Three early signs of metabolic dysfunction: what fasting insulin, HOMA-IR and uric acid reveal

Most people rarely ask themselves, “Do I have a metabolic issue?” and largely because many are unclear what a metabolic disease is, and even if they do know, the earliest signs are subtle. 

Symptoms that can indicate metabolic disease, such as fatigue, increased thirst, headaches, or difficulty concentrating, can be easy to miss, especially when life gets busy.

Even high blood pressure – one of the most common metabolic risk factors – often has no symptoms until it reaches dangerously high levels. But left unchecked, these early signs can lead to major chronic health conditions like type 2 diabetes, obesity, fatty liver, and heart disease. 

In this article, we break down what metabolic diseases are, how they evolve, and why critical early biomarkers – fasting insulin, HOMA‑IR, uric acid, HbA1C, fasting glucose – offer some of the earliest clues that your metabolism is under strain. 

What conditions are classified as metabolic diseases?

Metabolic health comes down to how the body uses and produces energy. Therefore, metabolic diseases affect the body’s energy systems. Common examples include: 

Type 2 diabetes: When the body becomes less effective at using insulin, a hormone produced by the pancreas that helps move glucose (sugar) from your bloodstream into your cells where it's used for energy. When insulin doesn’t work well, blood sugar stays high for long periods, which puts stress on many organs and can lead to long‑term health problems. 

Obesity: Carrying too much body fat in a way that harms your health. Excess fat disrupts normal metabolic and hormonal functions, making it harder for the body to regulate appetite, blood sugar, inflammation and energy use. Over time, this increases the risk of conditions like Type 2 diabetes, fatty liver disease, heart disease, and certain cancers. 

Thyroid disorders: When your thyroid gland makes either too much hormone (overactive) or too little (underactive). Because thyroid hormones control how fast or slow your body uses energy, this imbalance speeds up or slows down your metabolism. If the thyroid stays unbalanced for a long time, it could affect your heart, brain, bones, weight, hormones, and energy levels. 

Metabolic dysfunction–associated steatotic liver disease, MASLD (formerly known as fatty liver disease or non-alcoholic fatty liver disease, NAFLD): When too much fat builds in the liver it can cause inflammation and scarring. If this damage becomes severe and irreversible, it can lead to liver failure, liver cancer, and a higher risk of cardiovascular disease. 

Recently, a shift in nomenclature was made to this disease to improve clarity on the label. The new name focuses on the real cause – problems with metabolism. The old terms also included words like ‘non‑alcoholic’ and ‘fatty’ which were also seen as negative and could make people feel judged. 

Dyslipidemia: Having unhealthy levels of fat in your blood – usually cholesterol, triglycerides or both. When these fats stay out of balance for too long, they can build up in your arteries, narrow them, and make it harder for blood to flow properly, raising the risk of heart attack and stroke. 

Metabolic syndrome: Occurs when an individual has three or more of the following metabolic risk factors: 

1. Abdominal obesity 
2. Insulin resistance 
3. High blood pressure 
4. Abnormal cholesterol/triglycerides 
5. Elevated fasting blood sugar 

To meet diagnostic clinical criteria in Canada for metabolic syndrome, a patient must fall into three of the risk factor categories:

• Large waist circumference - Men ≥ 102 cm; Women ≥ 88 cm 
• High fasting glucose -≥ 5.6 mmol/L (or treated) 
• High triglycerides - ≥ 1.7 mmol/L (or treated) 
• Low HDL cholesterol - Men < 1.0 mmol/L; Women < 1.3 mmol/L 
• High blood pressure - ≥ 130/85 mm Hg (or treated) 

It’s important to note that when you see “(or treated)” after a metabolic syndrome criterion, it means that a person may be taking a medication to control a risk factor. However, it still counts as meeting the criteria even if their current lab number looks normal because of the treatment. 

Metabolic syndrome is a pivotal point and precursor to more serious metabolic diseases. Left unaddressed, metabolic issues can progress into cardiometabolic disease, where underlying metabolic problems begin damaging the heart, blood vessels, and circulation. Cardiometabolic diseases include heart disease, stroke, atherosclerosis, heart failure, and vascular disease. It’s a progression that goes like this: 

Metabolic dysfunction → inflammation → vascular & cardiac damage 

In Canada, cardiometabolic disease remains a leading cause of illness and death. Meanwhile, approximately 1 in 3 Canadians have diabetes or prediabetes.

Additionally, the burden of metabolic conditions across the country is also significant. Roughly one‑quarter of adults have metabolic syndrome, one‑third meet the criteria for obesity and about half have abdominal obesity. Being in any of these categories can put you at a high risk of metabolic and cardiometabolic diseases.  

And because metabolic issues often develop silently, early testing is essential. There are several biomarkers that can reveal underlying stress long before symptoms appear. These are not often tested during regular check-ups but are included for everyone who completes Medcan’s proactive Annual Health Assessment. 

Metabolic biomarkers to test regularly 

Our evidence‑based approach means we continuously review the latest medical research and draw on our clinical experience to deliver the most proactive and comprehensive health evaluations. 

As part of this commitment, we’ve added three additional biomarkers – fasting insulin, HOMA‑IR and uric acid – to the Annual Health Assessment. These markers offer a clearer and earlier view of metabolic health, helping you identify potential risks sooner. 

Traditional metabolic screening includes measures like fasting glucose and HbA1c, which remain important, especially for diagnosing and monitoring prediabetes and diabetes, but research shows they often detect problems only after they have progressed. By the time these numbers rise, insulin resistance may have been developing silently for years. 

To understand how these five biomarkers show different aspects that reveal a full picture of metabolic health, it helps to start with a basic understanding of insulin resistance.  

