Why aren't these markers covered in routine checkups?

Most are, but they get reported without context. A ‘normal’ lab range usually means ‘not currently sick’ rather than ‘optimal.’ A fasting glucose of 5.4 mmol/L is ‘normal’ on a lab report and ‘worth watching’ from a metabolic-health perspective. The literacy gap is in interpretation, not measurement.

Should I get a continuous glucose monitor?

For 2-4 weeks as a learning tool, yes — it's useful for understanding how your specific body responds to specific meals. Longer-term wearing without clinical reason can drive orthorexic patterns, and the marginal information drops sharply after a few weeks. Talk to a clinician if you're considering medical use.

Is HbA1c the most important number?

It's the single most useful long-term metabolic snapshot — averaging glycaemic exposure over ~3 months. But it's a lagging indicator. Insulin resistance starts years before glucose moves. If HbA1c is rising, the underlying problem began long before.

What about cholesterol?

More complex than ‘low LDL = good.’ The current evidence is moderate-to-strong that the apoB / non-HDL cholesterol / particle-count framing is more predictive than total cholesterol. Have the conversation with your clinician, not the internet. We'd label specific dietary effects on cholesterol as ‘emerging to moderate’ depending on the intervention.

How often should I get these tested?

Most healthy adults: every 1-2 years from age 30, more often if anything is trending in the wrong direction or you have risk factors. Variability in lab assays is real, so trends across multiple readings matter more than any single value.

Can I reverse a worsening trend?

Often yes for early-stage metabolic dysfunction (insulin resistance, pre-diabetes) through sustained lifestyle change. Once established disease has set in (overt type 2 diabetes, cardiovascular events), the goal shifts to management. The earlier the intervention, the more reversible the picture. Talk to a clinician about your specific situation.

Metabolic health basics

The five-number dashboard

Most adults pay attention to weight on a scale and not much else. Weight is a noisy proxy for what actually matters — visceral fat, insulin sensitivity, lipid handling, blood pressure. The dashboard worth knowing is five numbers, four of which require a blood test you may have already had.

Waist-to-height ratio. Measured cheaply at home. Aim under 0.5.
Fasting glucose. Aim under 5.5 mmol/L (about 100 mg/dL).
HbA1c. Aim under 5.4%.
Triglyceride-to-HDL ratio. Aim under ~2 (mg/dL units) or under ~0.87 (mmol/L units).
Blood pressure. Aim under 120/80 mmHg, ideally measured over multiple readings.

The targets above are educational generalisations under our evidence policy; your personal targets depend on age, history, and clinical context. Discuss with a qualified clinician.

What each number means

Waist-to-height ratiois the cheapest, most sensitive marker for visceral fat — the metabolically active fat around organs that drives most of the systemic inflammation and insulin resistance. A ratio under 0.5 (for most adults) signals low visceral burden. It's a better predictor than BMI for many people, especially those with high muscle mass.

Fasting glucose measures how well your overnight glucose handling is working. Rising fasting glucose is one of the earlier signals of insulin resistance, though it lags behind insulin itself. Best measured after 8+ hours of fasting, ideally without recent illness or sleep deprivation.

HbA1creports the average glycation of your haemoglobin over roughly three months — so it's a moving 90-day average of blood glucose. Less affected by single-day spikes than fasting glucose. The most useful single number for long-term metabolic trend.

Triglyceride/HDL ratio is one of the best proxies for insulin resistance available without dedicated insulin testing. Both numbers come standard on a lipid panel. The ratio is more predictive than either number alone.

Blood pressure is the single most heavily-researched cardiovascular marker. Persistent elevation above ~130/80 is associated with progressive cardiovascular and kidney damage. Important: blood pressure has high day-to-day variability; trust multi-reading averages over a single anxious clinic measurement.

Normal vs optimal

Lab reference ranges describe what's typical in the population being measured. They aren't inherently aspirational. A fasting glucose of 5.3 mmol/L is ‘normal’ but already higher than what's associated with the best long-term outcomes.

The honest framing: ‘normal’ means ‘not currently sick.’ ‘Optimal’ means ‘associated with the best outcomes’ and is often a narrower band. You can be entirely ‘normal’ on every lab and still be drifting in the wrong direction across years. Trends matter more than single readings.

What moves the dashboard

The same handful of unglamorous interventions move all five numbers more than any single hack:

Sleep. 7-9 hours, consistent timing. See sleep better.
Strength training. 2-3x weekly. Muscle is a glucose sink; training it directly improves insulin sensitivity.
Cardio. 150+ minutes weekly of moderate intensity. Particularly helpful for blood pressure and lipid handling.
Protein adequacy. Roughly 1.6 g/kg bodyweight for most active adults; helps preserve lean mass during any caloric change.
Reducing ultra-processed food load. Stronger evidence each year that food matrix (not just macros) matters for metabolic health.
Limiting alcohol. Affects triglycerides, blood pressure, sleep, and liver fat — directly disrupts several dashboard numbers simultaneously.

None require supplements. The supplements come last, after these are stable.

When to talk to a clinician

See a clinician if (a) any of the five numbers is in or near the warning ranges, (b) you have a family history of type 2 diabetes, cardiovascular disease, or related conditions, (c) you're over 35 and haven't had recent labs, or (d) you're considering significant dietary changes, medications, or supplements that interact with metabolic markers (including GLP-1 agonists, statins, or hormone therapy).

Use the health questions for your doctor worksheet to structure the appointment.

Common mistakes

Watching weight on a scale and ignoring the dashboard.
Treating ‘normal’ lab ranges as ‘optimal.’
Reading a single result without checking the trend.
Buying supplements before fixing sleep and movement.
Doing extreme protocols without baseline labs.
Ignoring blood pressure because it doesn't feel like anything.
Self-prescribing based on internet content rather than working with a clinician.

Topic: Sleep better.
Topic: Brain health.
Micro-course: Metabolic Mastery.
Tool: Metabolic health checklist.
Worksheet: Metabolic dashboard tracker.
Path: Health Foundations for Busy Adults.