What Happens When You Don't Drink Enough Water? 10 Hidden Effects on Your Body

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  1. What happens to your blood when you become dehydrated? Blood contains: Red blood cells. White blood cells. Platelets. Plasma, which is mostly water. Proteins, electrolytes, nutrients and other substances. When the body loses too much water, plasma volume can decrease. This can cause hemoconcentration, meaning some substances in the blood appear more concentrated. Possible effects include: Increased blood viscosity under some circumstances. Reduced circulating blood volume. Increased strain on the cardiovascular system. Reduced blood flow to organs in severe dehydration. This is different from having excessive cholesterol or fatty deposits in arteries. NCBI+2 2. Does dehydration increase cholesterol readings? This is where our article can become particularly interesting. A small human study involving 15 healthy participants found that fasting without fluid replacement produced higher measured total cholesterol, LDL cholesterol and HDL cholesterol than fasting with water and sal...
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How Does High Blood Sugar Affect Your Heart and Blood Vessels?

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High blood sugar is often associated with diabetes, but its effects go far beyond thirst, frequent urination, or feeling tired. When blood sugar remains too high over a long period, it can damage blood vessels, increase the risk of heart disease, and affect circulation throughout the body.

The good news is that understanding these risks and taking practical steps can help protect your heart and blood vessels.

1. How Does High Blood Sugar Damage Blood Vessels?

Blood carries oxygen and nutrients to every part of the body through a network of blood vessels. When glucose levels remain high for a long time, they can damage the lining of these vessels and contribute to inflammation.

Over time, this damage can make it easier for fatty deposits, known as plaque, to build up inside arteries. The arteries may become narrower and less flexible, reducing the amount of blood that can flow through them.

This process is called atherosclerosis, or the hardening and narrowing of the arteries. It is one of the major reasons people with diabetes face a higher risk of cardiovascular disease.

2. Why Does High Blood Sugar Increase the Risk of Heart Disease?

Your heart needs a steady supply of oxygen-rich blood to function properly. When the arteries supplying the heart become narrowed or blocked, the heart muscle may not receive enough oxygen.

This can lead to coronary artery disease and increase the risk of a heart attack.

People with diabetes also commonly experience other risk factors, including high blood pressure, unhealthy cholesterol levels, and high triglycerides. When these conditions occur together, the risk to heart health can increase further.

According to the US Centers for Disease Control and Prevention, people with diabetes are about twice as likely to develop heart disease as people without diabetes.

3. Can High Blood Sugar Increase the Risk of Stroke?

Yes. High blood sugar associated with diabetes can damage blood vessels throughout the body, including those supplying the brain.

A stroke can occur when a blood vessel supplying the brain becomes blocked or when a blood vessel ruptures and causes bleeding. Diabetes increases the risk of stroke, particularly when blood sugar problems occur alongside high blood pressure, unhealthy cholesterol levels, or smoking.

Recognising the warning signs is essential. Sudden weakness or numbness on one side of the body, difficulty speaking, sudden vision problems, or a sudden severe headache may indicate a medical emergency.

Seek emergency medical care immediately if these symptoms occur. Do not wait to see whether they disappear.

4. How Can High Blood Sugar Affect Circulation?

The effects of diabetes are not limited to the heart and brain. Blood vessels supplying the legs and feet can also become narrowed, a condition known as peripheral artery disease.

Reduced circulation may cause:

  • Pain or cramping in the legs when walking.

  • Feet that feel unusually cold or appear pale.

  • Cuts or sores that heal slowly.

  • Increased risk of foot infections and other complications.

Diabetes can also damage nerves, making it harder to notice an injury. This is why people with diabetes should check their feet regularly and seek medical advice about wounds that do not heal.

5. Can Someone Have Heart Problems Without Obvious Symptoms?

Yes. Some people with diabetes may have cardiovascular disease without recognising clear warning signs.

Diabetes-related nerve damage can sometimes affect how pain is perceived, and heart problems do not always cause the classic symptom of severe chest pain.

Possible warning signs of a heart attack include chest pressure or discomfort, shortness of breath, cold sweating, nausea, or discomfort in the arms, back, neck, jaw, or stomach.

Symptoms can vary from person to person. If you suspect a heart attack, call your local emergency number immediately. In Malaysia, call 999.

Regular health checks are important even when you feel well. Your healthcare professional can assess your blood sugar, blood pressure, cholesterol, kidney function, and overall cardiovascular risk.

6. What Can You Do to Protect Your Heart and Blood Vessels?

Although diabetes increases cardiovascular risk, there are practical ways to reduce that risk.

Choose balanced meals. Eat more vegetables, whole fruits, whole grains, beans, and suitable sources of protein. Limit sugary drinks, frequent sweets, and heavily processed foods. Pay attention to portion sizes rather than assuming that all carbohydrates must be avoided.

Stay physically active. Walking, cycling, swimming, and other suitable activities can help improve blood sugar management and cardiovascular fitness. Choose activities that match your health and physical ability, and consult a healthcare professional if you have existing heart problems or exercise-related symptoms.

Monitor your blood sugar. Follow your healthcare professional's advice on glucose monitoring and HbA1c testing. HbA1c provides an estimate of average blood sugar over approximately two to three months.

Manage blood pressure and cholesterol. These are important parts of protecting the heart. Your doctor can advise on appropriate targets and whether medication is needed.

Avoid smoking. Smoking damages blood vessels and increases cardiovascular risk. Quitting can improve your health, even if you have smoked for many years.

Take prescribed medicines as directed. Do not stop insulin, diabetes medication, blood pressure medication, or cholesterol-lowering medication without discussing it with your healthcare professional.

7. Small Daily Habits Can Make a Difference

Protecting your heart does not require changing your entire lifestyle overnight. Start with manageable habits: drink water instead of sugary beverages more often, take regular walks if appropriate, eat balanced meals, get enough sleep, and attend scheduled medical appointments.

These actions work best when combined with an individual treatment plan. There is no single blood sugar target or diet that is suitable for everyone, so discuss your needs with your healthcare professional.

Take Care of Your Blood Sugar, Take Care of Your Heart

High blood sugar over time can damage blood vessels, contribute to narrowed arteries, and increase the risk of heart disease, stroke, and poor circulation. These complications can develop gradually, sometimes without obvious symptoms.

The encouraging news is that managing blood sugar, blood pressure, and cholesterol can help reduce the risk of complications. Healthy eating, suitable physical activity, avoiding smoking, and regular medical care all play important roles.

Your heart deserves attention before warning signs appear. By taking small, consistent steps and working with your healthcare team, you can help protect your blood vessels and support better long-term health.

Health disclaimer: This article is for general educational purposes only and does not replace professional medical advice, diagnosis, or treatment.

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