Why Heart Disease Builds Quietly Before It Strikes
Executive Summary
My earlier white paper titled The Long Road to a “Sudden” Heart Attack explained why many heart attacks are not truly sudden. They are often the final visible event after years of quiet biological drift. This sequel goes deeper into one of the most important hidden drivers of that drift: insulin resistance.
Insulin resistance is understood by many as a blood sugar problem. Blood sugar is only one part of the story. Insulin is a master signal that speaks to almost every cell in the body. It tells the body whether to store fuel, burn fuel, make fat, release fat, build tissue, hold water, regulate blood vessel tone, and respond to energy stress. When that signal becomes problematic, the whole body begins to move away from repair and towards disease.
The danger is that early insulin resistance can exist while fasting glucose and HbA1c still look normal, while the pancreas may be producing more and more insulin to keep glucose under control. So the glucose report looks acceptable, but the body is already paying a price. This is why many believe they are safe because their annual blood test is “not too bad,” while their waist is increasing, blood pressure is rising, triglycerides are high, HDL is low, sleep is poor, stress is constant, cravings are stronger, liver fat is building, and energy is no longer steady. The point to note clearly is this: insulin can rise years before glucose rises, which means a glucose-only view can miss the early warning signal.
Heart disease then becomes easier to understand. It is more than just a cholesterol problem. It is a living artery wall responding to metabolic pressure. Insulin resistance can damage the inner lining of blood vessels, increase blood pressure, alter cholesterol particle behaviour, raise triglycerides, lower HDL, increase inflammation, promote fatty liver, increase visceral belly fat, reduce fat burning, disturb clotting balance, and reduce the body’s ability to repair. Modern research supports this connection between insulin resistance, metabolic syndrome, endothelial dysfunction and cardiovascular disease.
The Missing Link
My earlier white paper made one point clear: the heart attack is often the event, not the beginning. This sequel asks what often drives the road before the event.
For many people, the missing link is insulin resistance. It quietly connects the patterns that are often treated separately. High blood pressure is treated as one problem. Belly fat is treated as another. High triglycerides are treated as another. Fatty liver is treated as another. Prediabetes is treated as another. Poor sleep, cravings, low energy, inflammation, and weight gain are often explained away as age or stress. Yet in the body, these are not separate stories. They often come from one disturbed energy system.
Metabolic syndrome is the cluster of high waist circumference, high blood pressure, high triglycerides, high glucose, and low HDL.
This matters because the working professional often has the exact lifestyle that feeds this pattern. Long sitting hours reduce muscle glucose use. Stress hormones keep glucose available for threat. Late meals keep insulin elevated. Alcohol worsens sleep and liver function. Poor sleep makes insulin work less effectively. Ultra-processed foods give fast glucose and fast fat together, which overwhelms the system. Business pressure then normalises the symptoms. The person is still productive, so the body’s early signals are ignored. This is how disease hides in high performance.
What Insulin Actually Does
Insulin is commonly introduced as the hormone that lowers blood sugar. That is true, but it is incomplete.
A better way to understand insulin is this: insulin is a fuel-storage and fuel-direction hormone. When insulin rises after food, it tells the body that fuel is available. It helps move glucose into muscle and liver. It tells the liver to reduce glucose production. It encourages storage. It reduces fat release from fat cells. It reduces fat burning. It tells the body, “Use and store incoming fuel now.”
That is normal after a meal. The problem begins when insulin stays high too often, for too long, and the body stops responding properly.
Insulin resistance has two sides. First, some cells stop listening properly to insulin. Second, because the body still needs to control glucose, the pancreas produces more insulin. This means the body can be insulin resistant and still have high insulin at the same time. That is why insulin resistance and high insulin usually travel together.
This creates a confusing situation inside the body. Some cells are not listening enough, while other cells are being overstimulated. Blood vessels may not respond properly to insulin’s healthy relaxing signal. Fat cells may keep growing. The liver may keep producing triglycerides. The kidneys may retain more sodium and fluid. The nervous system may remain more activated. The whole system becomes metabolically dysfunctional.
