Your Blood Tests Are “Normal”… So Why Do You Still Feel Unwell?

By Nick Howarth – Ancestral Diet Researcher & Global Metabolic Health Coach

There are few phrases in modern healthcare more misleading—and frankly more dangerous—than this one: “Your labs are normal.”

It sounds reassuring. It sounds final. It sounds like the case is closed. But what most people don’t realise is that “normal” does not mean healthy. It simply means average. And when the average person today is metabolically compromised, inflamed, overweight, fatigued, and hormonally dysregulated, being “normal” often means you are quietly sitting in the same category.

In clinical reality, this shows up all the time. People walk into a consultation clearly unwell. They struggle with weight, their hair is thinning, their skin is problematic, their energy is low, and yet their blood tests come back within range. Then comes the dismissal. “There’s nothing wrong.” In some cases, they are even told it is psychological. That is not just inaccurate—it is a failure of interpretation.

To understand why this happens, you have to first understand how “normal ranges” are created.

The Problem with “Normal”

Laboratory reference ranges are built using what is essentially a statistical bell curve. The lowest and highest extremes are removed, and what remains in the middle is labelled “normal.” The problem is obvious once you step back and look at the broader picture. If the population itself becomes progressively more unhealthy, the reference range shifts along with it.

This has happened repeatedly over the years. In 1997, the diagnostic threshold for fasting blood glucose was lowered from 140 mg/dL to 126 mg/dL. Overnight, 1.4 million people were suddenly classified as diabetic. Nothing changed in their physiology. Only the number changed.

Then in 2003, the threshold for pre-diabetes dropped from 110 mg/dL to 100 mg/dL. Another 41 million people were instantly labelled pre-diabetic. Again, no sudden global metabolic collapse—just a redefinition of the scale.

The same pattern has played out with cholesterol, where millions were reclassified as “high risk” following guideline changes, and with vitamin D, where flawed calculations led to dramatically underestimated requirements that have never been corrected.

So when someone tells you your labs are normal, the real question is: normal compared to what?

The Vitamin D Miscalculation That Never Got Fixed

One of the more striking examples involves vitamin D. The recommended daily intake was set at around 600 IU, but calculations later showed that approximately 8,895 IU would be required to maintain even minimal levels of 20 ng/mL and prevent conditions like rickets. That is not a rounding error—it is a fundamental miscalculation.

Even more concerning is that a blood level of 20 ng/mL, often considered acceptable, is in reality a severe deficiency in many cases. Individuals at this level frequently experience symptoms ranging from fatigue to immune dysfunction, yet they are reassured that everything is “within range.”

The Biggest Blind Spot in Modern Testing: Insulin

Perhaps the most critical oversight in routine blood testing is the near-total neglect of insulin measurement. Glucose is tested almost universally, yet insulin—arguably the more important marker—is rarely checked.

This creates a dangerous illusion. Blood glucose can appear perfectly normal while insulin is elevated and working overtime behind the scenes. The pancreas is effectively shouting, but the signal is ignored because glucose looks acceptable.

Insulin levels often rise 15 to 20 years before glucose begins to climb. By the time glucose becomes abnormal, the process has been underway for decades.

A healthy fasting insulin level should ideally fall between 2 and 6. At 8, concern is warranted. Between 10 and 12, the individual is already moving toward insulin resistance and pre-diabetes. Yet values in this range are often still labelled “normal.”

This is where deeper analysis becomes essential.

HOMA-IR: Seeing the Relationship, Not Just the Numbers

To better understand metabolic health, one must look at how insulin and glucose interact. The HOMA-IR calculation combines both markers to reveal whether insulin resistance is present.

When carbohydrates are consumed in excess, glucose floods the bloodstream. Insulin is released to manage it, and this process repeats day after day. Over time, the body adapts by becoming resistant to insulin’s signal. As a result, more insulin is produced, placing further strain on the pancreas.

Eventually, the system fails. Glucose rises, and a diagnosis is made—but only after years of underlying dysfunction.

Had insulin or HOMA-IR been assessed earlier, the trajectory could have been identified long before disease developed.

A1C: The Long-Term View

While fasting glucose offers a snapshot, HbA1c provides a broader perspective. It reflects the average blood sugar over approximately three months by measuring how much glucose has been attached to red blood cells.

