Diabetes is often considered a condition that primarily affects blood sugar levels. However, its impact extends far beyond glucose regulation. Persistently high blood sugar can gradually damage blood vessels, affect circulation and increase the risk of serious cardiovascular complications, including heart attacks and strokes.
People living with diabetes are at a significantly higher risk of developing heart disease than those without the condition. What makes this particularly concerning is that cardiovascular complications may develop silently over several years, sometimes before a person experiences noticeable symptoms.
According to the US Centers for Disease Control and Prevention (CDC), adults with diabetes are nearly twice as likely to have heart disease or a stroke as adults without diabetes. This highlights the close relationship between blood sugar management and cardiovascular health.
But how exactly does diabetes affect the heart? Why does high blood sugar increase the risk of blocked arteries and heart attacks? And what can people with diabetes do to protect their cardiovascular health?
How does diabetes increase the risk of heart disease?
To understand the connection between diabetes and heart disease, it is important to understand what happens inside the body when blood sugar levels remain elevated.
When a person has diabetes, their body either does not produce enough insulin or cannot use insulin effectively. Insulin is a hormone that helps glucose move from the bloodstream into cells, where it is used for energy.
When insulin function is impaired, glucose accumulates in the bloodstream. Over time, persistently elevated blood sugar can damage the lining of blood vessels and contribute to inflammation, oxidative stress and other metabolic changes.
These changes can accelerate atherosclerosis, a condition in which fatty deposits, cholesterol and other substances accumulate inside artery walls.
As the arteries become narrower and less flexible, blood flow to vital organs, including the heart, can become restricted.
If a plaque ruptures, a blood clot may form and suddenly block blood flow to the heart muscle. This can cause a heart attack.
In other words, diabetes does not simply affect blood sugar levels. It can also create conditions that make the cardiovascular system more vulnerable to damage.
Why are people with diabetes more vulnerable to heart attacks?
The increased risk of heart disease in people with diabetes is not caused by high blood sugar alone. Several interconnected changes in the body can contribute to cardiovascular damage. Here are five important reasons why diabetes can increase the risk of a heart attack.
1. High blood sugar damages blood vessels
Persistently elevated blood glucose can damage the inner lining of blood vessels, making them more vulnerable to inflammation and plaque formation. Over time, fatty deposits can accumulate inside the arteries, restricting the flow of oxygen-rich blood to the heart.
This condition, known as coronary artery disease, is one of the leading causes of heart attacks. The longer a person lives with poorly controlled diabetes, the greater the potential for blood vessel damage and cardiovascular complications.
2. Diabetes can accelerate plaque buildup in arteries
People with diabetes are more likely to experience abnormal cholesterol levels, including:
- Higher levels of LDL (bad) cholesterol.
- Lower levels of HDL (good) cholesterol.
- Elevated triglycerides.
These changes can promote the accumulation of fatty deposits inside artery walls. As plaque builds up, arteries become narrower and less flexible. If a plaque ruptures, a blood clot may form and block blood flow to the heart, potentially triggering a heart attack.
3. High blood pressure puts additional strain on the heart
Diabetes and high blood pressure frequently occur together. When blood pressure remains elevated, the heart has to work harder to pump blood throughout the body. This can damage artery walls and increase the likelihood of cardiovascular complications.
When diabetes and hypertension coexist, their combined effects can significantly increase the risk of heart attacks and strokes. People with diabetes should therefore monitor their blood pressure regularly and follow their doctor’s recommendations for managing it.
4. Diabetes can damage the nerves that control the heart
Long-term high blood sugar can damage nerves throughout the body, including those involved in regulating heart rate and blood vessel function. This condition is known as diabetic autonomic neuropathy.
When the nerves responsible for controlling the cardiovascular system are affected, a person may experience abnormalities in heart rate, blood pressure regulation and other cardiovascular functions.
Nerve damage can also interfere with the body’s ability to recognise certain warning signs of a heart attack, potentially making the condition harder to identify.
5. Insulin resistance contributes to multiple cardiovascular risk factors
Insulin resistance occurs when the body’s cells do not respond effectively to insulin. It is commonly associated with type 2 diabetes and may occur alongside abdominal obesity, high triglycerides, low HDL cholesterol and elevated blood pressure.
Together, these metabolic abnormalities can create an environment that increases the risk of atherosclerosis and cardiovascular disease. This is why managing diabetes requires more than simply keeping blood glucose levels within the recommended range. Blood pressure, cholesterol, kidney health and body weight also deserve attention.
Can diabetes cause a silent heart attack?
Yes. People with diabetes may experience a heart attack with mild, unusual or even unrecognised symptoms. This is sometimes referred to as a silent heart attack. One possible reason is diabetic autonomic neuropathy, which can affect the nerves responsible for transmitting pain signals from the heart.
As a result, a person may not experience the typical severe chest pain commonly associated with a heart attack. Instead, they may experience:
- Unusual fatigue or weakness.
- Breathlessness, even during routine activities.
- Mild discomfort in the chest, back, jaw or arms.
- Nausea or dizziness.
- Unexplained sweating.
- A feeling of indigestion or discomfort in the upper abdomen.
However, not every person with diabetes experiences atypical heart attack symptoms, and chest pain remains an important warning sign.