This is why insulin resistance is not simply “pre-diabetes.” It is a whole-body signalling disorder.
Why Normal Glucose Can Be Misleading
Many people are falsely reassured by normal fasting glucose. This happens because glucose may stay normal while insulin is rising in the background.
In the early years, the pancreas compensates. It pushes out more insulin to keep blood glucose in range. The laboratory report may still show normal glucose, but the body has needed extra insulin to achieve that result. In other words, the number looks normal because the body is working harder. By the time fasting glucose or HbA1c becomes clearly abnormal, the person may already have spent many years in high-insulin biology.
For heart health, this is critical. The artery wall does not wait for diabetes before it is affected. It is exposed every day to high insulin, high glucose swings, high blood pressure, inflammatory signals, altered lipoproteins, poor sleep chemistry, oxidative stress, and visceral fat signalling. That is why waiting for diabetes before acting is too late for many people.
The functional question is therefore not, “Is my glucose still normal?” The better question is, “How much insulin does my body need to keep glucose normal?”
How Insulin Resistance Creates the Heart Disease Environment
Heart disease develops when the artery wall becomes vulnerable. Cholesterol particles matter, especially ApoB-containing particles, because they can enter the artery wall. The artery wall responds to injury, pressure, inflammation, immune activity, glucose exposure, oxidative stress, and repair demand. Insulin resistance worsens this environment in several ways.
- First, it affects the endothelium. The endothelium is the thin inner lining of the blood vessels. A healthy endothelium helps blood vessels relax, keeps blood flow smooth, reduces unnecessary clotting, and protects the artery wall. Insulin normally helps blood vessels make nitric oxide, a natural relaxing molecule. When insulin signalling is impaired, nitric oxide function can fall, vessels may become tighter, and blood pressure can rise. Research links insulin resistance closely with endothelial dysfunction, which is an early event in atherosclerosis.
- Second, insulin resistance changes the lipid pattern. The common pattern is high triglycerides, low HDL, and more cholesterol-carrying particles moving through the blood. Triglycerides rise because the liver is handling too much fuel and exporting more fat-rich particles. HDL often falls because the same disturbed lipid traffic increases HDL clearance. This is why the triglyceride-to-HDL ratio can be a useful practical signal of insulin resistance. A triglyceride-to-HDL ratio below 1.5 is reassuring, while higher values should raise caution.
- Third, insulin resistance increases ApoB concern. ApoB is a protein found on the surface of the main artery-risk lipoprotein particles, including LDL, VLDL, IDL and Lp(a). ApoB helps count the number of particles that can enter the artery wall. LDL cholesterol tells us how much cholesterol is inside LDL particles. ApoB tells us how many risky vehicles are on the road. Current cardiovascular literature recognises ApoB as a more precise risk marker than LDL cholesterol alone in many people, especially where insulin resistance, diabetes, high triglycerides, or metabolic syndrome are present.
- Fourth, insulin resistance drives blood pressure. This is not only about salt. High insulin can encourage the kidneys to retain sodium and fluid. Insulin resistance can reduce blood vessel relaxation. Stress hormones can tighten vessels further. Poor sleep can activate the sympathetic nervous system, which is the body’s threat-response system. Therefore, blood pressure becomes a signal of vascular, metabolic, kidney, nervous-system, and lifestyle load.
- Fifth, insulin resistance can increase clotting risk. A heart attack usually happens when a vulnerable plaque ruptures and a clot blocks blood flow. Visceral fat and inflamed fat cells can release signals that disturb clot breakdown and increase inflammatory load. Enlarged fat cells can release inflammatory signals and clot-related proteins, creating a cardiovascular-risk environment beyond cholesterol alone.
So, the real problem is not one number. It is the terrain.
