What Actually Helps Improve Gut Health?

Bloating. Irregular bowel habits. Discomfort after meals. Low energy. Ongoing digestive discomfort is often your body signalling that your gut needs support.

Your gut is more than just a system that digests the food you consume. It’s home to trillions of bacteria — known as the gut microbiome — that influence how you absorb nutrients, regulate inflammation, and even support immune function. In fact, a large portion of your immune system is closely connected to your digestive tract. Research suggests that approximately 70–80% of immune cells are located within the gut, where they interact constantly with the intestinal microbiota (your gut bacteria), the intestinal epithelial lining, and the local mucosal immune system. 

When your gut is balanced and functioning well, your body is better equipped to absorb nutrients, maintain regular digestion, and respond to everyday stressors. But when that balance is disrupted — due to stress, poor diet, illness, antibiotics or lifestyle factors — symptoms can start to show, and affect your .

So, what helps improve gut health? We’ll explore how probiotics, fibre, protein and collagen help support your digestive system and share practical tips on how you can do so in a sustainable way.

What is gut health, really?

When people talk about “gut health”, they’re usually referring to how well the digestive system is functioning — but it goes much deeper than that.

Your gut is your gastrointestinal system, which includes the stomach, small intestine, large intestine and colon. Its primary role is to digest food, absorb nutrients, and eliminate waste. 

While there isn’t one single clinical definition of “gut health,” it is generally understood to involve having a balanced and diverse gut microbiome alongside minimal digestive symptoms. A healthy gut supports nutrient absorption, regular bowel movements, immune function, mental wellness, and overall wellbeing.

Gut health involves three main components working together:

1. The gut microbiome

Trillions of microorganisms — including bacteria, viruses and fungi — live primarily in your large intestine. Together, they form what’s known as the gut microbiome.

There are more than 1,000 different species of microbes in the gut. Some can contribute to disease, but many are beneficial and necessary for good health. These microbes help break down certain fibres and nutrients that your body cannot digest on its own, turning them into compounds your body can use.

Gut health is largely about balance — having enough beneficial bacteria to keep potentially harmful microbes in check.

2. The gut lining (intestinal barrier)

The inside of your intestine is lined with a thin layer of cells that acts as a protective barrier. This lining allows nutrients to pass into the bloodstream while preventing unwanted substances — such as toxins or harmful bacteria — from entering circulation.

When the gut lining is functioning well:

• Nutrients are absorbed efficiently
  
• Inflammation is regulated
  
• The immune system responds appropriately

If the barrier becomes compromised, it may contribute to digestive discomfort and increased immune activation.

3. Digestion & nutrient absorption

Gut health also includes how effectively your body:

• Breaks down food
  
• Produces digestive enzymes
  
• Absorbs vitamins and minerals
  
• Moves waste through the intestines

Even if you’re eating a nutritious diet, poor gut function can limit how much your body actually absorbs.

What disrupts gut health?

Several factors can affect gut balance and digestive function. When these disruptions persist, they may contribute to changes in the gut microbiome — sometimes referred to as dysbiosis, which describes an imbalance between beneficial and harmful bacteria in the gut.

Several factors can affect gut balance and digestive function, including:

• High stress levels
  
• Poor sleep
  
• Highly processed diets
  
• Low fibre intake
  
• Excess alcohol
  
• Antibiotic use
  
• Illness or infection

Supporting gut health isn’t about one single supplement or quick fix. It’s about creating the right environment for your microbiome, protecting your gut lining, and supporting efficient digestion.

Here are the key elements that contribute to a healthier gut.

1. A diverse, fibre-rich diet

Fibre is one of the most important nutrients for gut health — not because your body digests it, but because it doesn’t.

Unlike protein, fats and carbohydrates, fibre passes through the small intestine largely undigested. This is key to how it supports the gut. Here’s how it works:

It feeds beneficial gut bacteria

When fibre reaches the large intestine, it becomes fuel for your gut bacteria. Beneficial microbes ferment certain types of fibre and convert them into compounds called short-chain fatty acids (SCFAs) — including butyrate, acetate and propionate.

These SCFAs play several important roles:

• Butyrate serves as a primary energy source for the cells lining the colon.
  
• SCFAs help maintain the integrity of the gut lining.
  
• They help regulate inflammation in the digestive tract.
  
• They influence immune signalling within the gut.

It supports the gut barrier

The intestinal lining acts as a selective barrier, allowing nutrients through while keeping harmful substances out.