A crucial point: The absence of severe chest pain does not rule out a heart attack. If you suspect one, seek emergency medical care immediately rather than waiting for symptoms to become more obvious. NIDDK+2
7 heart attack warning signs people with diabetes should never ignore
Recognising the symptoms of a heart attack can be particularly important for people living with diabetes. Watch out for the following warning signs:
- Chest discomfort: Pressure, squeezing, tightness, heaviness or pain in the centre of the chest.
- Shortness of breath: Difficulty breathing, even without significant physical exertion.
- Pain spreading to other areas: Discomfort that travels to the arms, shoulders, back, neck or jaw.
- Unusual sweating: Sudden cold sweats without an obvious reason.
- Nausea or vomiting: Unexplained nausea, sometimes accompanied by abdominal discomfort.
- Dizziness or light-headedness: Feeling faint, weak or suddenly unsteady.
- Unusual fatigue: Sudden or overwhelming tiredness that is different from normal exhaustion.
These symptoms may occur together or individually. Some people experience mild symptoms, while others develop severe chest discomfort.
If you suspect a heart attack, call emergency services immediately (112 in India). Do not drive yourself to the hospital or delay seeking help to see whether the symptoms improve.
Who with diabetes is at a higher risk of a heart attack?
Although diabetes itself increases cardiovascular risk, certain additional health conditions and lifestyle factors can make the risk considerably higher.
You may be particularly vulnerable if you:
- Have had diabetes for several years.
- Have poorly controlled blood glucose levels.
- Have high blood pressure.
- Have elevated LDL cholesterol or triglycerides.
- Smoke or use tobacco products.
- Have excess abdominal fat or obesity.
- Lead a sedentary lifestyle.
- Have chronic kidney disease.
- Have a family history of premature heart disease.
- Have previously experienced a heart attack, stroke or other cardiovascular condition.
The combination of diabetes, hypertension, abnormal cholesterol and smoking can be especially harmful to cardiovascular health.
How can people with diabetes reduce their risk of heart disease?
A diabetes diagnosis does not mean that a heart attack is inevitable. Appropriate medical treatment, regular monitoring and sustainable lifestyle changes can help reduce cardiovascular risk. Here are some important steps to consider.
1. Keep your blood sugar levels under control
Regularly monitor your blood glucose levels and HbA1c as recommended by your healthcare professional. Take prescribed diabetes medications consistently and do not change or discontinue treatment without medical advice. Better glucose management can help reduce the risk of long-term complications, although cardiovascular risk also depends on other health factors.
2. Monitor blood pressure and cholesterol
Blood pressure and cholesterol management are essential components of cardiovascular risk reduction. Ask your doctor about regular blood pressure checks and lipid profile testing. Depending on your age, medical history and cardiovascular risk, your doctor may recommend medications such as statins to lower LDL cholesterol. Do not start or stop these medicines independently.
3. Follow a heart-healthy diet
Your daily food choices can influence both blood sugar levels and cardiovascular health.
Include:
- Green leafy vegetables and other fibre-rich vegetables.
- Whole grains and millets.
- Pulses, beans and legumes.
- Nuts and seeds in appropriate portions.
- Fish or other lean protein sources.
- Healthy unsaturated fats.
Limit excess salt, added sugar, refined carbohydrates, processed foods and foods high in saturated and trans fats. For people in India, a balanced eating pattern can include dal, vegetables, whole grains, curd and appropriate portions of rice or roti.
4. Exercise regularly
Physical activity helps improve insulin sensitivity, supports blood pressure management and contributes to better cardiovascular health. Aim for at least 150 minutes of moderate-intensity physical activity every week, if medically appropriate.
Brisk walking, cycling, swimming and other suitable aerobic activities can be helpful. People with existing heart conditions or diabetes-related complications should consult their doctor before beginning a new exercise programme.
5. Stop smoking and avoid tobacco
Smoking damages blood vessels, increases inflammation and contributes to plaque formation. When combined with diabetes, smoking can substantially increase cardiovascular risk. Quitting tobacco is one of the most important steps you can take to protect your heart.
6. Get regular heart and kidney health assessments
People living with diabetes should not focus exclusively on blood sugar monitoring. Depending on their individual risk profile, doctors may recommend:
- HbA1c testing.
- Blood pressure monitoring.
- Lipid profile testing.
- Kidney function tests, including estimated glomerular filtration rate (eGFR).
- Urine albumin-to-creatinine ratio (UACR).
- Cardiovascular evaluation when symptoms or clinical findings indicate a need.
Regular follow-ups help identify complications early and allow doctors to adjust treatment when necessary.
Can controlling diabetes reduce the risk of a heart attack?
Yes. Managing diabetes effectively can help lower the risk of cardiovascular complications. However, controlling blood sugar alone may not be sufficient. A comprehensive approach should also address blood pressure, cholesterol, smoking, physical activity, body weight and kidney health.
The American Heart Association recognises diabetes as a major controllable risk factor for cardiovascular disease. It also emphasises that people with type 2 diabetes can remain at increased cardiovascular risk even when their blood glucose is well managed.
Remember: Diabetes is not just a blood sugar disorder. It is a metabolic condition that can affect the heart, blood vessels, kidneys and nerves.
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