The Fat Cell Is Not Just Storage
Many people still think body fat is innate stored calories. Fat tissue is an active endocrine organ. Endocrine means it releases chemical messages into the body. Healthy fat tissue stores and releases fuel intelligently. It protects the body by safely holding excess energy when needed and releasing fatty acids when insulin is low and the body needs fuel.
The problem begins when fat cells become too large, inflamed, and insulin resistant. Normally, insulin tells fat cells to stop releasing fat after a meal. This process is called inhibition of lipolysis. Lipolysis simply means breaking stored fat into fatty acids so the body can use them. When fat cells become insulin resistant, insulin can no longer properly shut down fat release. Then the body can have high insulin and high free fatty acids at the same time. That is metabolically abnormal.
This is where the liver gets into trouble. The fat cells leak fatty acids. The liver receives them. But if insulin is high, the liver is not in a strong fat-burning state. So instead of burning the fat cleanly, it stores more of it. Over time, this contributes to fatty liver. The fatty liver then produces more triglyceride-rich particles, worsening the blood lipid pattern. This is how belly fat, fatty liver, triglycerides, insulin resistance and heart risk become one connected loop.
This is also why simply eating less without correcting insulin signalling often fails long term. Hunger wins. Energy drops. Cravings rise. Muscle may be lost. The person blames willpower when the real problem is fuel access. The body has stored fuel, but insulin remains too high for the body to use that fuel efficiently.
The Food Pattern That Creates the Perfect Storm
The modern food environment is built to keep insulin high, hunger unstable, and fat storage easy.
The most damaging pattern is frequent eating of refined starch, sugar, industrial oils, processed snacks, desserts, fried foods, sweet drinks, alcohol, and calorie-dense food that arrives in combinations the body is poorly designed to handle. Refined carbohydrate raises glucose and insulin quickly. Processed fats add dense energy. Ultra-processed food bypasses normal appetite control. The result is more incoming fuel, more insulin demand, more liver burden, more triglyceride production, and more fat storage.
This is why the common advice to simply restrict calories often fails. If the food still drives hunger, glucose swings, high insulin, poor satiety, and cravings, the person can only fight biology for so long. Eventually the system pushes back.
The smarter question is not, “How do I eat less?” The smarter question is, “How do I eat in a way that lowers unnecessary insulin demand, restores satiety, protects muscle, improves liver function, and allows the body to access stored fat?”
For many insulin-resistant people, this means reducing refined carbohydrates and ultra-processed foods, prioritising protein, using natural fats intelligently, eating fewer but more complete meals, improving mineral balance, removing constant snacking, and allowing the body enough time between meals to lower insulin. In some people, a guided lower-carbohydrate or ketogenic approach can be powerful because it directly reduces insulin demand and improves fat burning. However, this must be personalised, especially in people with diabetes medication, blood pressure medication, kidney disease, gout tendency, previous cardiovascular events, or high training loads.
The method matters. Done badly, it creates stress. Done well, it creates metabolic relief.
The Markers That Show the Pattern
A functional heart-longevity assessment ask the right question: is this person metabolically safe, vascularly safe, and biologically resilient?
Fasting insulin is one of the most useful early markers because it gives insight into how hard the body is working to control fuel. Fasting insulin around 6 µIU/mL or lower is generally favourable, while high-teen values and above strongly suggest insulin resistance. Values in between require context because insulin has rhythm and can fluctuate.
Fasting glucose and HbA1c still matter, but they are not enough. Glucose shows what happened to sugar. Insulin shows the effort required to manage it. HbA1c shows an average glucose exposure over roughly three months, but it may miss large swings and it does not show insulin demand.
Triglycerides and HDL matter because they show how the liver and lipid system are handling fuel. High triglycerides with low HDL often suggest insulin resistance. The triglyceride-to-HDL ratio is not perfect, but it is practical and widely available.
