Many people with stubborn weight gain, strong cravings, or rebound weight regain have disrupted gut signalling. The hormones that regulate appetite, satiety, and metabolic balance are not functioning optimally, even when lifestyle efforts are in place.

Two key hormones sit at the centre of this conversation: GLP-1 and GLP-2.

They are not fat-burners or appetite suppressants in the traditional sense.

They are gut-derived regulators of appetite, metabolism, and gut integrity — and they are strongly influenced by the microbiome.

 

What Are GLP Hormones?

 

GLP stands for Glucagon-Like Peptide.

Both GLP-1 and GLP-2 are released from specialised cells (called L-cells) in the small intestine and colon after eating, particularly in response to fibre, dietary fat, and microbial fermentation.

These hormones form part of the gut–brain–metabolism axis, influencing:

 

• Appetite and fullness
• Blood sugar regulation
• Insulin sensitivity
• Gut barrier health

 

Despite their similar names, GLP-1 and GLP-2 have very different roles.

 

GLP-1: The Satiety and Metabolic Hormone

 

GLP-1 plays a central role in appetite regulation and weight control.

Its primary functions include:

 

• Signalling fullness to the brain
• Slowing gastric emptying so meals keep you full longer
• Increasing insulin release in a glucose-dependent way
• Reducing post-meal blood sugar spikes
• Improving overall insulin sensitivity

 

This is why pharmaceutical weight-loss medications target GLP-1 receptors — they amplify a hormone your body already produces.

However, GLP-1 is not just drug-driven.

Your body naturally releases GLP-1, and its production is closely linked to gut health.

When GLP-1 signalling is impaired, people often experience:

 

• Persistent hunger despite eating enough
• Strong cravings, especially for carbohydrates
• Difficulty feeling satisfied after meals
• Blood sugar instability
• Weight regain despite calorie control

 

GLP-2: The Gut Barrier and Repair Hormone

 

GLP-2 does not directly suppress appetite, but it plays a critical supporting role in sustainable weight loss.

Its primary functions include:

 

• Strengthening the intestinal lining
• Reducing intestinal permeability
• Supporting gut repair and resilience
• Improving nutrient sensing and absorption

 

Why does this matter for weight loss?

Because an inflamed or compromised gut barrier interferes with hormonal signalling. When gut inflammation is present, appetite hormones such as GLP-1 often become blunted or dysregulated.

This can contribute to:

 

• Poor appetite control
• Increased cravings
• Insulin resistance
• Low-grade inflammation that promotes weight gain

 

In simple terms, you cannot regulate appetite properly from an inflamed gut.

 

Why GLP-1 and GLP-2 Work Together

 

GLP-1 and GLP-2 are released together from the same intestinal cells.

When gut health improves, both hormones often improve simultaneously.

Supporting the gut environment can:

 

• Improve satiety signalling
• Stabilise blood sugar
• Strengthen the gut barrier
• Reduce inflammatory interference with metabolism

 

This explains why gut-focused approaches to weight loss tend to feel more balanced and sustainable than aggressive appetite suppression alone.

 

The Microbiome’s Role in GLP Signalling

 

The gut microbiome plays a significant role in regulating GLP release.

Certain microbes are associated with healthier appetite and metabolic signalling, including:

 

• Akkermansia muciniphila, linked to improved insulin sensitivity and metabolic health
• Butyrate-producing bacteria, which stimulate GLP-1 and GLP-2 release
• Bifidobacterium species, which support gut barrier integrity and reduce inflammation

 

These microbes do not force weight loss.

Instead, they help restore normal appetite physiology.

This distinction is important — sustainable weight loss is about normalisation, not suppression.

 

Weight Loss Is Not About Eliminating Insulin or Speeding Up the Gut

 

A common misconception is that weight loss requires minimising insulin or speeding digestion for detoxification.

In reality, effective weight regulation depends on:

 

• Insulin sensitivity, not insulin avoidance
• Stable blood sugar, not rapid glucose swings
• Efficient digestion, not rushed transit
• Proper liver and bile function, not laxative-driven clearance

 

GLP-1 improves insulin efficiency by reducing glucose spikes, meaning the body often needs less insulin overall, not more.

Slowing gastric emptying in a physiological way helps:

 

• Maintain fullness between meals
• Reduce snacking and grazing
• Improve metabolic stability

 

Rapid gut transit, on the other hand, often worsens cravings, nutrient deficiencies, and metabolic stress.

 

Why Gut Health Is Often the Missing Link in Weight Loss

 

If weight loss has been difficult despite calorie control, exercise, or fasting, the issue is often biological signalling rather than effort.

Common underlying drivers include:

 

• Gut inflammation
• Reduced microbial diversity
• Impaired fermentation of fibre
• Blunted GLP-1 response
• Blood sugar dysregulation

 

Addressing these restores the body’s ability to self-regulate appetite and energy intake.

 

The Bottom Line

 

GLP-1 helps regulate appetite, satiety, and blood sugar.

GLP-2 supports gut barrier integrity and repair.

Both hormones are influenced by the gut microbiome.

Supporting gut health allows appetite and metabolism to work with the body rather than against it — which is the foundation of sustainable weight loss.

If appetite feels dysregulated or weight loss has stalled, supporting natural GLP-1 signalling can make the process feel calmer and more sustainable. A personalised approach helps identify what your body needs to restore balance. Book with our naturopath to learn more and uncover the underlying cause of your weight issue.