Quick Answer: After age 40, five key metabolic markers – fasting insulin, triglyceride-to-HDL ratio, fasting glucose, HbA1c, and C-reactive protein (CRP) – can reveal your true cardiovascular risk years before symptoms appear. Most standard checkups don’t test all five. Knowing and optimizing these numbers gives you a meaningful edge in long-term cardiometabolic protection.
Most men over 40 walk out of their annual physical feeling reassured. Cholesterol? “Normal.” Blood pressure? “Fine.” And yet, cardiovascular disease remains the leading cause of death among men in the United States – often striking those who believed they were healthy. The problem is that the standard screening panel frequently misses the earliest, most actionable warning signs.
Root cause medicine and functional medicine approaches take a different view. Rather than waiting for a disease to declare itself, a systems-based medicine model asks: what do your numbers look like before the damage is done? Cardiometabolic risk – the intersection of heart disease, metabolic dysfunction, and inflammatory processes – builds silently over years. By the time symptoms appear, the window for easy intervention has often closed.
The good news is that we can identify the markers of early risk, and they’re largely modifiable. You don’t need extraordinary interventions.
Let’s walk through the five most important numbers for men’s metabolic health after 40, explain what each one reveals, and outline the additional markers worth tracking as part of a comprehensive preventative approach.
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Why Standard Men’s Health Screenings Often Miss the Mark
A typical annual physical for a man over 40 might include a basic lipid panel, fasting glucose, blood pressure, and a body weight measurement. These are useful starting points, but they’re a narrow slice of cardiometabolic health.
The conventional approach tends to identify disease once it has already progressed. Integrative cardiometabolic health instead focuses on detecting dysfunction in its earliest stages, when lifestyle, nutrition, and targeted interventions can reverse or significantly slow the trajectory.
Holistic medicine and integrative medicine both recognize that cardiovascular risk doesn’t arise from a single variable. It emerges from a web of metabolic, inflammatory, and hormonal imbalances that interact over time (1).
The five numbers below reflect this broader picture. Each one offers a window into a different dimension of how your body is functioning, and they provide a far more complete assessment of your long-term risk.
Related: 3 Risks That Drive Cardiometabolic Disease
1. Fasting Insulin: The Earliest Warning Sign
While fasting glucose is routinely measured, insulin is rarely included in standard panels, even though elevated insulin often precedes elevated glucose by years, sometimes decades (2).
Insulin resistance is a state in which your cells become less responsive to insulin’s signals, forcing the pancreas to produce increasingly larger amounts to maintain normal blood sugar. This state is closely linked to visceral fat accumulation, chronic inflammation, hypertension, and an elevated risk of both type 2 diabetes and cardiovascular disease (3).
What to aim for: A fasting insulin level between 2.52-13.14 μU/mL is considered normal (4), but a tighter “optimal” fasting insulin range is likely between 2 and 10 μU/mL. Conventional labs may accept levels up to 25 µIU/mL as “normal (5),” which means a man with a fasting insulin of 18 µIU/mL may be told his results are normal while already progressing toward significant metabolic dysfunction.
2. Triglyceride-to-HDL Ratio: A Smarter Way to Assess Cardiovascular Risk
The triglyceride-to-HDL (TG:HDL) ratio is one of the most reliable markers in a comprehensive men’s health screening. Both triglycerides and HDL cholesterol appear on a standard lipid panel.
The TG:HDL ratio is a strong predictor of insulin resistance and cardiovascular risk, often performing better than LDL cholesterol alone (6). A high triglyceride count combined with low HDL suggests the presence of small, dense LDL particles—the type most associated with arterial plaque formation (7).
What to aim for: A TG:HDL ratio below 2.0 is generally considered favorable. A ratio above 3.5 warrants closer attention and a conversation with your provider about dietary patterns, metabolic health, and cardiovascular risk reduction strategies (8).