ApoB matters because it estimates the number of artery-risk particles. Lp(a) matters because it is largely genetic and can increase cardiovascular risk even when other numbers look acceptable. The European Atherosclerosis Society recommends measuring Lp(a) at least once in adults and interpreting it in the context of overall cardiovascular risk.
Blood pressure matters because it shows mechanical force on the artery wall. Waist-to-height ratio matters because central fat is a strong signal of metabolic risk. Liver enzymes, especially ALT, AST and GGT, can help reveal liver stress. Uric acid can reflect metabolic and inflammatory load. hs-CRP can show broad inflammation. Resting heart rate and HRV can show nervous-system load and recovery capacity. Sleep quality shows whether the body has enough repair time. Fitness capacity shows whether the heart, muscle and mitochondria can meet demand.
The American Heart Association’s Life’s Essential 8 includes diet, physical activity, nicotine exposure, sleep, weight, blood lipids, blood glucose and blood pressure as core cardiovascular health measures, which aligns with the idea that heart risk is a whole-system pattern, not one isolated number.
The Recovery Sequence
The first step is awareness and realisation.
When the pattern is measured properly, the person stops guessing. They can see whether glucose is being controlled at the cost of high insulin. They can see whether triglycerides and HDL suggest poor fuel handling. They can see whether ApoB particle burden is high. They can see whether Lp(a) adds inherited risk. They can see whether blood pressure, waist, sleep, stress and fitness are moving in the wrong direction.
The second step is stabilisation. A stressed body does not heal well. Sleep timing, morning light, protein at each meal, walking after meals, fewer refined carbohydrates, fewer ultra-processed foods, proper hydration, mineral balance, and a calmer evening rhythm begin to lower the metabolic noise. These changes look simple, but they change the signal the body receives every day.
The third step is restoring fuel access. This means reducing unnecessary insulin demand so the body can begin to use stored fat again. It does not mean reckless restriction. It means eating in a way that gives the body protein for repair, natural fat for satiety, fibre and phytonutrients where appropriate, and fewer foods that force repeated glucose and insulin spikes. When done correctly, hunger often becomes quieter because the body can finally access its own stored energy.
The fourth step is rebuilding muscle. Muscle is a metabolic organ. It stores glucose, burns fuel, protects joints, improves insulin sensitivity, supports hormones, and gives the body reserve. After midlife, muscle is not optional. It is medicine in biological form. Strength training, done intelligently and progressively, tells the body to preserve and build the tissue that glucose needs most.
The fifth step is nervous-system regulation. If the body is living in threat mode, insulin resistance is harder to reverse. Slow breathing, longer exhalation, better sleep rhythm, walking outdoors, emotional regulation, recovery time, and boundaries around work are not soft extras. They are metabolic tools. They lower the stress chemistry that pushes glucose up and repair down.
The sixth step is monitoring response. The body must be listened to. Blood pressure, waist, glucose response, fasting insulin, triglycerides, HDL, ApoB, liver markers, sleep, energy, cravings, training response and recovery should guide the next adjustment. This is where guidance becomes powerful, because the right next step depends on what the body shows.
Why Guidance Matters
Most people struggle because they apply the wrong information at the wrong time.
One person needs carbohydrate reduction. Another needs more protein. Another needs sleep repair first. Another needs to understand why their cholesterol markers changed during weight loss or low-carbohydrate adaptation.
The internet gives tactics. The body needs sequencing.
This is why functional coaching is different from giving advice. It reads the pattern, explains the biology, prioritises the next step, measures the response, and keeps the person moving without panic or confusion. The role of the guide is not to overwhelm the client with science. It is to make the science usable.
For the working professional, this matters because time is limited and risk is real. The goal is not to become obsessed with health. The goal is to become biologically reliable again.
Closing Reflection
If the first white paper showed the long road to the sudden event, this sequel shows one of the engines under that road.
Insulin resistance is not just about sugar. It is about how the body handles energy, stores fat, burns fat, protects arteries, regulates pressure, repairs tissue, manages inflammation, and stays resilient under life pressure.
