Dehydration Risk Increases as Temperatures Rise: Expert Shares What To Do

When extreme heat strikes, our body works overtime to stay cool. With a rise in temperature across the country, thermoregulation becomes a significant physical challenge. The body maintains its core temperature primarily through sweating, which rapidly accelerates the loss of bodily fluids and essential electrolytes. If you aren't proactively replacing these fluids, your risk of dehydration skyrockets. Dehydration is far more than just feeling parched, and is a serious medical condition that can quickly strain the kidneys, trigger cardiovascular stress, and severely impair cognitive function.

In an exclusive interaction with the editorial team of Onlymyhealth, our expert, Dr Pooja Pillai, Consultant - Internal Medicine, Aster CMI Hospital, Bangalore, explains why dehydration risk increases as temperatures rise, and what to do to stay healthy. Read ahead to find out.

Signs of Dehydration

Thirst is a delayed physiological indicator. This means that by the time the thirst mechanism is triggered, you are often already mildly dehydrated. Some potential symptoms progress rapidly in extreme heat, including:

• Mild to Moderate Symptoms: Dark-coloured urine, dry mouth, muscle cramps, and sudden fatigue or lethargy.
• Severe Symptoms that Require Immediate Medical Attention: Extreme dizziness, confusion, an inability to sweat despite high temperatures, rapid heart rate, and fainting.

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Dehydration Prevention and Management

“Preventing heat-related dehydration requires a proactive, structured approach rather than reactive fluid consumption,” says Dr Pillai. Here’s what she recommends:

Pre-hydrate and Maintain

Do not wait for thirst. Consume water continuously throughout the day. While baseline fluid requirements vary, being exposed to high temperatures necessitates a significant increase in hourly water intake.

Prioritise Electrolyte

According to the Journal of Nutrition, sweating depletes critical minerals, particularly sodium, potassium, and magnesium. If you are outdoors or physically active in the heat, ensure to consume Oral Rehydration Solutions (ORS) or electrolyte-infused fluids to maintain cellular osmotic balance.

Utilise Water-Dense Foods

“Hydration is not limited to liquids,” Dr Pillai notes. Incorporate foods with high water content, such as cucumbers, tomatoes, melons, and citrus fruits, to naturally supplement fluid intake.

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Avoid Physiological Diuretics

Restrict the consumption of alcohol and highly caffeinated beverages during heatwaves, as these substances increase urine output and actively accelerate fluid depletion that may lead to dehydration.

Bottomline

As the temperature rises, our body loses water and important minerals way too fast. Proactive, consistent fluid and electrolyte consumption is non-negotiable during this time for maintaining core body temperature and systemic organ function. Experts warn that failing to do so may lead to severe dehydration, and symptoms may escalate to severe dizziness, rapid heartbeat, or the end of sweating, which is a medical emergency that requires immediate intervention.