Short-chain fatty acids produced from fibre fermentation help support the tight junctions between intestinal cells. These tight junctions act like seals between cells. When functioning properly, they maintain a strong barrier and reduce unnecessary immune activation.

It improves bowel regularity

There are two main types of fibre:

Soluble fibre

• Dissolves in water and forms a gel-like substance
  
• Slows digestion slightly
  
• Helps regulate blood sugar
  
• Feeds beneficial bacteria

Insoluble fibre

• Adds bulk to stool
  
• Helps move waste through the intestines
  
• Reduces constipation

Together, they improve stool consistency and support healthy bowel movements.

It encourages microbiome diversity

Different bacteria prefer different types of fibre. By eating a wide range of plant foods, you provide fuel for a wider variety of microbes.

So, this is why you need to aim for a variety of:

• Vegetables
  
• Fruits
  
• Whole grains
  
• Legumes
  
• Nuts and seeds

2. Probiotics (beneficial bacteria)

Probiotics are live microorganisms that, when consumed in adequate amounts, can help support the balance of bacteria in your gut. They are most commonly bacteria from groups such as Lactobacillus and Bifidobacterium, though some yeasts (like Saccharomyces boulardii) are also used.

Potential benefits

Depending on the strain, probiotics may support:

• Digestive regularity
  
• Reduction in bloating or mild digestive discomfort
  
• Immune system support
  
• Reduced risk of antibiotic-associated diarrhoea

However, benefits are strain-specific — meaning different probiotics serve different purposes.

Read related article: Choosing the Right Probiotic: The Benefits of Different Strains for Your Health

Probiotics can be obtained from both fermented foods and supplements.

Food sources include:

• Yoghurt with live cultures
  
• Kefir
  
• Sauerkraut
  
• Kimchi
  
• Miso
  
• Kombucha

Fermented foods contribute beneficial bacteria and may support microbiome diversity as part of a balanced diet.

Supplement forms include:

• Capsules
  
• Tablets
  
• Powders
  
• Sachets
  
• Liquids

Supplements often provide higher, more concentrated doses of specific strains. They may be useful in situations such as post-antibiotic recovery or when targeting particular digestive concerns.

3. Prebiotics (fuel for good bacteria)

Prebiotics are types of non-digestible fibre that act as food for beneficial gut bacteria. Unlike probiotics — which are live bacteria — prebiotics are the compounds that help those bacteria grow and thrive.

In simple terms: Probiotics add beneficial bacteria. Prebiotics feed them.

Common types of prebiotics

Some of the most studied prebiotic fibres include:

• Inulin
  
• Fructooligosaccharides (FOS)
  
• Galactooligosaccharides (GOS)
  
• Resistant starch

These fibres selectively stimulate the growth of beneficial bacteria such as Bifidobacteria and Lactobacilli.

Natural food sources of prebiotics

Prebiotics are naturally found in many plant foods, including:

• Garlic
  
• Onions
  
• Leeks
  
• Asparagus
  
• Bananas (especially slightly green bananas)
  
• Oats
  
• Legumes

4. Adequate protein intake

Protein plays a crucial role in maintaining gut health — but the key word here is adequate.

The cells lining your intestine (called enterocytes) have one of the fastest turnover rates in the body. They are constantly renewing and repairing themselves. To do this effectively, the body relies on amino acids — the building blocks of protein.

Without sufficient protein intake, the body may struggle to maintain and repair the intestinal lining, which is essential for nutrient absorption and barrier integrity.

How protein supports the gut

Supports the gut lining

Certain amino acids, particularly glutamine, serve as an important energy source for intestinal cells. Glutamine helps:

• Maintain the integrity of the intestinal barrier
  
• Support tight junction function between gut cells
  
• Regulate local immune responses in the gut

Influences the gut microbiome

Protein doesn’t just support structural repair — it also affects the gut microbiota.

A systematic review examining the effects of dietary protein on gut microbiota found that several factors influence how protein interacts with the digestive system, including:

• Protein source (animal vs plant)
  
• Protein quantity
  
• Overall diet composition (including fibre and carbohydrate intake)
  
• Processing methods
  
• Digestibility and bioavailability

Most protein digestion occurs in the stomach and small intestine. However, when protein is not fully digested — particularly in higher amounts — it can reach the large intestine, where gut bacteria ferment it.

This fermentation produces metabolites that may have either beneficial or less favourable effects depending on the type and quantity of protein consumed.

Essentially, the research suggests:

• Some plant proteins (such as soy) may promote beneficial bacteria like Lactobacillus and Bifidobacterium.
  
• Certain animal proteins, when consumed at recommended levels, may also support microbial balance due to higher digestibility.
  