Shop: ProOmega Cholesterol Support for Cardiovascular Health
3. Fasting Glucose: An Essential Marker
Fasting glucose is the most commonly measured metabolic marker, because chronically elevated blood sugar causes widespread damage to blood vessels, nerves, and organs (9).
The trouble is, a single reading in the “normal” range doesn’t rule out metabolic dysfunction, particularly if insulin levels are already elevated (see marker #1). Blood glucose fluctuates, and a snapshot taken after overnight fasting can appear normal even in men whose glucose is dysregulated throughout the day.
What to aim for:
- 70–85 mg/dL – Optimal fasting glucose
- 86–99 mg/dL – technically within the “normal” range but may reflect early metabolic stress
- 100–125 mg/dL – Pre-diabetes
- 126 mg/dL or above – Type 2 diabetes
4. HbA1c: Your 90-Day Blood Sugar Average
Fasting glucose captures a moment in time, but HbA1c (glycated hemoglobin) reflects your average blood sugar levels over the preceding two to three months.
Persistently elevated HbA1c, even within ranges technically labeled “normal,” is associated with accelerated arterial aging, increased inflammation, and heightened cardiovascular risk (10). Men in the upper end of the “normal” range often show measurable signs of endothelial dysfunction – reduced flexibility in blood vessel walls – that standard cardiovascular screenings don’t detect.
What to aim for:
- Below 5.4% – Optimal from an integrative cardiometabolic standpoint
- Between 5.5–5.7% indicate early metabolic strain
- Between 5.7–6.4% – Prediabetes
- 6.5% or above – Diabetes
HbA1c is one of the most actionable markers on this list. Meaningful improvements are achievable within a few months through targeted dietary changes, resistance training, improved sleep, and stress management.
Read: Reversing Prediabetes – An Integrative Approach
5. C-Reactive Protein (CRP): Inflammation Marker Linked to Heart Disease
Chronic, low-grade inflammation is a root cause of cardiovascular disease, metabolic dysfunction, and a broad range of age-related conditions (11). C-reactive protein, specifically the high-sensitivity version (hs-CRP), is the most accessible blood marker for detecting this ongoing inflammatory burden.
A landmark study published in the New England Journal of Medicine (the JUPITER trial) found that men with normal LDL cholesterol but elevated hs-CRP had significantly higher rates of cardiovascular events (12). This finding reinforced what root cause medicine practitioners have long recognized: inflammation drives cardiovascular risk independently of cholesterol levels.
What to aim for (13):
- hs-CRP below 1.0 mg/L – Low risk
- Between 1.0–3.0 mg/L – Moderate risk
- Above 3.0 mg/L – elevated cardiovascular risk that warrants investigation
- Above 10 mg/L – Acute infection or inflammatory condition unrelated to chronic cardiovascular risk and should be interpreted carefully
Elevated CRP responds well to anti-inflammatory lifestyle strategies – omega-3 fatty acid intake, Mediterranean-style dietary patterns, regular movement, stress reduction, and sleep optimization (14).
Additional Numbers Worth Tracking After 40
The five markers above form the core of a proactive men’s health screening. But a complete cardiometabolic picture also benefits from monitoring several additional variables.
Waist Circumference
Visceral fat – the fat stored around the organs inside the abdominal cavity – is metabolically active and pro-inflammatory (15). Waist circumference is a simple, reliable proxy for visceral fat accumulation. A measurement above 40 inches (102 cm) in men is associated with significantly increased cardiometabolic risk (16).
Blood Pressure
Hypertension is a major modifiable risk factor for heart disease and stroke. Optimal blood pressure is generally considered 120/80 mmHg or below. Consistent readings above 130/85 warrant attention and a systems-based evaluation of contributing factors.
Full Lipid Panel and Advanced Cholesterol Markers
Beyond the TG:HDL ratio, a comprehensive lipid assessment may include LDL particle number (LDL-P), ApoB, and Lipoprotein(a).
