are both 60. One has spent the last 20 years sitting at a desk, rarely exercising and gradually losing muscle. The other walks regularly, stays active and does resistance training a few times a week. Their birthdays say exactly the same thing. Their bodies may not.

One may struggle to get up from the floor. The other may be able to squat down, stand back up and continue walking without thinking twice about it.

That difference is important.

Because healthy aging isn't just about how long you live. It is also about how well you can function while you are alive. You cannot stop aging. But you can influence how you age.

Nobody can stop the clock.

I cannot give you a diet that changes your birth certificate from 60 to 40. But we can influence many of the things that determine how well our bodies function as we get older.

You can build muscle.

You can improve your cardiovascular fitness.

You can reduce excess abdominal fat.

You can eat better.

You can sleep better.

You can become more physically active.

You can manage your blood pressure.

You can monitor your blood glucose and cholesterol.

You can stop smoking.

You can reduce excessive alcohol consumption.

None of these things makes you chronologically younger. But they can help you become healthier for the age you are.

And I think that is a much better goal.

Your physical function is telling you something. 

Here's something I want you to think about. Forget the smart scale for a minute.

Stand up from a chair. Was that easy?

Walk up a flight of stairs. How do you feel when you reach the top?

Get down onto the floor. Can you get back up without pulling yourself up using furniture?

Stand on one leg. How stable are you?

These aren't perfect tests of metabolic age. But they tell you something about your physical function. And physical function matters. Clinical approaches to muscle health and sarcopenia use measures such as grip strength, gait speed and chair-stand performance to assess strength and physical performance. So I would much rather know that you can move well, maintain your strength and perform everyday activities than simply know that your smart scale says: “Metabolic age: 42.”

Now let's talk about the squat test.

There is a simple movement that has become popular in conversations about metabolic age.

The squat.

• Stand with your feet roughly shoulder-width apart.

• Lower yourself into a comfortable squat.

• Then stand back up.

You can also see how comfortable you are holding the position. It is a useful movement to try because a squat requires several things at the same time.

Strength.

Mobility.

Balance.

Coordination.

And control.

But I want to make something very clear.

A squat is not a scientifically validated metabolic-age test. If you can hold a squat for 60 seconds, it does not mean your metabolic age is automatically 10 or 20 years younger. If you struggle after 20 seconds, it does not mean your metabolic age is 20 years older.

We should not turn a simple movement into a medical diagnosis. But the movement itself can still tell you something useful.

If you struggle to squat, ask why.

Is your leg strength poor?

Is your ankle mobility limited?

Are your hips stiff?

Do you have pain?

Is your balance poor?

Have you simply never trained the movement? 

Those are much better questions. Because they give you something you can actually work on.

Why muscle is so important for metabolism.

Let's get back to muscle. 

When you eat carbohydrates, glucose enters your bloodstream. Your muscles can take up that glucose and use it for energy or store it. Physical activity and muscle contraction increase glucose uptake by skeletal muscle.

This is one of the reasons regular movement is so important for metabolic health. And it is one reason why maintaining muscle as you age matters.

Less muscle can mean less strength.

Less strength can mean less activity.

Less activity can mean even more loss of muscle.

And suddenly you can find yourself in a cycle.

You move less.

You get weaker.

Movement becomes harder. So you move even less.

This is one of the reasons I want people to start resistance training before they think they need it.

Don't wait until you are 60 and struggling to carry your bags. Build the strength before you need it.

What about flexibility?

The ability to squat comfortably also depends on mobility. But again, let's keep the science honest.

If you cannot get into a deep squat, it does not automatically mean you have chronic inflammation. It does not prove that your connective tissue is “metabolically old”.

There could be many reasons.

• You may have limited ankle mobility.

• Your hips may be stiff.

• You may have an old injury.

• You may have pain.

Or you may simply never have practiced the movement.

But mobility still matters.

If your body becomes difficult to move, you may naturally start moving less. And when movement decreases, strength and fitness can suffer.

That is why I like looking at the whole picture.

• Strength.

• Mobility.

• Balance.

• Cardiovascular fitness.

You don't need to be exceptional at all of them. You just need enough physical capacity to live the life you want. 

And then there are your mitochondria.

You have probably heard people talk about mitochondria as the “powerhouses” of the cell.

There is a reason for that.

Mitochondria are involved in producing the energy your cells need. Mitochondrial function changes with ageing and is also affected by disease and physical activity. Exercise can stimulate beneficial adaptations in skeletal muscle, including adaptations related to mitochondrial function. 

But this is another area where social media can take a useful concept and turn it into an exaggerated claim. If your legs burn after 30 seconds of squatting, it does not mean you have mitochondrial dysfunction.

You are probably just tired.

Your body is more complicated than that.

We don't need to turn every normal sensation into a diagnosis.

Your metabolic health is shaped by much more than your age or the number on your weighing scale.

Your food matters. 

Your protein intake matters. 

Your fiber intake matters. 

Your exercise matters. 

Your muscles matter. 

Your sleep matters. 

Your recovery matters. 

Even the way you manage stress can influence how your body functions over time.

And you don't need to do all of this perfectly.

You don't need a complicated diet.

You don't need to eliminate every carbohydrate.

You don't need to live on salads.

And you don't need another supplement promising to “boost” your metabolism.

Start with the basics.

Eat enough protein to support your needs. 

Get enough fiber. Include vegetables and fruits. 

Choose minimally processed foods most of the time. 

Stay physically active. Build and maintain muscle. 

Get enough sleep. 

And keep an eye on important health markers such as blood pressure, blood glucose, cholesterol and waist circumference.

These are the things that actually give you a better picture of your health. And don't wait until you are 50 to start thinking about this.

If you're in your 20s or 30s, you have an enormous opportunity to build habits that your future self will benefit from. Learn how to eat well now. Start strength training now. Stay active now. Protect your sleep now.

If you're already 40, 50 or 60, don't think you've missed your chance. You haven't. Your body can still adapt.

Muscles can become stronger. Fitness can improve. Your diet can improve. Your sleep can improve. Your waist circumference can change. Your blood pressure and blood glucose can improve with the right lifestyle changes and appropriate medical care.

That is why I don't want you to become obsessed with making your “metabolic age” younger.

Instead, ask yourself a better question: "How can I make my body stronger and healthier for the age I am?" Because imagine your smart scale tell you that your metabolic age is 35 when you are 45 but you struggle to climb a flight of stairs.

What have you really achieved?

And imagine another 45 year old whose smart scale says 50 but they have good strength, good cardiovascular fitness, healthy blood pressure and good metabolic markers.

Should they panic because of one number? Probably not.

The number is a clue. It is not the verdict.

Your birthday tells you how long you've been alive.

Your metabolic health tells you something much more useful that is how well your body is handling those years.

So don't spend your life trying to become younger.

Try to become stronger.

Try to become fitter.

Try to become healthier.

Try to remain capable of doing the things you love, with the people you love, for as long as possible.

Because you cannot change your birthday. But you can influence how you arrive at the next one.

A qualified dietitian or nutritionist can look at your health, lifestyle, food preferences, sleep goals and nutritional needs and help build a plan around you, rather than asking you to fit into a generic diet.

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