muscles health library
Use the muscle. Feed the muscle. Protect the muscle.
Protein and muscle thorugh midlife: why both matter more than simple eating less.
Midlife can change the conversation around food.
For many women, the focus has traditionally been on eating less, weighing less and trying to keep calories under control.
But as we move through perimenopause, menopause and later life, another question becomes increasingly important:
Are we doing enough to preserve muscle?
Muscle supports much more than strength.
It contributes to movement, physical independence, glucose regulation, body composition and long-term metabolic health.
Protein provides the amino acids needed to maintain and repair muscle tissue, but protein alone does not build strong muscle.
Muscle needs both a stimulus and the raw materials to respond.
That means thinking about resistance training and adequate nutrition together.
In brief
Through midlife:
- maintaining muscle becomes increasingly important
- ageing can make preserving lean tissue more challenging
- resistance exercise gives muscle a reason to adapt
- dietary protein provides amino acids required for muscle repair and maintenance
- eating more protein without using your muscles is not a complete strategy
- protein needs vary according to body size, activity, health and overall diet
- total diet quality matters alongside protein
- muscle is relevant to metabolic health, not simply appearance
The goal is not to become obsessed with grams of protein.
It is to make sure your diet and lifestyle are working together to support the muscle you want to keep.
Why does muscle matter so much in midlife?
Muscle is often talked about in terms of appearance or fitness.
Physiologically, it does far more.
Skeletal muscle helps you:
- move and remain physically independent
- maintain strength and balance
- support bone through mechanical loading
- store and use glucose
- maintain aspects of metabolic health
- recover from illness and inactivity
- continue doing the things you want to do as you age
NICE menopause guidance specifically highlights maintaining muscle mass and strength through physical activity.
I think this deserves much more attention in women's health.
For years, many women have been encouraged to make themselves smaller.
Through midlife, I would rather see the conversation shift towards becoming stronger, better nourished and metabolically healthier.
What happens to muscle as we age?
Muscle mass and strength tend to decline with age.
The rate and timing vary enormously between individuals, and factors such as activity, nutrition, illness, hormonal changes and genetics all contribute.
Menopause may be part of that picture, but it is not helpful to assume that falling oestrogen is the sole reason for changes in muscle.
Ageing, reduced physical activity and inadequate dietary intake can also contribute.
Research in postmenopausal women has identified physical inactivity and lower protein intake among potentially modifiable contributors to muscle loss and declining strength.
The useful message is not that muscle loss is inevitable.
It is that muscle needs ongoing stimulus.
Muscle needs a reason to stay
Your body adapts to what you ask it to do.
If muscle is regularly challenged, the body has a reason to maintain and adapt that tissue.
If it is rarely challenged, there is less stimulus to retain it.
This is why resistance training becomes so valuable through midlife.
Resistance exercise can include:
- free weights
- resistance machines
- resistance bands
- bodyweight movements
- appropriately progressed home exercise
NHS guidance recommends strength exercise through menopause, and resistance or weight-bearing exercise is also important for bone health.
You do not need to become a bodybuilder.
You need to give your muscles enough challenge to create an adaptation.
What role does protein play?
Muscle tissue is continuously being broken down and rebuilt.
Protein in food is digested into amino acids, which the body can use for many different functions, including building and repairing body tissues.
That is why protein matters.
But there is an important distinction:
Protein provides the building materials. Resistance training provides the instruction to build.
Research across adults suggests that increasing protein intake can add modest benefits to lean mass and strength when combined with resistance exercise, although the size of the effect varies and more protein is not always better.
Studies specifically in postmenopausal and older women also show that simply increasing protein does not consistently produce additional muscle gain when habitual intake is already adequate.
That is why I don't start with:
“How much protein can we squeeze into your diet?”
I start with:
Are you getting enough?
Where is it coming from?
How is it distributed through the day?
Are you resistance training?
Are you eating enough overall to support your goals?
How much protein do women need?
There is no single perfect protein number for every woman in midlife.
Needs can vary according to:
- body weight
- age
- activity level
- resistance training
- appetite
- total calorie intake
- health status
- kidney function
- weight-loss goals
- recovery from illness or injury
The UK adult Reference Nutrient Intake for protein is designed to prevent deficiency in the general population, but research into ageing and resistance training often examines higher intakes when the goal is preserving or building lean tissue.
