The Gut–Muscle Axis: How Protein, Prebiotics & Gut Health Support Strength, Recovery and Healthy Ageing
The Gut–Muscle Axis: How Protein, Prebiotics & Gut Health Support Strength, Recovery and Healthy Ageing
For decades, muscle health has been viewed through a relatively simple lens:
Eat enough protein.
Exercise regularly.
Recover well.
While these foundations remain essential, emerging research suggests there may be another important piece of the puzzle:
👉 Gut health.
Researchers are increasingly investigating what is known as the gut–muscle axis — the complex relationship between the gut microbiome, digestion, metabolism, inflammation and skeletal muscle function. Growing evidence suggests that gut health may influence how effectively the body digests, absorbs and utilises nutrients that support muscle maintenance and recovery.
This evolving area of research is reshaping how we think about:
-
Muscle health
-
Recovery
-
Healthy ageing
-
Metabolic health
-
Nutrition strategies
The result is a more integrated approach that recognises muscle health doesn't exist in isolation.
It depends on the health of the whole body.
What Is the Gut–Muscle Axis?
The gut–muscle axis describes the bidirectional relationship between the gut microbiome and skeletal muscle.
The gut microbiome consists of trillions of microorganisms living within the digestive tract that influence numerous aspects of human health including:
-
Digestion
-
Nutrient absorption
-
Immune function
-
Inflammation regulation
-
Energy metabolism
Researchers now believe these processes may also influence muscle mass, muscle function, recovery and physical performance.
At the same time, physical activity appears to influence the microbiome itself, creating a two-way relationship between movement and gut health.
Why Gut Health Matters for Muscle Health
Many people focus exclusively on how much protein they consume.
However, before protein can contribute to muscle maintenance and recovery, the body must:
-
Digest protein efficiently
-
Break it into amino acids
-
Absorb those amino acids
-
Deliver them to tissues
-
Utilise them effectively
A healthy digestive system helps support each of these processes.
Researchers continue to investigate how disruptions to the gut microbiome may influence:
-
Nutrient absorption
-
Inflammation
-
Recovery
-
Metabolic health
all of which may affect muscle health over time.
Protein: The Foundation of Muscle Health
Protein remains one of the most important nutrients for maintaining muscle mass and physical function.
Protein contributes to:
-
Muscle maintenance
-
Growth and repair
-
Hormone production
-
Enzyme production
-
Immune function
When protein is consumed, it is broken down into amino acids which are then used throughout the body.
Good protein sources include:
-
Fish
-
Eggs
-
Poultry
-
Lean meat
-
Dairy foods
-
Legumes
-
Nuts and seeds
Learn more:
What Are Prebiotics?
Prebiotics are specialised fibres that nourish beneficial bacteria within the gut.
Common prebiotic fibres include:
-
Inulin
-
Resistant starch
-
Fructooligosaccharides (FOS)
Prebiotics occur naturally in foods such as:
-
Garlic
-
Onion
-
Leeks
-
Asparagus
-
Legumes
-
Oats
-
Cooked and cooled potatoes
-
Cooked and cooled rice
When gut bacteria ferment these fibres, they produce compounds known as short-chain fatty acids (SCFAs).
Why Short-Chain Fatty Acids Matter
Short-chain fatty acids include:
-
Butyrate
-
Acetate
-
Propionate
Researchers continue to investigate how these compounds may influence:
-
Gut barrier integrity
-
Immune regulation
-
Metabolic health
-
Inflammation balance
SCFAs are considered one of the key mechanisms through which gut bacteria communicate with the rest of the body.
Protein and Prebiotics: Why They Work Well Together
Rather than viewing protein and prebiotics separately, many researchers now recognise that they may work synergistically within a healthy dietary pattern.
Protein provides:
-
Amino acids
-
Structural building blocks
-
Support for muscle maintenance
Prebiotics support:
-
Beneficial gut bacteria
-
SCFA production
-
Gut microbiome diversity
Together, these nutrients may help support the digestive and metabolic environment required for overall health and recovery. Researchers continue to investigate how the gut microbiome may influence protein utilisation and muscle health throughout life.
Where Bone Broth Fits
Bone broth is increasingly included within nutrition routines focused on recovery, healthy ageing and protein intake.
Broth & Co Bone Broth provides naturally occurring protein together with collagen-derived amino acids including:
-
Glycine
-
Glutamine
-
Proline
Bone broth can be incorporated into:
-
Soups
-
Stews
-
Sauces
-
Smoothies
-
Daily nutrition routines
Many people use bone broth as part of a food-first approach to supporting:
-
Digestive wellbeing
-
Recovery
-
Protein intake
-
Healthy ageing
Read more:
https://brothandco.com.au/blogs/news/bone-broth-benefits-complete-guide
The Broth & Co Clinical Study
Broth & Co Bone Broth Powder was evaluated in a clinical study conducted through the National Institute of Integrative Medicine (NIIM).