Glucose rises → insulin spikes → insulin resistance develops → prediabetes (reversible) → type 2 diabetes

The goal is to catch problems at the earliest stage, and this is where fasting insulin and HOMA-IR are critical biomarkers.  

Fasting insulin, HOMA-IR and uric acid

These proactive metabolic biomarkers help answer three critical questions: 

• Fasting insulin → How hard is the body working to maintain normal glucose? 
• HOMA‑IR → How resistant are the cells to insulin? 
• Uric acid → How much metabolic stress is present? 

Fasting insulin 

A single blood test after 8 hours of fasting. 

Fasting insulin rises long before fasting glucose or HbA1c ever change. In the early stages of metabolic dysfunction, your cells begin to resist insulin, so your pancreas makes extra insulin to keep your blood sugar in a normal range. This can go on for years, which means your glucose and HbA1c might still look “normal,” even though your insulin is already higher than it should be. Because of this, fasting insulin is an early warning sign, showing metabolic strain long before regular glucose tests pick it up. 

A high fasting insulin level signals early risk for diabetes. High fasting insulin is an indicator your pancreas is working harder than it should and that you may be moving toward insulin resistance. 

It often becomes abnormal as much as five to ten years before changes show up in fasting glucose or HbA1c, giving you a much earlier chance to intervene. 

HOMA‑IR 

A calculation using fasting insulin and fasting glucose. 

HOMA‑IR is a calculation that uses both fasting insulin and fasting glucose to estimate insulin resistance.  

Since glucose often stays normal for a long time due to the pancreas’ ability to overproduce insulin, HOMA‑IR exposes the work your body is doing behind the scenes to maintain those normal glucose levels.  

A high HOMA‑IR score may indicate that your metabolism is under stress even if your fasting glucose and HbA1c remain in normal range. This makes it one of the most sensitive early indicators of developing metabolic disease. 

It is a highly useful early indicator of future risk of cardiovascular disease, fatty liver disease, and type 2 diabetes. It is even linked to cognitive decline, making it a biomarker you’ll want to monitor proactively. 

Uric acid 

A single blood test reflecting metabolic load. Uric acid can also be evaluated with a 24-hour urine collection test. 

Uric acid rises when your metabolism is under stress, especially during early insulin resistance. And when insulin resistance becomes an issue, the kidneys become less effective at clearing uric acid. 

Uric acid is a normal waste product your body makes when it breaks down purines, which are found in DNA and RNA and consumed in food. Everyone produces uric acid every day, and the kidneys filter it out so it can be removed through urine. But when the kidneys can’t keep up, uric acid builds up. This creates ongoing metabolic stress and increases the risk of gout, kidney stones, high blood pressure, cardiovascular disease, and oxidative stress. 

These changes often happen long before blood sugar becomes elevated. Because of this, higher uric acid can be an early sign that your body is struggling to process energy or clear metabolic waste efficiently. It provides an additional early window into metabolic dysfunction, even before glucose levels start to shift. 

In addition to these three early screening biomarkers, fasting glucose and HbA1c continue to provide valuable insights and remain essential components of a complete metabolic assessment. 

HbA1c 

A blood test that checks how much of your hemoglobin (the protein in red blood cells) has sugar attached to it. 

HbA1c measures the percentage of hemoglobin, a protein in red blood cells, that has sugar attached to it.  The number reflects your average blood sugar over the past 2–3 months, because red blood cells live for about 90 days. It’s a useful metabolic biomarker to track because it shows long‑term patterns, not simply daily ups and downs. 

Higher HbA1c means your blood sugar has been elevated consistently, which is a sign of metabolic issues. It is used to diagnose prediabetes and diabetes, and higher levels are linked to complications affecting the heart, kidneys, eyes, and nerves. 

Fasting glucose 

A single blood test after 8 hours of fasting. 

Fasting glucose measures the amount of sugar (glucose) in your blood after you haven’t eaten for at least 8 hours. It shows how well your body manages blood sugar at the moment. 

High fasting glucose suggests your cells aren’t responding, and sugar is staying in your bloodstream instead of being used for energy. It’s one of the earliest signs of developing metabolic problems like prediabetes or type 2 diabetes. It’s also one of the official diagnostic criteria used to identify metabolic syndrome.  

While extremely valuable, these markers alone may miss early insulin resistance, often present long before glucose rises. 

Early biomarker insights help you take preventative steps toward optimal metabolic health 

Tracking fasting insulin, HOMA‑IR, and uric acid provides a clearer picture of metabolic health before symptoms develop. These tests can identify subtle metabolic stress, help pinpoint where you are on the disease‑progression spectrum, and guide targeted interventions to prevent chronic illness. 

By evaluating these markers, you gain insight into both your current metabolic state and your future cardiometabolic risk, enabling timely and preventive action rather than reacting after disease has taken hold.  

Take action

Looking to assess your metabolic biomarkers? Medcan’s Annual Health Assessment includes fasting insulin, HOMA-IR and uric acid as part of the 100+ biomarkers we test in this full-body physician-led evaluation that goes far beyond a regular checkup. 

This proactive assessment helps you identify critical risk areas and increases the opportunity for early detection of significant health concerns, such as cancer, heart disease, and diabetes.  

As part of the process, a physician will guide you through your results and build a personalized evidence-based action plan to target your areas of improvement and meet your health goals. 

For additional support for healthy eating, Medcan offers nutrition and weight management programs led by world-renowned experts – learn more here. 

This article was written by Medcan’s editorial team in collaboration with our clinical innovation team and review and contribution from Medcan’s Vice President of Medical Affairs, Dr. Jason Abrams, and Endocrinologist, Dr. Amish Parikh.

_______

This content is for informational purposes only and should not be taken as medical advice. Please consult a Medcan clinician or your healthcare provider for guidance tailored to your health needs.