So if this feels familiar, do not turn it into fear. Turn it into direction. The body is giving information. The next step is to read it properly, act in the right order, and stop drifting through random experiments that do not move the needle.
You do not need to fix everything at once. You need to see the pattern, understand what it means for you, and begin the right sequence. That is where the road changes. That is where the body starts to believe it is safe enough to repair.
References
American Diabetes Association, 2024. ‘Cardiovascular Disease and Risk Management: Standards of Care in Diabetes—2024’. Diabetes Care, 47(Suppl. 1), pp.S179–S218. Available at: Diabetes Journals.
American Diabetes Association, 2026. Standards of Care in Diabetes. American Diabetes Association Professional Practice Committee. Available at: ADA Professional Guidelines.
American Heart Association, 2024. Life’s Essential 8. American Heart Association. Available at: American Heart Association.
Brie, A.D. et al., 2025. ‘Atherosclerosis and Insulin Resistance: Is There a Link?’ Journal review article. Available through PubMed Central.
Caturano, A. et al., 2025. ‘Cardiovascular Health in the Shadow of Diabetes and Insulin Resistance’. Journal review article. Available through PubMed Central.
De Oliveira-Gomes, D. et al., 2024. ‘Apolipoprotein B: Bridging the Gap Between Evidence and Clinical Practice’. Circulation.
Horton, W.B. et al., 2025. ‘Metabolic and Vascular Insulin Resistance’. Journal review article. Available through PubMed Central.
Kronenberg, F. et al., 2022. ‘Lipoprotein(a) in Atherosclerotic Cardiovascular Disease and Aortic Stenosis: A European Atherosclerosis Society Consensus Statement’. European Heart Journal, 43(39), pp.3925–3946.
Lloyd-Jones, D.M. et al., 2022. ‘Life’s Essential 8: Updating and Enhancing the American Heart Association’s Construct of Cardiovascular Health’. Circulation, 146(5), pp.e18–e43.Bigazzi, R. and Bianchi, S., 2007. ‘Insulin Resistance, Metabolic Syndrome and Endothelial Dysfunction’. Journal review article. Available through PubMed.
About Mathew Gomes
Functional Health, Nutrition & Longevity Coach
Many senior professionals slowly lose energy, metabolic health and resilience with age and end up managing blood pressure, cholesterol, diabetes, gut issues or chronic stress with long-term medication while the underlying loss of function continues.
Mathew Gomes is a certified Functional Health, Nutrition Practitioner (American Academy of Functional Health) and Executive Coach (ICF, EMCC) who helps professionals understand and correct the root causes behind this decline.
Using structured assessments of how seven core body systems function – energy, cardiovascular, metabolic, digestive, immune, hormonal, and nervous – Mathew translates the science of nutrition, lifestyle and recovery into a clear, practical plan integrated alongside medical care.
Doctors manage disease; meanwhile Mathew restores function – so the body works better again, dependence on medication can reduce, resilience returns, and professionals regain the energy and health to live and perform fully for the long term.
Disclaimer
This white paper is provided for educational and informational purposes only. It is not intended to diagnose, treat, cure, prevent, or provide medical advice for any disease or health condition.
The author is a Functional Health, Nutrition and Longevity Coach, not a medical doctor. The content presented reflects a functional, educational perspective on health, lifestyle, nutrition, and risk factors, and is designed to support informed self-care and productive conversations with qualified healthcare professionals. Nothing in this document should be interpreted as a substitute for medical advice, diagnosis, or treatment from a licensed physician or other qualified healthcare provider. Readers should not start, stop, or change any medication, supplement, or medical treatment without consulting their prescribing clinician.
Individual responses to nutrition, lifestyle, supplements, and coaching strategies vary. Any actions taken based on this information are done at the reader’s own discretion and responsibility. If you have a medical condition, are taking prescription medication, or have concerns about your health, you are advised to seek guidance from a licensed healthcare professional before making changes.