Hydration and Heart Health: Why Drinking Water Matters

September 29 is World Heart Day, a day dedicated to raising awareness about cardiovascular health and encouraging people to take steps to protect their hearts.

When people think about heart health, certain recommendations usually come to mind: eat a balanced diet, exercise regularly, don't smoke, maintain a healthy weight, and know your blood pressure and cholesterol numbers.

All of these are important.

But there is another everyday habit that deserves a place in the conversation: staying hydrated.

Water is essential to life, and adequate hydration helps the body function normally. It also has a direct connection to the cardiovascular system. According to the American Heart Association, staying hydrated helps the heart pump blood more easily through the body.

That doesn't mean drinking more water can prevent or treat heart disease. It can't. Instead, hydration should be viewed as one small but important part of an overall heart-healthy lifestyle.

This World Heart Day, it's worth looking at something many of us reach for every day but may not think much about: a glass of water.

What Is World Heart Day?

World Heart Day is observed every year on September 29 and is led by the World Heart Federation to raise awareness about cardiovascular disease and the importance of cardiovascular health.

Heart disease remains a major public health concern. The Centers for Disease Control and Prevention (CDC) identifies high blood pressure, high cholesterol, smoking, diabetes, physical inactivity, unhealthy eating, obesity, excessive alcohol use, age, and family history among factors associated with heart disease risk.

Some risk factors cannot be changed. Your age and family history, for example, are not choices.

But everyday behaviors can be changed. That is where heart health becomes personal.

• • The foods you choose.
  • How much you move.
  • Whether you smoke.
  • How much sodium and added sugar you consume.
  • Whether you keep up with preventive healthcare.
  • Whether you give your body enough fluid to stay properly hydrated.

How Does Hydration Affect Heart Health?

Your heart pumps blood continuously through your circulatory system. Blood carries oxygen and nutrients to tissues throughout your body and helps transport waste products away.

Water is an essential component of the body's fluids, so maintaining adequate hydration is important for normal physiological function.

The American Heart Association explains that staying hydrated helps the heart pump blood more easily through the body.

This becomes especially important when your body is losing more fluid than usual. Several factors can contribute to dehydration:

• • Hot weather.
  • Heavy sweating.
  • Vomiting or diarrhea.

All can increase your need for fluids. Water needs vary depending on factors including age, sex, activity level, pregnancy and breastfeeding status, while the American Heart Association points out that climate and exercise also affect how much fluid a person needs.

The important distinction: Hydration supports normal body function.

It does not mean that drinking extra water will prevent a heart attack, lower cholesterol, clear blocked arteries, or cure heart disease. Those claims go beyond the evidence. A heart-healthy lifestyle requires a much broader approach.

What Happens When You Become Dehydrated?

Dehydration occurs when the body loses more water than it takes in.

Mild dehydration can cause symptoms such as thirst, fatigue, headache, dizziness, and changes in how you feel. More serious dehydration can become dangerous and may contribute to heat-related illness.

The cardiovascular system is one reason dehydration deserves attention. The American Heart Association explains that dehydration can make the heart work harder, while adequate hydration helps the heart pump blood more easily.

This is particularly relevant during periods of extreme heat.

In September 2026, the American Heart Association again emphasized hydration as part of protecting cardiovascular health during hot weather, noting that adequate fluid intake helps the heart pump blood throughout the body.

Signs that you may need more fluids can include:

• • Thirst
  • Fatigue
  • Headache
  • Dizziness
  • Feeling overheated
  • Dark or concentrated urine

Severe dehydration can be a medical emergency. If you have symptoms that are severe, persistent, or concerning, seek appropriate medical care rather than trying to correct the problem simply by drinking more water.

How Much Water Should You Drink?

This is where one of the most common hydration myths comes into play.

You've probably heard that everyone needs exactly eight glasses of water every day. There isn't one universal amount that is right for everyone. Fluid requirements vary from person to person.

Your needs can change based on:

• • Age
  • Body size
  • Activity level
  • Climate
  • How much you sweat
  • Illness
  • Pregnancy or breastfeeding
  • Certain medications and medical conditions

The National Academies established adequate intake values for total water, which includes water from drinking water, other beverages, and food. These values are based on observed intake patterns in generally healthy populations. The commonly cited values are approximately 2.7 liters per day for women and 3.7 liters for men, but these figures represent total water intake, not a requirement to drink that much plain water.

That's an important distinction. Fruits and vegetables, soups, milk, and other foods and beverages can contribute to total fluid intake. For most people, the practical takeaway is simple:

Drink water regularly throughout the day and pay attention to your body's fluid needs.