However, even this test has limitations. A person who eats well during the week but indulges heavily on weekends may still produce an acceptable average. The spikes are diluted in the overall picture.

It is useful—but not definitive.

The Dawn Phenomenon: When the Body Makes Its Own Sugar

Some individuals experience elevated blood sugar in the morning despite not consuming carbohydrates. This is known as the dawn phenomenon.

It can occur due to elevated cortisol, which mobilises glucose, or because the liver begins producing sugar independently. In cases of insulin resistance, the liver’s regulation becomes impaired, and it generates glucose even when it is not needed.

In severe insulin resistance, up to 80% of blood glucose can originate from the liver itself.

The solution is not medication alone, but addressing the root cause. Reducing carbohydrate intake and incorporating intermittent fasting can, over time, restore proper regulation and bring morning glucose levels back to normal.

Why Mineral Testing Often Misses Deficiencies

Standard blood tests are notoriously poor at detecting mineral deficiencies. Nutrients such as magnesium, potassium, zinc, and selenium are stored primarily within tissues, not circulating in the blood.

Blood levels may appear normal because the body maintains a narrow range in circulation, even at the expense of cellular reserves. In effect, the body borrows from its tissues to keep blood levels stable, masking deficiency.

This is why individuals can be functionally deficient while their labs appear normal.

B12: The Active vs Inactive Problem

A similar issue arises with vitamin B12 testing. Standard tests measure both active and inactive forms, which can give a misleading impression of adequacy.

More accurate insight can be obtained through markers such as methylmalonic acid (MMA) or homocysteine, which reflect functional B12 status more reliably.

CRP: The Inflammation Marker That’s Misinterpreted

C-reactive protein (CRP) is a key marker of inflammation. Many practitioners consider values below 3 acceptable, but this is a reflection of population averages, not optimal health.

A truly healthy CRP should be as close to zero as possible, ideally below 1. Values around 1.5 to 2 indicate a chronic low-grade inflammatory state—something that should not be ignored.

Reducing inflammation requires addressing diet, eliminating refined carbohydrates and seed oils, improving sleep, and reducing visceral fat. Omega-3 fats, particularly from sources like cod liver oil, can also play a role.

Cholesterol: More Than Just a Number

Cholesterol is often misunderstood. It is not inherently harmful; it is a substance the body produces for essential functions.

What matters is not just the level, but the type of lipoprotein carrying it. LDL is frequently labelled “bad,” yet it serves as a transport mechanism. Within LDL, there are two distinct patterns.

Pattern A consists of large, buoyant particles that are less likely to contribute to arterial damage. Pattern B consists of small, dense particles that are more likely to penetrate arterial walls and contribute to inflammation.

Low-carbohydrate diets tend to promote Pattern A, while high-carbohydrate diets are associated with Pattern B.

Standard cholesterol tests do not distinguish between these patterns. A specialised lipid profile is required to see the full picture.

Cortisol: A Hormone You Can’t Capture in One Moment

Cortisol follows a daily rhythm, rising and falling throughout the day. A single blood test cannot capture this pattern.

More accurate assessment involves multiple measurements, such as saliva testing throughout the day and night. Alternatively, heart rate variability (HRV) can provide indirect insight into stress and autonomic nervous system balance.

Modern wearable technology has made this increasingly accessible.

Vitamin D: The Illusion of Normal

Even when vitamin D levels appear normal in blood tests, this does not guarantee adequate function at the cellular level. Many individuals experience what can be described as vitamin D resistance, where levels in the blood do not translate into effective utilisation in tissues.

One way to assess this indirectly is by measuring parathyroid hormone. Elevated levels may indicate that vitamin D is not functioning properly, even if blood levels appear sufficient.

Optimal vitamin D levels are often closer to 50–70 ng/mL, far above the commonly accepted minimums.

The Real Takeaway

The fundamental issue is not that blood tests are useless—it is that they are often interpreted too simplistically.

Health is not defined by whether you fall within a statistical range. It is defined by how your body functions.

If you feel unwell, if your energy is low, if your metabolism is not responding, then the answer is not to accept “normal” as a conclusion. It is to dig deeper, ask better questions, and understand the physiology behind the numbers.

Because in a world where dysfunction has become common, being average is not a goal.

And “normal” is not the same as healthy.