When I work with patients, one of the first things I look at is their metabolic health. That’s because it sits at the centre of so many conditions – from diabetes and heart disease, to fatigue, brain fog, and stubborn weight gain.
Metabolic health is essentially the body’s ability to process and use energy efficiently.
When this system is balanced, your cells get the fuel they need, inflammation stays low, and you feel and function at your best.
When it’s out of balance, the body begins to send signals – sometimes subtle at first, like low afternoon energy or difficulty losing weight, and sometimes more obvious, like rising blood sugar or high blood pressure.
Understanding metabolic health gives us a clearer picture of what’s really driving symptoms and risks, and more importantly, it shows us where we can intervene to change the trajectory of your health.
What is metabolic health?
Metabolic health isn’t just one number on a lab test – it’s a collection of measures that reflect how well your body is running its core systems. In functional medicine, we pay close attention to:
- Blood sugar regulation: how your body manages glucose after meals and over time
- Blood pressure: a marker of cardiovascular strain and vessel health
- Blood fats (cholesterol and triglycerides): indicators of how well you’re transporting and storing energy
- Body composition, including fat mass and muscle mass, and how it is distributed across the body: extra abdominal fat is closely linked to insulin resistance and higher disease risk
When these markers are in a healthy range, it tells us your metabolism is flexible, resilient, and working optimally. When they start to shift out of range, it’s often the first sign of deeper imbalances – well before a diagnosis is made.
Why metabolic health matters
We often think of health risks as something that happens “down the track” – heart disease, diabetes, dementia. But poor metabolic health affects you long before those diagnoses appear.
When your metabolism isn’t working as it should, you might notice:
- Low or fluctuating energy: feeling wired after meals, or crashing mid-afternoon
- Brain fog: difficulty focusing or staying sharp
- Weight changes: especially around the middle, despite no big shifts in eating or activity
- Sleep issues: trouble falling or staying asleep, or waking unrefreshed
- Mood shifts: irritability, anxiety, or low mood linked to blood sugar swings
These are the body’s early warning signs. Left unchecked, they often progress into more complex conditions – insulin resistance, high blood pressure, fatty liver, type 2 diabetes, or cardiovascular disease.
But here’s the encouraging part: metabolic health is dynamic. It responds to your daily choices around food, movement, sleep, and stress. By tracking and improving key markers, we can often reduce symptoms, lower risk, and restore vitality long before disease takes hold.
How to assess metabolic health
When I’m assessing a patient’s metabolic health, I don’t look at one number in isolation.
Instead, I combine everyday measures with key lab tests to get a full picture of how their system is working. You can think of these as “vital signs” for your metabolism.
Everyday measures
These are simple checks that give us important clues:
- Waist circumference: Carrying more weight around the middle (visceral fat) is strongly linked with insulin resistance and cardiovascular risk
- Blood pressure: Readily measured at home or at the pharmacy. Consistently high readings suggest your cardiovascular system is under strain
- Weight trends: Not about the number on the scale alone, but whether it’s steadily rising, falling, or stable
Core lab tests
Your GP can order these as part of a standard check-up:
- Fasting glucose: How much sugar is in your blood after an overnight fast
- HbA1c: A three-month average of your blood sugar control
- Lipid panel: Includes HDL (“good” cholesterol), LDL, and triglycerides, which reflect how fats are being transported and stored
When numbers signal risk
Metabolic health sits on a spectrum. On one end, all of your markers are in the healthy range, and your metabolism is working efficiently. On the other, when several markers drift outside those ranges, this is called metabolic dysfunction – a state that increases the likelihood of type 2 diabetes, cardiovascular disease, fatty liver, and other chronic conditions.
One important stage along this spectrum is prediabetes. This means blood sugar levels are higher than normal but not yet in the diabetes range. Prediabetes is common, and it’s also reversible for many people when caught early.
Here are some of the cut-offs doctors and researchers use:
Fasting glucose:
- Normal: < 5.6 mmol/L (< 100 mg/dL)
- Prediabetes: 5.6–6.9 mmol/L (100–125 mg/dL)
- Diabetes: ≥ 7.0 mmol/L (≥ 126 mg/dL)
HbA1c (3-month average blood sugar):
- Normal: < 5.7%
- Prediabetes: 5.7–6.4%
- Diabetes: ≥ 6.5%
Waist circumference:
- Men: < 95 cm
- Women: < 80 cm
Blood pressure:
- ≥ 130/85 mmHg is considered a metabolic risk marker.