The study investigated daily bone broth consumption in Australian adults experiencing lower gastrointestinal disturbances.
Researchers observed improvements in:
-
Digestive wellbeing outcomes
-
Gastrointestinal symptom measures
-
Quality of life measures
-
Markers associated with intestinal permeability
following daily bone broth consumption.
Learn more:
https://brothandco.com.au/pages/study
Where Collagen Fits
Collagen is the most abundant structural protein in the body.
It contributes to structures including:
-
Skin
-
Bones
-
Tendons
-
Ligaments
-
Connective tissue
Collagen peptides provide collagen-derived amino acids including:
-
Glycine
-
Proline
-
Hydroxyproline
These amino acids complement overall protein intake as part of a balanced nutrition strategy.
Learn more:
Bone Broth vs Collagen vs Protein
BC Beauty Healthy Glow
BC Beauty Healthy Glow contains Peptan® B collagen peptides together with naturally occurring vitamin C-rich ingredients.
Ingredients include:
-
Kakadu Plum
-
Camu Camu
-
Acerola
-
Sea Buckthorn
-
Citrus Bioflavonoids
These ingredients contribute collagen-derived protein and antioxidant compounds as part of a healthy lifestyle and wellbeing routine.
BC Beauty Skinny Glow
BC Beauty Skinny Glow combines collagen peptides with complementary ingredients designed to support modern nutrition routines.
As part of a balanced diet and active lifestyle, it can be incorporated into broader strategies focused on:
-
Healthy ageing
-
Recovery
-
Protein intake
-
Everyday wellbeing
Exercise: The Other Half of the Gut–Muscle Axis
Exercise does more than build muscle.
Research suggests physical activity may also influence the gut microbiome itself. Studies have demonstrated changes in microbial diversity and short-chain fatty acid production following regular exercise.
Regular movement supports:
-
Muscle mass
-
Strength
-
Physical function
-
Metabolic health
-
Recovery
Learn more:
Exercise, Gut health & the Microbiome
Healthy Ageing, Sarcopenia and the Microbiome
As we age, natural changes occur in:
-
Muscle mass
-
Strength
-
Recovery capacity
-
Gut microbiome diversity
Researchers continue to investigate how nutrition, exercise and gut health may help support healthy ageing and physical function. The gut–muscle axis is emerging as an important area of interest in understanding age-related muscle loss (sarcopenia).
Learn more:
What are the Hallmarks of Aging
Building a Gut–Muscle Friendly Plate
A balanced meal may include:
Protein
-
Fish
-
Eggs
-
Poultry
-
Meat
-
Legumes
Prebiotic-Rich Foods
-
Garlic
-
Onion
-
Leeks
-
Oats
-
Legumes
Colourful Vegetables
-
Leafy greens
-
Broccoli
-
Carrots
-
Capsicum
Healthy Fats
-
Olive oil
-
Avocado
-
Nuts
-
Seeds
This combination supports overall dietary quality while providing nutrients that support both gut and muscle health.
Discover the Broth & Co Collection
Frequently Asked Questions
What is the gut–muscle axis?
The gut–muscle axis describes the relationship between the gut microbiome and skeletal muscle health.
Do prebiotics help muscle growth?
Research is ongoing. Prebiotics support beneficial gut bacteria and researchers continue to investigate how the microbiome may influence muscle function and protein utilisation.
Is protein still important for muscle health?
Absolutely. Protein remains one of the most important nutrients for maintaining muscle mass and supporting recovery.
Where does bone broth fit?
Bone broth provides naturally occurring protein and collagen-derived amino acids and can be included as part of a balanced eating pattern.
Can collagen replace dietary protein?
No. Collagen complements overall protein intake but should not replace complete protein sources such as fish, eggs, dairy, poultry, meat or legumes.
Final Thoughts
The gut–muscle axis highlights a simple but powerful idea:
👉 Muscle health depends on more than muscle alone.
Researchers are increasingly recognising the connections between:
-
Gut health
-
Digestion
-
Recovery
-
Protein intake
-
Physical activity
-
Healthy ageing
By focusing on nutrient-dense foods, adequate protein, prebiotic-rich foods, regular movement and consistent daily habits, you create a strong foundation for both gut and muscle health.
Because strength is built not only through training—but through a body that is nourished, resilient and functioning as a whole.