Testosterone and Hormonal Health
Testosterone levels decline steadily after 30, with meaningful drops often appearing by the mid-40s. Low testosterone is associated with insulin resistance, visceral fat accumulation, reduced muscle mass, and increased cardiovascular risk. Including total and free testosterone in a comprehensive men’s health checkup provides important context for metabolic and cardiovascular findings.
How to Use These Numbers: A Whole Person Health Approach
A functional medicine or integrative medicine approach doesn’t treat elevated CRP or a suboptimal TG:HDL ratio as isolated problems to be managed with a single intervention. These markers are signals of underlying imbalances in nutrition, movement, sleep, stress, gut health, and hormonal function. A systems-based medicine framework asks: why are these numbers elevated, and what needs to shift at the root level?
For men over 40, this means building a health strategy around a few core principles:
- Get the full picture tested. Advocate for comprehensive metabolic panels that include fasting insulin, hs-CRP, and HbA1c.
- Establish a baseline. Even optimal numbers benefit from being tracked over time. Trends matter as much as single readings.
- Work with a clinician who practices whole person health. A provider trained in integrative cardiometabolic health will interpret these markers in context alongside your lifestyle, family history, symptoms, and goals.
- Take targeted action. Dietary changes, resistance training, sleep hygiene, and stress management have documented effects on every marker listed here.
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The standard narrative tells men to show up for an annual physical, get a basic blood panel, and go home reassured. This approach catches disease. but only after it has already taken hold. Preventative screenings for men, done comprehensively and interpreted through an integrative lens, offer the opportunity to intervene before the damage is done.
Knowing your fasting insulin, TG:HDL ratio, fasting glucose, HbA1c, and hs-CRP gives you real, actionable insight into how your cardiovascular and metabolic systems are functioning right now. Paired with waist circumference, blood pressure, a full lipid panel, and hormonal markers, these numbers form a complete map of your current health, and a guide for where to go next.
Frequently Asked Questions
What blood tests should men over 40 ask for at their annual checkup?
Men over 40 should request a comprehensive metabolic panel that goes beyond standard cholesterol and glucose testing. Key additions include fasting insulin, high-sensitivity C-reactive protein (hs-CRP), HbA1c, and a full lipid panel that allows calculation of the triglyceride-to-HDL ratio. Testosterone (total and free) and waist circumference measurement are also valuable components of a thorough men’s health screening.
What is a healthy fasting insulin level for men?
From a functional medicine perspective, a fasting insulin level between 2.52-13.14 μU/mL is considered normal. A tighter “optimal” fasting insulin range is likely between 2 and 10 μU/mL. Conventional lab reference ranges may accept values up to 25 µIU/mL as normal.
What does the triglyceride-to-HDL ratio tell you about heart health?
The triglyceride-to-HDL ratio is a practical marker for insulin resistance and cardiovascular risk. A ratio below 2.0 is generally favorable. A ratio above 3.5 suggests the presence of metabolically harmful lipid patterns that increase the risk of arterial plaque formation and cardiovascular events.
Can elevated CRP levels be reduced through lifestyle changes?
Yes. High-sensitivity CRP levels respond meaningfully to anti-inflammatory lifestyle interventions. These include adopting a Mediterranean-style dietary pattern, increasing omega-3 fatty acid intake, engaging in regular moderate-intensity exercise, prioritizing 7 to 9 hours of sleep per night, and implementing evidence-based stress management practices.
How is a functional medicine approach to men’s health different from conventional care?
Functional and integrative medicine approaches focus on identifying and addressing the root causes of metabolic dysfunction rather than managing symptoms after they appear. A systems-based medicine framework evaluates markers like fasting insulin, CRP, and HbA1c in context, alongside diet, sleep, stress, hormonal health, and lifestyle factors, to create a personalized, whole-person health plan.
At what age should men start tracking these cardiometabolic markers?
While these markers are particularly important after 40, establishing a baseline in your 30s can be valuable, especially with a family history of cardiovascular disease or metabolic conditions. Cardiometabolic risk builds gradually, and earlier awareness creates more time and opportunity for meaningful preventive action.
