We rarely appreciate hydration until the summer heat reminds us how quickly we can lose it.  

Water has always been at the center of life. It’s abundant in nature, essential to every living organism, and so fundamental to human health that our bodies are composed of more water than almost anything else. We instinctively reach for water when thirsty because it’s exactly what our bodies need. 

The body’s reliance on water becomes even clearer when compared to food. While humans can survive for weeks without eating under certain conditions, going without water for even a few days can quickly become dangerous. [1] That’s because water supports countless bodily functions that must occur continuously. 

US dietitian and CNN contributor Lisa Drayer says, “Water regulates our body temperature, keeps our joints lubricated, and helps prevent infections and delivers nutrients to our cells.” She adds, “Our kidneys and liver work hard to get rid of toxins in our bodies, and they depend on water to do their job.” 

That’s why hydration remains one of the cornerstones of health and wellness. But while water should always be your primary source of hydration, there are times, particularly during the heat of summer and intense workout sessions, when hydration becomes a little more nuanced. 

Sweating & Summer 

Sweating or perspiration is one of the body’s most effective cooling mechanisms. As temperatures rise, be it from heat, physical activity, or both, your body produces sweat to help regulate its core temperature. [2] 

This process is normal but only to a certain degree. As sweat losses increase, so does the risk of dehydration, which occurs when the body sheds more fluids than it takes in. And unfortunately, summer can accelerate this process, as higher temperatures and humidity can often lead to extreme sweating. 

When fluid losses begin to outpace intake, dehydration can set in, increasing the risk of fatigue, reduced performance, and heat-related illness. Part of the reason is that sweat doesn’t contain just water. As the body cools itself, it also loses important electrolytes that help regulate optimal bodily processes. 

Electrolytes 

Electrolytes are minerals that help the body function properly by carrying electrical signals throughout the body. Key electrolytes include: 

Sodium is typically the electrolyte lost in the greatest amounts through sweat, [4] though other electrolytes, such as potassium, magnesium, calcium, and chloride are also depleted to varying degrees. 

As these losses accumulate, the body may have a harder time maintaining proper fluid balance and supporting normal nerve and muscle function. This is one reason why excessive sweating is often accompanied by symptoms such as: 

Thirst: A Late Signal of Dehydration 

Many people rely on thirst as their cue to drink water, but thirst isn’t always the most proactive indicator of hydration status. By the time you feel noticeably thirsty, your body has often already begun to experience mild dehydration. [5] 

This can become particularly problematic during the summer months. Heat, humidity, and physical activity can accelerate fluid losses, sometimes faster than thirst signals can keep pace. As a result, waiting until you’re thirsty to reach for a drink may allow dehydration to gradually develop, especially during prolonged activities or intense exercise. 

The “Chugging Water” Problem 

Once thirst finally sets in, the natural response is to chug as much water as possible as quickly as possible, which, according to scientists is not really the best way to rehydrate. [6] 

This can trigger a body mechanism, somehow shocking the mouth and throat sensors when sudden influx of water is detected. This prompts the body to increase urine production, a process known as diuresis. As a result, a larger proportion of that water may be excreted rather than retained and used for hydration. 

For this reason, Lindsay Baker, PhD, a senior principal scientist at the Gatorade Sports Science Institute says, “In general, it’s best to sip a little bit throughout the day,” because “sudden ingestion of large amounts of plain water by itself generally just ends up being eliminated.” [6] 

Urine As A Reliable Indicator 

Unlike thirst, urine provides a more direct reflection of how the body is managing its fluid balance. This is because the kidneys are constantly adjusting how much water is retained or excreted based on the body’s hydration needs. 

One way to assess hydration is by observing urine color. In an interview with CNN Health, Douglas Casa, CEO of the University of Connecticut’s Korey Stringer Institute says, “The morning is the best time to get a global sense of your hydration status.” “If your urine looks more like an apple juice instead of lemonade, then you’re dehydrated. On the flip side, the need to urinate throughout the day is a sign that you’re well-hydrated.” 

Smart Hydration 

Water is undeniably the foundation of hydration. But what happens when summer places demands on the body that water alone may struggle to meet? 

A long run under the summer sun, an afternoon of yard work, a strenuous workout, or a day spent outdoors can result in significant losses of both water and electrolytes. In these situations, hydration becomes less about simply drinking more and more water and more about replacing what the body is actually losing through smarter ways. 

Electrolyte-Rich Fluid and Food 

One of the simplest ways to replace electrolytes lost through sweat is through food and fluids. Many everyday foods and beverages naturally contain electrolytes such as sodium, potassium, magnesium, and calcium, making them an effective first line of defense against summer-related electrolyte depletion. 

In the same CNN interview, Drayer says, “I often remind people that broth-based soup, as well as other beverages including tea, coffee and milk, count towards your daily fluid intake… Also vegetables including cucumbers, lettuce, celery and tomatoes and fruits including watermelon, cantaloupe and strawberries.” 

Targeted Hydration Supplements 

While water and whole foods should form the foundation of any hydration plan, electrolyte supplements can also provide a concentrated source of the minerals most commonly lost through sweat. 

For active individuals, athletes, and anyone experiencing substantial sweat losses, targeted hydration formulas, such as such as Sunwarrior's Active Hydration, deliver a concentrated source of the electrolytes most commonly lost through sweat. By supplying key minerals that support fluid balance, muscle function, and nerve signaling, these supplements can help replenish key electrolytes, support immune health with antioxidant vitamin C, and help fight the fatigue that comes with dehydration. 

Hydration is More Than Just Water 

Our bodies are remarkably good at adapting to the environment around us, but they still rely on us to provide the resources they need. The same hydration routine that feels enough on a mild spring day may fall short when temperatures climb over the summer, so it's worth rethinking what your body actually needs at that precise time. Oftentimes, the difference between merely getting through the heat and feeling your best in it comes down to what and how you choose to replenish. 

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References 

Other References 

https://edition.cnn.com/2017/09/27/health/benefits-of-water-and-fluids/index.html 

https://hsph.harvard.edu/news/the-importance-of-hydration/ 

https://nutritionsource.hsph.harvard.edu/healthy-drinks/