Blood fats (lipids):
- Triglycerides: ≥ 1.7 mmol/L (150 mg/dL) or higher
- HDL cholesterol: lower than 1.0 mmol/L (40 mg/dL) in men, or 1.3 mmol/L (50 mg/dL) in women
When three or more of these measures are outside the healthy range, this is called metabolic syndrome.
It’s not a disease itself, but a red flag that your metabolism is under strain.
The earlier these patterns are recognised, the more effectively they can be turned around with diet and lifestyle strategies and, where needed, medical support.
Deeper testing (where needed)
In functional medicine, we may go further if needed:
- Insulin testing: Fasting insulin gives more insight into early insulin resistance, often before glucose becomes abnormal
- Advanced lipid markers: Looking at particle size or ratios for a more detailed cardiovascular risk profile
- Continuous glucose monitoring (CGM): A wearable sensor that shows how your blood sugar responds to meals, sleep, stress, and exercise in real time
By combining these markers, we can see whether your metabolism is working efficiently or starting to show strain. More importantly, they give us a baseline – something we can measure against as you make changes and track improvements.
What shapes metabolic health
Metabolic health doesn’t come down to luck or a single choice – it’s the result of many daily inputs that either support or stress your system. Alongside supporting patients with natural compounds that improve metabolism, the four areas I pay closest attention to with patients are food, movement, sleep, and stress.
Food and nutrition
What and how you eat has a direct impact on blood sugar, cholesterol, and inflammation.
Diets high in ultra-processed foods, refined carbohydrates, and added sugars make it harder for your body to keep glucose and insulin in balance.
On the other hand, meals built around whole foods, quality proteins, healthy fats, and fibre create more stable energy and better metabolic outcomes.
Movement
Movement is one of the most effective ways to improve metabolic health, and the type of exercise matters.
A large review of clinical trials found that combining aerobic activity (like walking, cycling, or swimming) with resistance training (weights or bodyweight exercises) produced the greatest improvements in blood sugar, triglycerides, waist size, and insulin levels.
Aerobic exercise alone was especially helpful for improving BMI (body mass index) and HDL cholesterol, while resistance training uniquely reduced body fat, LDL cholesterol, and blood pressure. Together, they form a powerful prescription for a healthier metabolism.
Sleep
Poor sleep disrupts hormones that regulate appetite, cravings, and blood sugar.
Even a few nights of short or broken sleep can raise blood sugar levels.
One study found that reducing sleep duration to 6 hours per night for 6 weeks impairs insulin sensitivity, regardless of body composition.
Protecting 7-9 hours of good quality rest is one of the simplest but most overlooked tools for restoring metabolic balance.
Stress
Chronic stress keeps cortisol elevated, which in turn pushes blood sugar higher, disrupts sleep, and increases abdominal fat storage.
Practices that help regulate the nervous system – breathwork, meditation, time in nature, or simply creating boundaries with work – directly support metabolic health.
When these areas are in balance, the body becomes metabolically flexible – able to switch between burning carbohydrates and fat for fuel, keeping energy stable, and lowering disease risk. When they’re not, the system tips into strain, and symptoms or early warning signs begin to appear.
Your metabolic health can improve
One of the most important things I share with patients is that metabolic health is not fixed. Even if your markers are already out of range, they can often be improved – sometimes quite quickly – with the right interventions.
For example, small changes like adding a 10-15 minute walk after meals, improving the quality of your sleep, or reducing sugary drinks can begin shifting blood sugar and insulin levels within weeks.
Over time, consistent steps in nutrition, movement, sleep, and stress management add up to meaningful changes in lab results and, more importantly, in how you feel day to day.
Medications may be part of the picture for some people, but lifestyle is always foundational.
The more we can support your metabolism through daily choices, the less strain there is on the system as a whole.
Taking the first step
Metabolic health is central to your overall wellbeing. It influences energy, mood, weight, and long-term disease risk, and it can be measured, tracked, and improved.
The most effective way forward is to start with a clear baseline: check your waist measurement, blood pressure, and key lab tests.
From there, focus on one change you feel ready for – whether it’s building more movement into your day, protecting your sleep, or making meals with more whole foods.
As a functional medicine practitioner, I see time and again that even small, consistent changes create momentum. Supporting your metabolic health is one of the most powerful steps you can take to reclaim your vitality and change the trajectory of your long-term health.
