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Dehydration's Link to Stroke and Heart Attack

July 16, 2023

Dehydration's Hidden Link to Stroke and Heart Attack


Water is essential for the proper functioning of our bodies. It plays a crucial role in maintaining our overall health and well-being. However, many of us fail to recognize the significance of hydration and the potential risks associated with dehydration. In this blog post, we will shed light on a hidden danger – how dehydration puts people at risk for stroke and heart attack.


Understanding Dehydration

Dehydration occurs when our bodies lose more fluids than we consume, leading to an imbalance in the body's water content. It can be caused by various factors, including excessive sweating, insufficient fluid intake, diarrhea, vomiting, or certain medical conditions. When the body lacks adequate hydration, it struggles to carry out its normal functions, impacting multiple systems and organs.


The Connection to Stroke and Heart Attack


Increased Blood Viscosity: When dehydrated, the blood becomes thicker and more viscous. This increased viscosity can hinder blood flow through the arteries, making it harder for the heart to pump blood efficiently. As a result, the heart has to work harder, increasing the risk of high blood pressure, a major contributing factor to stroke and heart attack.


Elevated Blood Pressure: Dehydration triggers the body's stress response, leading to the release of stress hormones such as cortisol. These hormones cause blood vessels to constrict, resulting in elevated blood pressure. High blood pressure can damage the arteries over time, leading to atherosclerosis (hardening of the arteries) and increasing the likelihood of stroke and heart attack.


Impaired Blood Flow and Oxygen Supply: Dehydration reduces the volume of blood circulating through the body, limiting the amount of oxygen delivered to vital organs, including the brain and heart. Insufficient oxygen supply can result in tissue damage, making these organs more susceptible to stroke and heart attack.


Increased Blood Clotting Risk: Dehydration can lead to an imbalance in the body's electrolyte levels, specifically sodium and potassium. This imbalance affects blood clotting mechanisms, making the blood more prone to clot formation. Blood clots can block arteries supplying the heart or brain, triggering a heart attack or stroke.


Prevention and Hydration Tips

Preventing dehydration is key to reducing the risk of stroke and heart attack. Here are some essential hydration tips:


  • Drink Sufficient Water: Aim to drink at least eight glasses (64 ounces) of water per day. Increase your intake during hot weather, physical activity, or when experiencing illness that causes fluid loss.
  • Monitor Your Urine Color: Pay attention to the color of your urine; pale yellow or clear urine indicates proper hydration, while dark yellow or amber-colored urine suggests dehydration.
  • Be Mindful of Caffeine and Alcohol Intake: Both caffeine and alcohol act as diuretics, increasing fluid loss. Limit their consumption, especially when you are already dehydrated or in hot environments.
  • Eat Water-Rich Foods: Include fruits and vegetables with high water content, such as watermelon, cucumbers, strawberries, and leafy greens, in your diet.
  • Hydrate Before, During, and After Exercise: Drink water before, during, and after physical activity to replenish fluids lost through sweat.
  • Pay Attention to Medications: Some medications, like diuretics and certain blood pressure medications, can increase urine output and contribute to dehydration. Consult your healthcare provider if you have concerns.


Dehydration is a serious health concern that should not be taken lightly. Its connection to stroke and heart attack underscores the importance of proper hydration for maintaining cardiovascular health. By staying hydrated and being mindful of fluid intake, we can reduce the risk of these life-threatening events. Remember, drinking enough water is not just a matter of quenching your thirst; it's a vital step towards protecting your heart and brain health. Stay hydrated, stay healthy!


We've got a free book on Nutrition and Disease. Get your free copy here: Courses & Books | Superior Physical Therapy (thesuperiortherapy.com)

Mayo Clinic has more great information on the adverse effects of dehydration on their website here: Can dehydration lead to serious complications? - Mayo Clinic News Network


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