At Mosaic Medical, we increasingly see patients who are concerned about their metabolic health. While the term is used frequently in health discussions, many people are unsure what it actually means and why it matters so much for long-term wellbeing.
What is metabolic health?
Metabolic health refers to how well the body regulates and uses energy. It reflects how effectively we manage blood sugar, process fats and cholesterol, regulate blood pressure and maintain healthy insulin sensitivity.
Clinically, metabolic health can be assessed using a number of markers, including:
- Blood pressure
- Blood glucose and HbA1c
- Cholesterol and advanced lipid markers
- Indicators of inflammation
- Body composition and visceral fat levels
Symptoms can also provide important clues. Poor metabolic health is strongly associated with conditions such as type 2 diabetes, fatty liver disease, polycystic ovary syndrome (PCOS), cardiovascular disease and even memory and cognitive problems. Many women also notice that metabolic changes begin to emerge around the time of menopause.
One of the biggest challenges we see at Mosaic Medical is that metabolic dysfunction often develops many years before a formal diagnosis is made. By the time conditions such as diabetes or fatty liver are diagnosed, underlying metabolic disruption has often been present for a long time. This is why early detection and prevention are so important.
A growing metabolic health crisis
Across the UK, metabolic health is becoming a major public health concern. Rising rates of insulin resistance, combined with high consumption of ultra-processed foods, are contributing to increased levels of chronic inflammation and metabolic dysfunction.
Another major issue is our low fibre intake.
In the UK, the average adult consumes around 18 grams of fibre per day, yet the recommended intake is 30 grams daily. This shortfall has important implications for metabolic health.
Why fibre matters for metabolic health
Fibre plays a critical role in regulating metabolism.
One of its key effects is on blood sugar control. Soluble fibre slows the absorption of carbohydrates in the gut. This helps smooth out blood glucose levels after eating, preventing the rapid spikes and crashes that can lead to fatigue, cravings and overeating.
When blood sugar rises quickly, the body releases insulin to bring it back down. Frequent spikes in blood sugar lead to repeated surges in insulin, and over time this can contribute to insulin resistance and weight gain. Elevated insulin levels are strongly linked to obesity and metabolic disease.
Interestingly, even artificial sweeteners can stimulate insulin release. Although they contain little or no sugar, they can signal to the body that glucose may be arriving, which may increase insulin levels in some individuals.
Fibre also helps regulate appetite. When we eat fibre-rich foods, they create a gentle stretching of the stomach that promotes a feeling of fullness. In addition, fibre stimulates the release of GLP-1, a hormone that helps regulate appetite and blood sugar. GLP-1 is the same pathway targeted by medications such as Ozempic and Mounjaro, but importantly, increasing fibre intake can naturally stimulate this system.
Fibre also supports cholesterol balance. Certain fibres bind to bile acids in the digestive tract, increasing their excretion and encouraging the body to use cholesterol to produce more bile acids. This can help reduce circulating cholesterol levels.
Finally, fibre supports the gut microbiome, and this is where its metabolic benefits become even more powerful.
Prebiotics: feeding the beneficial bacteria
Not all fibres are the same. Some fibres are known as prebiotics.
Prebiotics are specific types of fibre that feed beneficial gut bacteria, helping them grow and thrive. Important microbes supported by prebiotic fibres include:
- Bifidobacteria
- Lactobacillus
- Akkermansia muciniphila
Akkermansia muciniphila is particularly interesting. This bacterium helps maintain the protective mucin layer of the gut lining. Lower levels of Akkermansia have been associated with obesity and metabolic dysfunction, suggesting it plays a protective role in metabolic health.
By consuming prebiotic fibres, we provide the nutrients these beneficial microbes need to flourish.
Prebiotics vs probiotics
There is a great deal of attention in the media on probiotics, which are supplements containing live bacteria. While probiotics can be helpful in certain situations, they tend to be transitory — they remain in the gut only while they are being consumed.
Prebiotics, on the other hand, feed the beneficial bacteria that are already present in the gut, encouraging them to multiply and strengthen the microbiome over time. When prebiotics come from whole foods, they can have a profound impact on gut ecology and metabolic health.
A healthier microbiome can lead to:
- Increased microbial diversity
- Improved insulin sensitivity
- Reduced inflammation
- Better appetite regulation
- Stronger gut barrier function
- Reduced visceral fat
Visceral fat — the fat stored around the organs — is a major driver of metabolic disease, so reducing it can significantly improve long-term health outcomes.
Where to find prebiotic fibres
Many of the best sources of prebiotic fibres come from plant foods that are sometimes considered harder to digest. These include:
- Asparagus
- Leeks
- Chicory root
- Garlic
- Onions
- Beans and lentils
Prebiotic fibres are also present in resistant starch, a type of carbohydrate that resists digestion in the small intestine and instead feeds gut bacteria in the colon. Good sources include:
- Cooled potatoes
- Slightly under-ripe green bananas
- Oats
- Apples (particularly with the skin)
- Whole citrus fruits (rather than juice)
Increasing fibre intake safely
If we could encourage one dietary change for the year ahead, it would be increasing fibre intake.
Improving fibre consumption can support metabolic health, help regulate appetite and weight, and may reduce the risk of future conditions such as diabetes, PCOS, stroke, cardiovascular disease and even colon cancer.
However, it is important to increase fibre gradually. A sudden large increase in fibre can cause bloating and abdominal discomfort as the gut microbiome adjusts.
For individuals with digestive conditions such as irritable bowel syndrome (IBS), small intestinal bacterial overgrowth (SIBO) or inflammatory bowel disease, fibre intake may need to be adjusted in a more personalised way.
Tracking your fibre intake
Many people are surprised when they begin to track their fibre intake and realise how far below the recommended level they are. Apps such as NutriCheck can be helpful for monitoring daily intake and ensuring that meals contain enough fibre-rich foods.
The year of fibre
In some ways, 2025 became the year of protein in nutrition discussions. As we move forward, we believe 2026 should be the year of fibre.
By increasing fibre intake — particularly from diverse plant foods rich in prebiotics — we can support our gut microbiome, improve metabolic health and help protect ourselves from many of the chronic diseases that are becoming increasingly common in modern life.