Survive the Heat in Just One Minute! Doctor's Tips for Maintaining Health - Is Drinking Water Enough? New Common Sense to Protect Yourself from Dangerous Heat

That Headache Might Not Just Be Summer Fatigue—Doctor's "1-Minute Heat Stress Countermeasures"

The summer heat is no longer something you can just "endure for a bit." The scorching heat that pricks your skin the moment you step outside, the room temperature that doesn't drop even at night, and the mornings where sleep doesn't relieve your fatigue. Many people dismiss these discomforts as "inevitable because it's summer." However, feelings of lethargy, headaches, nausea, decreased concentration, and sleepless nights might not just be discomforts but signs that your body is being overwhelmed by heat.

Sebastian Karl, a German doctor well-versed in molecular medicine, views the burden on the body from extreme heat as "heat stress" and emphasizes the importance of accumulating short-term countermeasures in daily life. The key is not to endure the heat but to detect the burden it places on the body early and change the environment and behavior to prevent body temperature from rising too much.

Heat stress doesn't only refer to severe heatstroke that causes sudden collapse. It often manifests as minor daily discomforts like mild headaches, a feeling of fuzziness, shallow sleep, decreased appetite, irritability, dizziness, and nausea. This makes it particularly troublesome. While thinking "I'm still okay," dehydration and body temperature can increase, dulling your judgment.

The first thing to remember is how to respond when you experience headaches, nausea, vomiting, severe fatigue, or dizziness. These are warnings from your body and should not be ignored. Immediately move away from the sun to a shaded or air-conditioned area. Cool your neck, forehead, armpits, and wrists with a wet towel or water. Drink water gradually. Even spraying your skin with mist and using a fan or natural breeze can help cool your body through evaporation.

These countermeasures are not elaborate. Making a wet towel, drinking a glass of water, or closing the curtains can all be done in a minute. Karl emphasizes the "1-minute strategy," which is more about cutting off the damage heat does to the body with small actions early rather than a special health method.

Ventilation on hot days also requires attention. Many people think "opening the window will cool things down," but opening windows when the outside temperature is higher than the room temperature lets hot air in. The effective method is to ventilate when the outside air is cooler than indoors, from night to early morning. Conversely, during the day, keep windows closed and block sunlight with blinds or curtains, or even external shading if possible. In heat countermeasures, "when to do it" is as important as "what to do."

There are many voices on social media about the timing of ventilation. Posts in the German-speaking area share the sentiment that "even at night, the temperature doesn't drop, and the room remains hot." Similarly, in Japan, it's not uncommon to hear that walls, floors, and furniture retain heat even at night, making it hard to sleep even with the air conditioner on. The hardship of extreme heat isn't just the direct sunlight during the day. The inability to recover at night drains your energy for the next day.

Hydration is fundamental to heat countermeasures, but sometimes "drinking only when thirsty" is too late. On hot days, you lose fluids through sweat, approaching dehydration without realizing it. Generally, during hot periods, it's recommended to drink about 2 to 3 liters a day in small amounts. However, those with heart or kidney conditions should consult a doctor instead of increasing fluid intake on their own.

Drinks should primarily be water or unsweetened tea. When sweating a lot, it's also important to replenish salt and electrolytes. In cases of heavy sweating from sports or outdoor work, it's advisable to focus on mineral replenishment as well as water. On the other hand, caution is needed when drinking alcohol or sugary drinks to beat the heat. Alcohol can promote dehydration, and while sweet drinks may be easy to consume, they don't necessarily reduce the burden on the body.

Diet is also part of heat stress countermeasures. Appetite may decrease on hot days, but if you continue without eating, recovery of strength will be delayed. The key is not to eat heavy meals all at once but to have light meals multiple times. Foods rich in water, like watermelon, cucumber, tomato, and strawberries, are suitable for summer meals. Greasy dishes or large meals can burden digestion and lead to lethargy. On hot days, it's easier to continue with "light and frequent" meals rather than "eating a lot."

Regarding exercise, it's dangerous to carry over the usual sense. Even running or strength training for health can suddenly increase the burden on the body on days with high temperatures and humidity. Especially on days with heat warnings or high perceived temperatures, it's necessary to decide to refrain from exercising. If you must exercise, choose cooler times like early morning or after sunset and reduce intensity. On days with lack of sleep, remaining fatigue, or poor health, it's most important not to overdo it.

Some might think, "Training in the heat will make you stronger." Indeed, the body can adapt to heat to some extent. However, this doesn't mean suddenly pushing yourself in extreme heat. Heat acclimatization progresses gradually by continuing light exercise before it becomes dangerously hot. In the midst of extreme heat, protecting rather than training should be prioritized.

Sleep is particularly important in heat stress countermeasures. Even if you can endure the heat during the day, your body won't recover if you can't sleep at night. Discomfort while sleeping directly affects concentration, mood, appetite, and stamina the next day. Karl also mentions cooling measures before bed, such as cold showers, wet towels, or briefly cooling pajamas before wearing them. These methods might sound a bit unusual, but they are practical in reducing discomfort at the onset of sleep.

