If you want to know what women really notice about a man's body, forget the fitness industry's obsession with getting bigger.

Researchers have spent decades asking women to rate male bodies, measuring everything from shoulder width and waist size to muscle and body fat.

And the results reveal something most men probably don't expect.

Women don't simply prefer the man with the biggest muscles.

The research points towards a particular combination of body shape, muscularity and body composition.

And if you're over 40, there's a very good reason to pay attention.

Because the physique women tend to find attractive is also the physique that can become harder to maintain with age.

What male body shape do women find most attractive?

Research suggests women tend to find a male physique with broader shoulders, a relatively narrow waist, visible muscularity and a relatively lean body composition attractive.

But the evidence doesn't suggest that maximum muscularity is the goal.

It's the combination that matters.

And the science gets more interesting from there.

First, let's talk about the V

Think about the male physique women tend to describe as attractive.

Broad shoulders.

A developed chest.

A narrower waist.

A body that tapers from the upper torso down towards the waist.

The classic V-shaped male physique.

This isn't just gym folklore.

In a study of 151 women, researchers created male body avatars from real 3D body scans and asked the women to rate their attractiveness. Men with a lower waist-to-chest ratio, meaning a broader chest relative to their waist, were rated as more attractive.

But then researchers discovered something even more interesting.

Women also perceived men with this body shape as fitter, more physically dominant and better able to protect loved ones. These perceptions helped explain why the body shape was attractive for both short-term sexual attraction and longer-term relationships.

It's not simply the muscle. It's the shape the muscle creates.

A bigger chest only helps create the V-shape if the waist stays relatively narrow.

So two men can have a similar amount of muscle and still look very different.

And women may perceive them very differently too.

Then researchers looked at the brain

The V-shape finding isn't isolated.

A 2023 EEG study showed men and women computer-generated bodies with different shoulder-to-hip ratios while measuring both attractiveness ratings and brain activity.

Larger shoulder-to-hip ratios were rated as more attractive than smaller ratios. Different male body shapes also produced different patterns of neural activity during both early and later stages of processing.

So the broad-shouldered male physique isn't simply something men have convinced themselves women like.

Different male body proportions produce different attractiveness responses.

Your proportions matter, not just your size.

That's worth remembering the next time you look in the mirror and think:

"I need more muscle."

Maybe.

But you might also need to ask:

What's happening around my waist?

Here's the part most men won't expect

If women find muscular men attractive, it's tempting to assume that more muscle must mean more attractive.

The research doesn't support such a simple equation.

A 2016 PLOS ONE study allowed participants to manipulate the apparent muscle and fat levels of male and female bodies independently. The male bodies associated with the highest attractiveness were broadly within physiologically healthy body-composition ranges rather than simply being the most muscular possible.

Women weren't simply selecting the biggest male body.

The relationship between muscle and body fat mattered.

So the target isn't necessarily:

Maximum muscle.

It's closer to:

Enough muscle + controlled body fat + the right proportions.

And that brings us to perhaps the most revealing finding.

Body fat may matter more than you think

A 2025 study examined male body fat, BMI and shoulder-to-waist ratio using DXA images in participants from China, Lithuania and the UK.

The researchers found a peaked relationship between body fat and male attractiveness. Attractiveness did not simply increase as men became progressively leaner.

Both body fat and shoulder-to-waist ratio were associated with attractiveness. But when the researchers considered the two together, body fat explained more of the variation in attractiveness across all three populations.

That's a surprising finding if you've spent years thinking the answer is simply:

Build bigger shoulders.

Getting leaner isn't the whole answer. Getting leaner while keeping your muscle is.

That's an important distinction.

Losing weight isn't necessarily the same as improving your physique.

If you lose both fat and muscle, the number on the scales may improve while the V-shape you're trying to create becomes less pronounced.

The goal isn't simply to weigh less.

It's to improve the relationship between muscle and body fat.

So what do women actually find attractive?

When the research is put together, the picture becomes remarkably consistent:

Broader shoulders.

A relatively narrow waist.

Visible muscularity.

A relatively lean body composition.

Not necessarily the biggest man in the gym.

Not necessarily the man with the lowest possible body fat.

The strong, lean, V-shaped male physique.

And there's another fascinating piece of research.

A 2022 study involving 891 participants found that body shape influenced the sexual characteristics people attributed to the person they were looking at. The researchers weren't saying those assumptions were necessarily accurate. They demonstrated that body shape influenced the impressions people formed about sexual characteristics.

So when a woman looks at a man's body, she isn't necessarily calculating his waist-to-chest ratio.

She sees the whole picture.

And that overall shape can influence how attractive she finds him.