Importantly, higher is not automatically better.
In resistance-training studies, benefits appear to plateau rather than increasing indefinitely, and individual trials in postmenopausal women have not consistently found that pushing protein substantially higher produces extra muscle gain.
So I prefer to use protein targets in context, rather than turning them into a universal prescription.
Distribution matters too
Many people eat relatively little protein at breakfast and lunch, then consume most of it at dinner.
In practice, I often look at whether protein is spread more evenly across meals.
That does not mean there is a magical meal timing window.
A controlled trial in postmenopausal women found that protein timing around resistance training did not materially change gains in lean mass, strength or function.
So rather than worrying about the exact minute you eat protein, I am generally more interested in whether:
- you are meeting your overall needs
- meals contain a meaningful protein source
- your diet is practical and enjoyable
- your training provides an adequate stimulus
Consistency matters more than perfection.
What does a protein-rich meal actually look like?
Protein does not have to mean chicken breast and protein shakes.
Useful protein sources may include:
Animal sources
- eggs
- fish
- yoghurt
- cottage cheese
- milk
- poultry
- lean meat
Plant sources
- beans
- lentils
- chickpeas
- tofu
- tempeh
- edamame
- nuts and seeds
Plant-based diets can absolutely provide adequate protein, although planning may require a little more attention to total intake and variety.
Do you need protein powder?
Not necessarily.
Protein powders can be convenient, particularly when appetite, time or dietary preferences make it difficult to obtain enough protein from meals.
But they are not essential.
Food offers protein alongside other nutrients and is usually my starting point.
A supplement should solve a useful problem.
For example:
“I struggle to eat enough at breakfast.”
or
“I am training regularly but find it difficult to meet my protein needs through food.”
That is more useful than adding a protein shake simply because it is marketed to women over 40.
Muscle and blood glucose
This is one reason I talk so much about muscle in metabolic health.
Skeletal muscle is an important site for glucose uptake.
When muscles contract during activity, they use energy and can increase glucose uptake.
This means muscle is not simply something we want for appearance or strength.
It forms part of how the body handles glucose.
This is especially relevant when we are thinking about:
- insulin sensitivity
- blood glucose regulation
- body composition
- metabolic health through midlife
So when someone comes to me concerned about metabolic health, I am interested not only in what they eat.
I also want to know:
How much muscle are they using?
How often are they resistance training?
How much are they moving during the rest of the day?
[Explore: What is insulin resistance? →]
Why eating less can sometimes work against the bigger goal
If body weight increases through midlife, reducing food intake is often the first response.
Sometimes a calorie deficit is appropriate.
But the quality of that weight loss matters.
During weight loss, the body can lose both fat and lean tissue.
Recent meta-analysis in adults with overweight or obesity suggests that higher protein intake during weight loss may help reduce loss of muscle mass, although effects on strength and physical function are less clear.
Resistance training is also important because it gives the body a reason to retain lean tissue.
This is why my focus is not simply:
How quickly can weight come off?
I want to know:
What are we trying to lose?
What are we trying to protect?
For many women, the answer is:
reduce excess fat while preserving as much muscle as possible.
That is a very different strategy from simply eating less.
Protein, muscle and body composition
The number on the scales cannot tell you whether weight change has come from:
- fat
- muscle
- water
- bone
Two women of the same body weight can have very different body composition.
That is why I increasingly think in terms of:
body composition rather than body weight alone.
A successful midlife strategy might involve:
- little change on the scales
- reduced waist circumference
- improved strength
- more muscle
- less fat mass
- improved metabolic markers
If we only measure success by body weight, we may miss meaningful improvements.
[Explore: What is visceral fat? →]
What about bone?
Muscle and bone are closely connected.
When muscles pull against bone during resistance or weight-bearing exercise, that mechanical loading helps support bone strength.
This becomes especially relevant around and after menopause, when bone health deserves greater attention.
NHS osteoporosis guidance highlights resistance and weight-bearing exercise as important for bone density.
