Weight Loss? Conception? Menopause? We still start with the gut

One of the questions I sometimes hear is: "My main issue isn't digestive, so why are we talking about gut health?" It's a fair question.

Many people come to me not because of issues like IBS or SIBO, but because they are struggling with fertility, weight loss, menopausal symptoms, fatigue, or autoimmune conditions. At first glance, these concerns seem quite removed from gut health. Yet digestive health is often one of the areas I explore early on.

One reason is simple. Every cell, tissue, hormone, neurotransmitter, and repair process within the body relies on nutrients that must be digested, absorbed, and transported to where they are needed.

Beyond this, the gut and microbiome influence many of the systems involved in how we feel and function, including hormone regulation, immune function, inflammation, energy production, and metabolism. Its close relationship with the nervous system makes it even more relevant when addressing complex health issues. 

We often think of fertility, hormones, metabolism, energy, immunity, and mood as separate concerns. But the body doesn't work that way. Everything is connected, and the gut is one of the clearest places where many of the body's most important systems intersect.

As a result, it is very common for people experiencing health challenges to also have digestive symptoms, microbiome imbalances, or other signs of dysfunction, even when these have never been explored or considered relevant. 

When I look at gut health, I'm looking for clues about what's happening more broadly within the body, as well as signs of dysfunction. 

Weight loss resistance and metabolic health

Weight management is rarely just about willpower. Nor is it usually just about calories. For a lot of people, weight gain or difficulty losing weight is one of the first signs that something deeper within the body is out of balance.

Blood sugar regulation, hormone balance, inflammation, digestive health, stress, and nutrient status can all influence how the body maintains weight. When these systems are functioning well, the body is often far more capable of regulating weight than when they are under strain. 

Digestive health impacts how we absorb nutrients, regulate appetite, process food, and maintain metabolic health. For some people, addressing digestive health is not simply supportive of weight loss but central to addressing some of the underlying factors that have contributed to weight gain in the first place.

Modern approaches to weight loss have moved beyond dieting, calorie counting, restriction, and willpower, placing greater emphasis on behaviour change, habits, identity, mindset, and consistency. These factors matter and can play an important role in long-term success. However, in focusing on behaviour, it is easy to overlook biology. Digestive health, blood sugar regulation, inflammation, nutrient status, hormones, and the microbiome can all affect appetite, cravings, energy levels, and metabolic function.

Understanding these foundations can provide important context for why weight management feels relatively straightforward for some and persistently difficult for others.

Fertility and conception

When someone is trying to conceive, attention naturally turns towards reproductive hormones. While hormones are undoubtedly important, the health of the gut and the body's nutritional status help create the environment in which conception occurs.

Before the body can build hormones, support healthy egg quality, or prepare for pregnancy, it requires the raw materials found in the food we eat. Our ability to digest, absorb, and utilise those nutrients effectively is essential. However, the relationship between gut health and fertility extends beyond digestion and nutrient absorption.

The microbiome influences hormone regulation, metabolism, signalling, and communication throughout the body. Increasingly, research is showing that the gut and reproductive systems are closely connected, interacting in ways we are only beginning to fully understand. 

If you're seeking support with fertility, it’s important to have an approach that does not focus exclusively on hormones. Fertility is affected by far more than the reproductive system alone, and the quality of the environment in which conception occurs matters just as much as the hormones themselves.

Perimenopause and hormonal change

For some, entering perimenopause can feel unfamiliar. Sleep often changes. Anxiety may increase. Weight can become harder to manage. Energy becomes less stable.

As hormones shift, systems involved in digestion, metabolism, immune function, and stress resilience are all required to adapt. When digestive health has already been under strain, this transition can sometimes feel more challenging.

This is one of the reasons I look to the gut when supporting women through perimenopause. Assessing gut health can help identify underlying imbalances while also providing insight into the broader aspects of health.

Understanding what is happening more broadly within the body can help explain why some women navigate this stage relatively smoothly, while others find it much more challenging.

And if menopause still feels a long way off, don't assume this conversation can wait until later. The foundations you build today can have a significant impact on how you experience that transition in the years to come.

Other areas where gut health matters 

Autoimmune conditions 

Autoimmune conditions are complex, and the gut plays a central role in immune regulation and communication throughout the body. There is growing evidence that microbiome health and gut permeability may influence the development and expression of autoimmune conditions. 

Fatigue and burnout

Fatigue and burnout are rarely caused by a single factor. Sleep, stress, nutrient status, inflammation, digestive health, and nervous system regulation can all impact how much energy we have available and how resilient we feel. 

Stress and anxiety

While stress can influence digestion, the gut and microbiome can, in turn, affect mood, resilience, anxiety, and how we respond to life's challenges. Understanding what is happening within the digestive system can provide valuable clues about emotional and psychological health.

Understanding the bigger picture

The gut is not simply an organ or group of organs. It sits at the crossroads of many of the body's systems, including the immune system, nervous system, and hormonal network.

It's become clear that many of the symptoms people experience cannot be fully understood by looking at a single system in isolation. Assessing gut health early on helps us understand an important part of that wider picture.

This doesn't mean every health problem starts in the gut. Rather, as one of the body's primary interfaces with the outside world and a major hub of communication throughout the body, it is one of the most useful places to begin asking questions.

As our understanding of the microbiome, the vagus nerve, the gut-brain axis, and the full role of the gut continues to grow, so too does our appreciation of its influence on human health.

Long before we coined these terms, people spoke about "gut feelings", trusting their gut, or feeling something in the pit of their stomach. We still use these expressions today because many of us intuitively recognise that the gut plays a role in far more than just digestion.

Perhaps this intuition recognised something science is now helping us understand more clearly: the gut is deeply connected to how we experience health, well-being, and life itself.

What you can take from this

The gut is not the answer to everything. But whether the issue is fertility, weight loss, hormones, fatigue, autoimmunity, or stress, it remains one of the most valuable windows into the body.

Working with a Nutritional Therapist who understands the relationship between digestion, the microbiome, nutrition, and overall health can help you explore some of the factors contributing to what you're experiencing. In many cases, this provides valuable insights that might otherwise be missed.

References

Cryan, J.F. et al. (2023). The microbiota-gut-brain axis. Nature Reviews Gastroenterology & Hepatology.

Moloney, R.D. et al. (2016). Stress and the microbiota-gut-brain axis in visceral pain: relevance to irritable bowel syndrome. Biological Psychiatry.

Zeevi, D. et al. (2015). Personalised nutrition by prediction of glycemic responses. Cell.

La Torre, D. et al. (2023). Psychological stress and intestinal barrier function: mechanisms linking stress and gut permeability. Frontiers in Nutrition.

Marco, M.L. et al. (2026). The International Scientific Association for Probiotics and Prebiotics (ISAPP) consensus statement on the definition and scope of gut health. Nature Reviews Gastroenterology & Hepatology.