Now consider what happens after 40

This is where the research suddenly becomes very practical.

If you're a man in your 40s or 50s, there's a good chance you've already noticed the problem.

You haven't necessarily stopped training.

You may even be training as hard as ever.

But your body doesn't respond quite like it used to.

The waist seems to find fat more easily.

Muscle takes longer to build.

Time away from the gym seems to cost you more.

And the physique that once looked naturally athletic can gradually become less V-shaped.

That's not simply a failure of discipline.

Age changes the muscle-building equation.

Your muscles need a stronger signal after 40

Here's the part most men don't know.

As you get older, eating protein isn't necessarily enough to produce the same muscle-building response you got when you were younger.

This is part of what scientists mean by anabolic resistance. Ageing muscle can become less responsive to the anabolic stimulus from a meal, making the quality and composition of that meal increasingly important.

And one amino acid is particularly important.

Leucine.

Leucine acts as a key nutritional signal involved in activating the machinery responsible for muscle protein synthesis. Research in older adults has led to a practical target of around 3 g of leucine per meal, alongside an adequate amount of high-quality protein.

After 40, it's not just how much protein you eat. It's whether you give your muscles a strong enough signal to use it.

This changes the way you should think about protein.

A meal can contain plenty of protein, but the amount and quality of the amino acids that stimulate muscle protein synthesis matter too.

Whey is particularly useful here because it is naturally rich in leucine, and research in older adults has shown that leucine-enriched whey can effectively stimulate muscle protein synthesis.

As you get older, each protein feeding needs to do more work.

So what does this mean in practice?

If you're over 40 and trying to maintain muscle, the protein you eat needs to deliver more than just a big number on the label.

You want enough total protein.

You want high-quality protein.

And you want enough leucine to provide a meaningful muscle-building signal.

Around 3 g of leucine per meal is a useful practical target for older adults.

And this is where 40UP gets interesting.

Why 40UP contains 3.5 g of leucine

40UP was deliberately formulated around the nutritional challenges of maintaining muscle after 40.

Every 60 g serve provides:

• 35.7 g protein
• 3.5 g leucine
• 3 g creatine
• 10 g Peptan hydrolysed collagen
• Glycine
• MCTs
• Prebiotic fibre

The important number for this story is 3.5 g of leucine.

That's not an arbitrary addition.

It's there to provide a substantial leucine dose alongside a high-quality protein serving.

So 40UP isn't simply another protein shake.

It's a deliberately formulated nutritional approach to supporting muscle as the body gets older.

And that's important because the muscle you're trying to maintain isn't just about strength.

It's also part of the physique women tend to find attractive.

What male body shape do women find most attractive?

The research doesn't point to maximum muscle.

It points towards a combination of broad shoulders, a relatively narrow waist, visible muscularity and a relatively lean body composition.

The classic V-shaped male physique.

The challenge is that maintaining that combination becomes harder as you get older.

So don't obsess over trying to look 25.

Train your muscles. Keep body fat under control. Eat enough protein. Make sure each protein feeding delivers enough leucine. And use nutrition strategically as you get older.

Because if you still want women to look at you and see a strong, fit and attractive man, there's no reason to assume your best physique is behind you.

Getting older is inevitable.

Letting your physique disappear with it isn't.

Frequently asked questions

What male body shape do women find most attractive?
Research suggests women tend to find broader shoulders, a relatively narrow waist, visible muscularity and a relatively lean body composition attractive. The evidence does not suggest that maximum muscularity is necessarily preferred.

Do women prefer muscular men?
Research suggests that women tend to find muscular male physiques attractive, but more muscle does not automatically mean greater attractiveness. The combination of muscularity, body fat and body proportions appears to matter.

Do women prefer broad shoulders?
Research on male waist-to-chest and shoulder-to-hip ratios supports the attractiveness of a broader upper body relative to the waist or hips.

Does body fat affect how attractive men are?
Yes. A 2025 study found a non-linear relationship between male body fat and attractiveness and found that body fat explained more variation in attractiveness than shoulder-to-waist ratio when both were considered together across three populations.

Does it get harder to maintain muscle after 40?
Ageing is associated with changes in the muscle's response to dietary protein and other anabolic stimuli. This makes resistance training, adequate protein and appropriate nutritional support increasingly important for maintaining muscle as you age.

Want to keep learning?

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• Metabolic Collagen: Why the Next Generation of Collagen Peptides Could Change Weight Management
• The Shocking Truth About Muscle Loss After 40: Science Says It Starts Decades Earlier Than You Think
• Best Protein Powder for Men Over 40: Beat Anabolic Resistance and Build Lean Muscle