Weight-loss drugs are reshaping how we think about appetite, health and what it means to eat well. These medications, often hailed as breakthroughs, are changing lives and offering new hope in the face of chronic disease. But as the focus shifts towards eating less, is a fundamental question being overlooked? Here, Dr Lucy Williamson — award-winning public health nutritionist, author and former vet — draws on 30 years’ experience across soil, livestock, food and human health to explore what’s being left out of the conversation.

The rapid rise of weight-loss drugs has sparked a global conversation about appetite, health and how we eat. For many, these medications are life-changing, supporting weight loss and improving metabolic health, in particular, type 2 diabetes and heart disease. Where other approaches have fallen short, they are offering new hope and the potential for longer, healthier lives. That matters.

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But as this conversation gathers pace, it risks narrowing our focus. Much of the attention is on eating less – on appetite suppression, portion control and reduced intake. While this is part of the picture, it leaves a more fundamental question largely unasked: what is the quality of the food we are eating, and where does it come from?

At the centre of this discussion is GLP-1, a hormone naturally produced in the gut. It helps regulate appetite by slowing digestion, balancing blood sugar and signalling fullness. The latest medications work by mimicking or enhancing this process. But if the focus remains solely on suppressing appetite, without improving food quality, we risk overlooking the very systems that support health in the first place: our biology, our vital gut microbiome, our food and the soils that grow it.

Appetite, food and the gut

Appetite is not simply a matter of willpower, but a biological process shaped by signals between the gut, brain and metabolism, and influenced by our environment. At the heart of this system lies the gut microbiome, the vast community of microbes living in our large intestine; it supports our wider health, protecting it from immunity and inflammation, against allergy, overweight and obesity, cholesterol imbalance, cognitive decline and even cancer.

A healthy gut microbiome depends on a diverse diet rich in plant fibres and ‘bioactive’ compounds like antioxidants. UPFs in which nutrients have been displaced by high energy sugars and fats, reduce this diversity, weakening its protective role in overall health, including its influence on appetite. Food itself is more than nutrients – it should be a multi-sensory experience – a complex ‘matrix’ of structure and chemistry that determines how quickly its nutrients are absorbed, how full we feel and how long that fullness lasts. When this matrix is disrupted by processing or lower nutrient density, our biology no longer recognises this ‘food’ and our finely tuned appetite system just doesn’t work for us.

The gut microbiome and GLP-1

Our gut microbes are constantly producing probiotics for us – healthful compounds that work closely with our biology, for example stimulating cells in our gut wall to produce GLP-1, directly contributing to feelings of fullness. Prebiotics in our diet (types of fibre) further support this process by encouraging certain microbes to increase GLP-1 production. There is also emerging evidence linking our natural production of GLP-1 with higher levels of butyrate-producing gut microbes. Butyrate is our natural anti-inflammatory compound.

In this way, beneficial gut microbes help regulate appetite by enhancing GLP-1 signalling. In contrast, diets high in processed foods can reduce microbial diversity and weaken these mechanisms. Appetite, then, is not just about how much we eat, but what we eat, and how that food interacts with our internal ecosystem.

Inflammation: the root of chronic disease

Many of the chronic health conditions of our time – obesity and metabolic illness, allergies, cancers and digestive disorders, share a common root – inflammation. While inflammation is designed to be short-lived and protective, it is now often persistent. The gut microbiome is deeply involved in regulating this process.

The goal, therefore, is not simply to override appetite, but to restore the body’s natural ability to regulate it and in doing so protect our long-term health. To do that, we need to look beyond the plate.

Soil: where the story begins

To fully understand the connection between food and health, we must look to the soil in which our food is grown. The “soil to gut” connection is largely invisible, yet fundamental to the quality of our food and, ultimately, our health.

Healthy soil is a living ecosystem, rich in microbes, fungi and organic matter. These organisms support plant health and influence the nutrient content of crops and pastures being grazed for meat and milk. When soil is healthy, plants are more resilient and better nourished. In turn, foods grown in these systems can provide a richer array of nutrients and compounds that support our gut microbiome.

Antioxidants such as polyphenols and carotenoids, linked to reduced inflammation and improved heart and metabolic health, are often found in higher levels in crops grown in healthier soils. This emerging research shows a trend that organic produce often contains significantly higher levels of certain polyphenols, including flavanols and anthocyanins. Vitamins such as C, E and A are also often higher in food farmed in harmony with nature, reflecting the ability of microbe-rich soils to unlock nutrients for plants.

In contrast, the use of agrochemicals has been linked to poorer gut microbial health. Exposure to pesticides is linked with inflammatory changes in the small intestine, shifts in the gut microbiome and disruption to the gut’s mucous layer, an essential barrier that helps protect against inflammation.

It’s not only food that shapes our microbiome. Increasing evidence suggests our environment plays a role. Time spent in nature, such as gardens, green spaces or farmland, has been linked to greater microbial diversity. Contact with soil and plants exposes us to a wider range of microbes, helping to build a more resilient internal ecosystem. We don’t just eat to support our microbes; we live among them.

There’s still much to understand about these complex ecosystems, with soil health shaping the gut microbiome and, ultimately, human health, via food. Our microbiome is not separate from the wider ecosystem and in many ways, it is an extension of it.

Reconnecting the system

All of this brings us back to appetite and weight. Reducing overconsumption, particularly of ultra-processed foods, will undoubtedly benefit health. For some, weight-loss drugs are an important and necessary intervention.

But eating less of a poor-quality diet is not a long-term solution. If we focus only on suppression, reducing intake without improving food quality, we risk overlooking the systems that sustain our health.

The goal is not simply to control appetite, but to support it. That means looking beyond the individual to the wider system, from the food we eat to the soil it grows in.

Food produced from healthier soils, within farming systems that prioritise diversity and ecological balance, has the potential to better support the gut microbiome and the biological processes that regulate appetite and our metabolism. This is not a quick fix, but a shift in perspective.

It moves us away from seeing health as something to control, and towards understanding it as something to cultivate. Human health does not exist in isolation. It’s shaped by the health of our soils, our food systems and the environments we are part of.

If we want to improve public health, we need to look beyond the plate and reconnect the system from soil to gut.

Register to pre-order Lucy’s upcoming book, Soil to Gut: https://mailchi.mp/cfb2bb5b34ac/soiltogut

Connect with Lucy: https://lwnutrition.co.uk/