If you have a medical condition that requires you to limit or carefully manage fluid intake, follow the guidance of your healthcare professional.

Water Is a Simple Alternative to Sugary Drinks

There's another reason water deserves a place in a heart-conscious lifestyle.

What you drink matters. Water contains no calories or added sugar. Replacing sugary beverages with plain water can reduce calorie and added-sugar intake. The CDC recommends choosing water instead of sugary drinks as part of healthier beverage choices.

Sugary beverages include more than soda. They can include:

• • Sweetened tea
  • Fruit drinks
  • Energy drinks
  • Sports drinks
  • Sweetened coffee beverages
  • Other beverages with added sugars

The CDC identifies sugary drinks as a major source of added sugars in the American diet and notes that frequent consumption is associated with several health concerns, including heart disease.

Choosing water doesn't have to be complicated. It can simply mean replacing one sugary drink with water today. Then doing it again tomorrow.

Don't Forget About Sodium

When discussing water and heart health, there is another everyday factor worth understanding: sodium. Your body needs sodium, but consuming too much can contribute to higher blood pressure.

The CDC notes that limiting sodium can help lower blood pressure, an important consideration because high blood pressure is a major risk factor for heart disease. This is why heart health cannot be reduced to one nutrient, one food, or one beverage.

A glass of water doesn't cancel out a high-sodium diet. Likewise, drinking plenty of water doesn't eliminate the cardiovascular risks associated with smoking, physical inactivity, high cholesterol, uncontrolled blood pressure, or diabetes.

Heart health is about the whole picture.

The Bigger Heart-Health Picture

If you want to use World Heart Day as a reason to pay more attention to your cardiovascular health, start with the basics.

None of these habits work in isolation. Together, they form the foundation of a healthier lifestyle.

Why Drinking Water Quality Matters

Once you decide to make water your primary beverage, another question naturally follows:

Do you know what's in your drinking water?

In the United States, public water systems are regulated under the Safe Drinking Water Act, and community water systems provide annual Consumer Confidence Reports describing the quality of the water they supply.

That report can be a useful starting point for understanding your local drinking water. It can tell you about contaminants that were detected, how those levels compare with applicable standards, and where your water comes from.

If you want additional treatment at home, the right approach is to identify the contaminants of concern and then look for a filtration system that is independently certified for those specific contaminants.

Not every filter removes every contaminant. That distinction matters.

Where Does Water Filtration Fit In?

Water filtration and heart health are related only in a very limited sense. Filtered water should not be marketed as a way to prevent heart disease.

The more straightforward benefit is this: if you prefer the taste or quality of filtered water, having convenient access to it at home may make it easier to choose water throughout the day.

That's where a drinking water system such as a Multipure system can fit into a healthy household routine.

Multipure offers NSF-certified drinking water filtration systems designed to address specific contaminants, with filtration claims and certifications varying by model.

The important thing is to choose a system based on the contaminants you want to reduce and the certifications that verify the applicable claims.

Water filtration is about water quality. Heart health is about much more.

Keeping those two things in their proper perspective makes the conversation more useful, and more trustworthy.

A Simple World Heart Day Challenge

This September 29, consider making hydration one small part of your World Heart Day routine.

Try any of the following:

• • Start your morning with water.
  • Keep a reusable water bottle nearby during the day.
  • Choose water instead of a sugary drink when you can.
  • Drink regularly rather than waiting until you're extremely thirsty.
  • Drink more when you're exercising or spending time in hot weather.
  • Take a few minutes to think about your bigger heart-health picture.

Questions to know:

1. 1. Do you know your blood pressure?
   2. Do you know your cholesterol numbers?
   3. Are you getting regular physical activity?
   4. Are you watching your sodium and added sugar intake?
   5. Are you making water your primary beverage?

These are simple questions, but they can help turn World Heart Day into something more meaningful than a date on the calendar.

Make Water Part of Your Heart-Healthy Routine

Your heart works every minute of every day. Taking care of it isn't about finding one miracle food, one supplement, or one health trick. It's about the everyday choices that add up over time.

• • Eat well.
  • Move your body.
  • Don't smoke.
  • Know your numbers.
  • Manage your health conditions.
  • Get preventive care.
  • Stay appropriately hydrated.

Water isn't a cure for heart disease. But adequate hydration is an important part of keeping your body functioning normally, and your heart is part of that equation.

This World Heart Day, it is worth looking at something many of us reach for every day but may not think much about: a glass of water.

Sometimes a healthier routine begins with something very simple:

Fill the glass. Drink the water. Take care of your heart.