Protein also forms part of a nutritionally adequate diet, but bone health depends on a wider picture including factors such as:
- resistance and weight-bearing exercise
- calcium intake
- vitamin D
- energy availability
- smoking
- alcohol
- hormones
- medical history
Again, there is rarely one magic nutrient.
What I look at in practice
When I work with a woman who wants to improve body composition or metabolic health, I don't begin with a generic high-protein diet.
I look at the wider pattern.
What are you currently eating?
How much protein is actually present?
Is breakfast mostly carbohydrate?
Is lunch light enough that hunger becomes difficult later in the day?
Are meals satisfying?
What are you doing with your muscles?
Walking is valuable, but it does not replace progressive resistance training.
I want to know whether there is a meaningful strength stimulus somewhere in the week.
Are you eating enough overall?
Chronically under-eating while trying to train harder can create its own problems.
What is your goal?
Weight loss?
Better body composition?
Strength?
Healthy ageing?
Improved glucose regulation?
The strategy should reflect the goal.
What else is happening?
Sleep, stress, menopausal symptoms, medication, digestive issues and medical conditions can all influence what is realistic and appropriate.
Jo's perspective
One of the biggest changes I would like to see in women's midlife health is a move away from asking only:
“How can I weigh less?”
towards asking:
“How can I remain strong, metabolically healthy and physically capable as I age?”
Protein is part of that conversation.
But protein without enough movement — particularly resistance training — misses half the story.
Likewise, training hard without adequate nutrition may make it harder to support recovery and adaptation.
My aim is to bring those pieces together.
Use the muscle. Feed the muscle. Protect the muscle.
Not for aesthetics alone.
For the decades ahead.
Practical ways to support muscle through midlife
For many women, useful foundations include:
- include a meaningful protein source at each main meal
- spread protein across the day rather than leaving most of it until dinner
- resistance train regularly
- gradually increase the challenge rather than repeating the same easy exercises indefinitely
- maintain everyday movement
- eat enough overall to support your health and activity
- pay attention to sleep and recovery
- consider protein supplements only where they solve a genuine practical problem
You do not need to optimise every meal.
You need a pattern that you can maintain.
When might personalised support be useful?
You may benefit from individualised nutritional support if you are:
- struggling with body-composition changes through midlife
- losing weight but concerned about preserving muscle
- unsure how much protein is appropriate for you
- moving towards a more plant-based diet
- beginning resistance training
- dealing with digestive issues that make protein intake difficult
- managing medical conditions or medications that affect dietary recommendations
If you have kidney disease or another medical condition that may affect protein requirements, protein intake should be discussed with an appropriate healthcare professional.
Connect the dots
Perimenopause and metabolism
Why hormonal change, ageing, sleep, muscle and activity all belong in the same conversation.
[Read the guide →]
What is insulin resistance?
Understand why muscle is important for glucose regulation.
[Read the guide →]
What is visceral fat?
Why body composition can tell us more than body weight alone.
[Read the guide →]
Blood glucose and HbA1c
Understand the markers used to assess longer-term glucose regulation.
[Read the guide →]
Want help supporting your body composition through midlife?
Your Body Library can explain the science.
Personalised nutritional therapy helps apply it to you.
Together, we can look at your current diet, activity, body-composition goals, health history and relevant results to identify where changes may be most useful.
Book a discovery call →
This page is for educational purposes and is not a substitute for personalised medical advice, diagnosis or treatment.
References & further reading
- NICE. Menopause: identification and management (NG23). Guidance includes the importance of maintaining muscle mass and strength through physical activity.
- NHS. Things you can do to help menopause and perimenopause.
- NHS. Osteoporosis: prevention.
- Nunes EA et al. Systematic review and meta-analysis of protein intake and resistance exercise. 2022.
- Morton RW et al. Protein supplementation and resistance training: systematic review, meta-analysis and meta-regression. 2018.
- Ioannidou P et al. Resistance training, higher-protein diets and outcomes in postmenopausal women. 2024.
- Kuo YY et al. Whey protein supplementation in postmenopausal women: systematic review and meta-analysis. 2022.
- Maltais ML et al. Changes in muscle mass and strength after menopause. 2009.