Metabolic Health

Understanding high blood pressure, elevated cholesterol, blood sugar dysregulation, and the role of body composition

You may have been told at different points that your blood pressure is a little high, that your blood sugar is creeping up, that your cholesterol needs watching, or that your weight is becoming a health concern. Each of these conversations probably felt separate: a different number, a different problem, a different thing to worry about.

However, in many cases, they share the same root cause. And once that's understood, the path forward becomes considerably clearer.

This is the first article in a monthly series on Metabolic Health, looking in depth at high blood pressure, elevated cholesterol, blood sugar dysregulation, and the role of body composition. Before diving into each, it's worth stepping back to understand why these conditions so frequently appear together and why addressing that common ground tends to be more effective than tackling each one in isolation.

What Is Metabolic Health?

The word 'metabolic' refers to the processes through which the body converts food into energy, regulates its internal chemistry, and maintains the conditions that organs and tissues need to function. Metabolic health, broadly speaking, means these processes are working well: blood sugar is stable, blood pressure is within a healthy range, cholesterol and blood fat levels are balanced, and body weight is within a range that supports rather than strains the system.

By that definition, poor metabolic health is surprisingly common. Research published in Metabolic Syndrome and Related Disorders estimated that only around 12% of American adults meet all criteria for optimal metabolic health, a figure that has prompted similar scrutiny of UK and European populations (1). Closer to home, estimates consistently suggest that around one in four adults in the UK has some degree of metabolic dysfunction, with prevalence rising sharply with age (2).

What this means in practice is that metabolic health exists on a spectrum. You do not need a formal diagnosis to benefit from change, and the earlier you act, the more you stand to gain. 

What Is Metabolic Syndrome?

Metabolic syndrome is a clinical term for when several metabolic risk factors appear together in the same person. It is diagnosed when at least three of the following five criteria are present:

• Central obesity, measured by waist circumference

• Raised blood pressure

• Elevated fasting blood glucose

• High triglyceride levels

• Low HDL cholesterol (the so-called 'good' cholesterol)

These five components rarely appear in isolation. In clinical practice, most people who meet the diagnostic threshold have four or five of them and the more that are present, the greater the cardiovascular and metabolic risk (3).

Between 2000 and 2023, the prevalence of metabolic syndrome nearly doubled worldwide, rising from around 14.7% to 31% in women, and from 9% to 25.7% in men, affecting an estimated 1.54 billion adults, according to a 2025 systematic review published in Nature Communications (4). Specifically in the UK, around one in four adults currently meets diagnostic criteria (2), with the sharpest rise seen in people aged 30 to 45, suggesting that metabolic dysfunction is beginning earlier in life than previous generations.

Unfortunately, and most likely one of the key reasons the numbers are rising worldwide, metabolic syndrome is largely silent. Raised blood pressure, high triglycerides, and elevated blood sugar can all be present for years without any obvious warning signs. A routine blood test and a waist measurement are often all it takes to find out where you stand.

Why Do These Conditions Cluster Together?

Metabolic syndrome is complex in the sense that it doesn't always stem from the same root cause, or even from a single one. High blood pressure, high blood sugar, cholesterol imbalances, and abdominal weight gain can share a common set of underlying causes that drive all of them simultaneously. Insulin resistance is a key example. 

When the body's cells become less responsive to insulin, the hormone that moves glucose from the bloodstream into cells, the pancreas compensates by producing more of it. Chronically elevated insulin has wide-ranging effects: it promotes fat storage, particularly around the abdomen; it raises blood pressure by increasing sodium retention and activating the stress response system; and it disrupts the balance of fats in the blood, lowering HDL cholesterol and raising triglycerides (5,3). The conditions that make up metabolic syndrome are, in large part, consequences of this single underlying dysfunction.

Chronic low-grade inflammation is the second major thread. Excess visceral fat, the fat stored deep inside the abdominal cavity, around the organs, actively produces inflammatory molecules that impair insulin signalling, damage blood vessel walls, raise blood pressure, and contribute to the arterial plaques that underlie heart disease (6). This is why waist circumference, rather than overall body weight, has become the central diagnostic criterion for metabolic syndrome.

The third thread is the modern dietary and lifestyle environment. Diets high in ultra-processed foods, refined carbohydrates, and added sugars drive both insulin resistance and visceral fat accumulation. Physical inactivity reduces the body's ability to manage blood sugar and maintain vascular health. Poor sleep and chronic stress both elevate cortisol, which raises blood pressure, promotes fat storage around the abdomen, and worsens insulin sensitivity (7). These three threads, insulin resistance, inflammation, and lifestyle, are not independent of one another. They interact and reinforce each other, which is precisely why metabolic conditions so rarely appear alone.

Why This Framing Matters?

When individual risk factors are identified, they are often managed separately, raised blood pressure in one conversation, elevated cholesterol in another, creeping blood sugar in a third. This is understandable, but it misses something important: these conditions frequently share the same underlying drivers, and addressing those drivers tends to improve all of them at once.