• Protein quality and processing methods can influence how it affects gut bacteria.

5. Collagen and connective tissue support

Collagen is a structural protein that plays a key role in maintaining connective tissue throughout the body — including the gut lining.

The intestinal wall relies on strong connective tissue to maintain its structure and barrier function. Collagen contains amino acids such as glycine, proline and hydroxyproline, which are important for supporting tissue integrity and repair.

While research on collagen specifically for gut health is still evolving, its role in connective tissue maintenance makes it relevant to overall intestinal structure.

What types of collagen may be relevant?

There are several types of collagen in the body, but the most relevant for gut and connective tissue health include:

• Type I collagen – Found in skin, tendons and connective tissue; provides structural strength.
  
• Type III collagen – Commonly found alongside Type I and present in the intestinal wall and other organs.
  
• Type IV collagen – Plays a role in the basement membrane, which helps support epithelial (lining) cells in tissues such as the gut.

Most collagen supplements (such as hydrolysed collagen or collagen peptides) primarily contain Type I and Type III collagen.

Hydrolysed collagen has been broken down into smaller peptides, making it easier to digest and absorb. Once absorbed, the body uses the amino acids as needed for collagen production and tissue repair.

Read related article: Why Collagen is Good for You: Benefits & Ways to Supplement

6. Hydration

Water supports digestion by:

• Helping move food through the intestines
  
• Supporting stool consistency
  
• Assisting nutrient absorption

Dehydration can contribute to constipation and sluggish digestion.

7. Managing stress

The gut and brain are closely connected through the gut–brain axis. Chronic stress can alter gut motility and microbiome balance.

Supporting stress management — through sleep, movement and relaxation — can positively influence digestive health.

8. Limiting highly processed foods & excess alcohol

Diets high in refined sugars and heavily processed ingredients may negatively impact microbiome diversity for several reasons.

Highly refined foods are often low in fibre — which means beneficial gut bacteria receive less fuel. When fibre intake drops, bacteria that rely on fermentable fibres may decline, reducing overall microbial diversity. At the same time, diets high in added sugars can encourage the growth of less favourable bacteria, potentially shifting the balance of the microbiome.

Processed foods may also contain additives, emulsifiers and artificial sweeteners that, in some research, have been shown to alter gut bacterial composition or influence the intestinal barrier in animal models. While human research is still developing, consistent intake of highly processed foods is generally associated with lower microbial diversity.

Alcohol can also affect gut health when consumed in excess.

Regular high alcohol intake may:

• Irritate the intestinal lining
  
• Increase intestinal permeability
  
• Alter the balance of gut bacteria
  
• Promote inflammatory responses

Alcohol is metabolised in the liver, but it first passes through the digestive tract, where it can directly affect gut cells and bacteria. Over time, excessive intake may contribute to changes in microbial composition and compromise gut barrier integrity.

Conclusion: Supporting your gut is about balance

Gut health isn’t built from a single supplement or a short-term fix. It’s shaped by consistent daily habits — what you eat, how you manage stress, how well you sleep, and whether your body is receiving the nutrients it needs to maintain balance.

A healthy gut relies on:

• A diverse, fibre-rich diet to feed beneficial bacteria
• Probiotics and prebiotics to support microbiome balance
  
• Adequate protein to help maintain and repair the gut lining
  
• Collagen and key amino acids to support connective tissue integrity
  
• Limiting excess processed foods and alcohol
  

Each of these elements works together. When your microbiome is supported, your gut lining is maintained, and digestion functions efficiently, your body is better positioned to absorb nutrients and regulate immune responses effectively.

If you’re looking to strengthen your routine, nutritional support can play a practical role. In some cases — particularly if you have dietary restrictions, digestive sensitivities, recent antibiotic use, or limited whole-food intake — supplementing with a quality probiotic may help support microbial balance.

Australian NaturalCare - Probiotic 32 Billion (30 Capsules)

ANC Probiotic 32 Billion contains a blend of beneficial Lactobacillus and Bifidobacterium strains to help support digestive balance and immune function. Providing 32 billion live cultures per dose, it offers a convenient way to help maintain gut microbiome diversity when dietary intake alone may not be sufficient.

Shop the ANC Probiotic 32 Billion at Aussie Pharma Direct.

And if you’re looking to further support your gut through adequate protein, collagen and prebiotic fibre intake, we also stock a range of Chief Nutrition products that can contribute to gut health in multiple ways — including probiotics, prebiotic fibre, collagen and quality protein sources.

Shop the Chief Nutrition range to support your gut health