Heat countermeasures related to sleep also gather significant interest on social media. On platforms like Instagram, posts suggest "darkening the room during the day," "ventilating at night," "using light bedding," "cooling feet," and "avoiding alcohol before bed." These overlap considerably with expert advice. In other words, the "heat hacks" discovered experientially by individuals and the heatstroke prevention measures recommended by public institutions are quite aligned.

On the other hand, the reactions on social media are also earnest. Voices like "I can't sleep even with the air conditioner on," "I wake up several times at night," "I'm already tired in the morning," and "I'm worried about children and elderly parents" indicate that extreme heat is not just a weather phenomenon but is affecting entire lifestyles. Heat discourages going out, reduces sleep, suppresses appetite, and for some, even lowers work or study efficiency. Heat stress is not only a physical issue but also a lifestyle issue.

Particular attention should be given to the elderly, infants, people with chronic illnesses, outdoor workers, pregnant individuals, and those living alone who may not notice changes in their condition. The elderly may not feel thirst as easily and may react slowly to heat. Infants have immature temperature regulation and can approach dangerous conditions more quickly than adults. People with heart, kidney, or respiratory diseases may find that heat exacerbates their symptoms.

This is why heat countermeasures cannot be completed by individuals alone. Reach out to elderly family members or neighbors. Do not leave children or pets in cars. Plan breaks and hydration into outdoor work schedules. Schools and workplaces should facilitate decisions to change plans due to heat. The voices shared on social media saying "it's hot" or "it's tough" are not just complaints but signs for society to raise its alert level against heat.

Recent studies have also suggested that long-term exposure to heatwaves may be related to biological aging. A study involving about 25,000 adults in Taiwan indicated that cumulative exposure to heatwaves is associated with accelerated biological aging. Of course, this alone cannot simply conclude that "heat inevitably ages you faster." However, it is important to note that extreme heat is being considered not just as temporary discomfort but also as a long-term health risk.

So, what should you do starting today? First, don't endure the heat. Next, don't underestimate changes in your physical condition. And incorporate 1-minute countermeasures into your life.

In the morning, check the weather forecast and heat warnings, and adjust your outing or exercise times. During the day, block sunlight with curtains or blinds to prevent indoor heat from increasing. Drink water frequently and be mindful of minerals if you sweat. Keep meals light and divided to avoid overburdening your body. When going out, choose shaded areas and use hats or parasols. If you experience headaches, nausea, or dizziness, move to a cool place immediately. At night, ventilate during cooler times, and if the bedroom is too hot, consider sleeping in the coolest part of the house.

These actions may seem mundane individually. However, on extremely hot days, these mundane accumulations protect the body. Heat stress countermeasures are not just for those with a special health consciousness. They are necessary life skills for commuters, people staying at home, those raising children, those concerned about elderly parents, outdoor workers, and athletes.

Heat cannot be dispelled by willpower. However, the way you prepare can be changed. Drink a glass of water. Place a wet towel on your neck. Change the time you open windows. Shift daytime plans to the morning. Send a quick message to family. These 1-minute actions can be the turning point in protecting your health.

In the era of extreme heat, what is needed is not the resignation of "it's inevitable because it's summer," but the mindset of "changing the way of living to adapt to the heat." To protect yourself and those around you from dangerous heat stress, start with small measures you can take today.

Source URL

Interview with Sebastian Karl. References on heat stress warning signs, ventilation, exercise, hydration, diet, and sleep countermeasures.
https://www.kreiszeitung.de/wissen/dr-karl-erklaert-diese-minuten-strategien-schuetzen-sie-vor-gefaehrlichem-hitzestress-zr-94378946.html

BIÖG "Klima Mensch Gesundheit": References on basic measures for hot days, hydration, cooling indoors, exercise, sleep, and diet.
https://www.klima-mensch-gesundheit.de/hitzeschutz/empfehlungen-bei-hitze/

German Federal Ministry of Health: References on health risks due to heat, attention-needed groups like the elderly, people with chronic illnesses, infants, and heat-related mortality.
https://www.bundesgesundheitsministerium.de/themen/praevention/hitze

Research published in Nature Climate Change: References on the relationship between long-term exposure to heatwaves and biological aging.
https://www.nature.com/articles/s41558-025-02407-w

Robert Koch-Institut's Bluesky profile: Examples of public dissemination on SNS about the impact of extreme heat on health.
https://bsky.app/profile/rki.de

Reference to Bluesky post: Example of SNS reaction about room temperature not dropping at night, causing heat to linger.
https://bsky.app/profile/did%3Aplc%3Ab74e3fdqe26mv2hizwmjs67l

Reference to Instagram post: Examples of shared measures for sleeping on hot nights, including hydration, daytime shading, nighttime ventilation, and light bedding.
https://www.instagram.com/p/DZ7vRifjPZ2/

Reference to Instagram post: Examples of "heat hacks" shared by individuals, such as cooling feet, using light bedding, and staying hydrated.
https://www.instagram.com/p/DaFeCscjY3F/