This is what the metabolic health framing offers. Rather than treating each condition in isolation, it asks what is causing them in the first place, and the evidence suggests that tackling those causes through diet and lifestyle change can move all of the markers in the right direction simultaneously. A 2025 network meta-analysis of 98 randomised controlled trials, published in PLOS Medicine, found that combining dietary change with physical activity was significantly more effective at reversing metabolic syndrome than either approach alone (9), which makes sense, given that the underlying causes are themselves interconnected (7,8).

This does not mean medication is never appropriate. For people with significantly elevated blood pressure, very high cholesterol, or established type 2 diabetes, pharmacological treatment is often clinically indicated and should be discussed with a GP. What the metabolic health framing offers alongside that is a way of understanding and addressing the conditions driving these presentations in the first place.

In This Metabolic Health Series

Each article in this Metabolic Health monthly series looks at one piece of the metabolic health picture in depth. The aim throughout is to explain what the evidence actually says, translate it into practical terms, and give you something concrete to act on.

• Hypertension, explores why blood pressure rises, what dietary and lifestyle changes the evidence supports most strongly, and what meaningful prevention looks like in practice.

• Cholesterol, Triglycerides, and Heart Health, examines what cholesterol numbers actually mean, how diet influences the balance of LDL and HDL, and where the evidence for dietary intervention is strongest.

• Blood Sugar and Insulin Resistance, traces the spectrum from optimal blood sugar to type 2 diabetes, how the body loses and regains insulin sensitivity, and what dietary patterns the evidence supports most consistently.

• Abdominal Obesity and Metabolic Risk, moves beyond weight as the primary metric to look at visceral fat, body composition, and what these mean for metabolic risk in practice.

The goal of this Metabolic Health monthly series is not to replace clinical care but to complement it, offering evidence-based, preventative guidance rooted in the pillars of lifestyle medicine: nutrition, physical activity, sleep, stress management, social connections, and the avoidance of harmful substances. These are not soft or secondary considerations. They are among the most powerful tools available for shifting metabolic health in a meaningful direction, and the evidence behind them is stronger than is often appreciated. 

If any of what this article describes sounds familiar, whether you have been told your numbers are heading in the wrong direction, or you simply want to understand your health more clearly, I'd love to help. The evidence base for improving metabolic health is strong, and having personalised guidance can make the path considerably more navigable.

If you'd like to work together, you can find out more about how I work and get in touch via the contact page.

Next in the series is Hypertension: what your blood pressure numbers actually mean, why they rise, and what the evidence says you can do to bring them down. Subscribe to receive each of the Metabolic Health monthly series article directly in your email.

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References

1. Araújo J, Cai J, Stevens J. (2019). ‘Prevalence of optimal metabolic health in American adults: National Health and Nutrition Examination Survey 2009-2016’.Metabolic Syndrome and Related Disorders. 17(1), pp.46-52. Available at: https://pubmed.ncbi.nlm.nih.gov/30484738/

2. Diabetes UK (2022). Diabetes statistics. Available at: https://www.diabetes.org.uk/about-us/about-the-charity/our-strategy/statistics

3. Alberti KG, Zimmet P, Shaw J.(2006). ‘Metabolic syndrome- a new worldwide definition: a consensus statement from the International Diabetes Federation’. Diabetic Medicine. 23 (5) pp.469-480. Available at: https://pubmed.ncbi.nlm.nih.gov/16681555/

4. Noubiap JJ, (2025). ‘Worldwide trends in metabolic syndrome from 2000 to 2023: a systematic review and modelling analysis’. Nature Communications. vol.16 pp.1-13. Available at: https://pubmed.ncbi.nlm.nih.gov/41350289/

5. Reaven GM (1988). ‘Banting Lecture 1988: role of insulin resistance in human disease’. Diabetes. Vol. 37(12) pp.1595-1607. Available at:https://pubmed.ncbi.nlm.nih.gov/3056758/

6. Hotamisligil GS. (2006). ‘Inflammation and metabolic disorders’. Nature. 444 (7121) pp.860-867. Available at: https://pubmed.ncbi.nlm.nih.gov/17167474/

7. Park S, Lee J, Seok JW, Park CG, Jun J. Comprehensive lifestyle modification interventions for metabolic syndrome: a systematic review and meta-analysis (2024). Journal of Nursing Scholarship. 56 (2) pp.249-259. Available at: https://pubmed.ncbi.nlm.nih.gov/38009414/

8. Yamaoka K, Tango T. (2012) ‘Effects of lifestyle modification on metabolic syndrome: a systematic review and meta-analysis’. BMC Medicine. 10 (1) pp.138. Available at:https://pubmed.ncbi.nlm.nih.gov/23151238/

9. Pillay J. et al. (2024). ‘Multi-modal interventions outperform nutritional or exercise interventions alone in reversing metabolic syndrome: a systematic review and network meta-analysis’. PLOS Medicine. Available at: https://pubmed.ncbi.nlm.nih.gov/40116109/