This summer has left repeated scenes: empty squares at the time of the nap, nights in the heat and a Mediterranean turned into a pressure pot. Spain has suffered suffocating days They will go to statistics, but the most serious is not measured in degrees. According to a recent study, heat waves do not leave when the temperature drops. They leave a silent trail in the body: they accelerate biological aging.
A disturbing finding. A recent study Posted in Nature Climate Change It has shown that repeated exposure to heat waves accelerates biological aging. The work, led by the University of Hong Kong, followed 25,000 people for 15 years in Taiwan.
The results speak for themselves: four extra days of heat wave in a period of two years were translated in nine days added to the biological age of the participants. In manual workers, more exposed to the sun and heat, that effect shot up to 33 days. “The impact of heat on our body is comparable to tobacco, alcohol, poor diet or lack of exercise,” The research team has summarized to The Guardian.
The biological clock under pressure. How did they get to that conclusion? The scientists calculated the biological age from different markers: blood pressure, inflammation, cholesterol and the functioning of lungs, liver and kidneys. When comparing them with the real age of each person, the conclusion was clear: who had spent more time under heat waves showed accelerated aging.
The exact reason is still unknown. The main hypothesis is that high temperatures damage DNA and submit the body to constant stress. “If the exhibition accumulates for decades, the impact on health will be much greater than we have now measured,” has pointed to The Guardian Dr. Cui Guo, main author of the study.
More evidence: heat at all ages. This finding does not come alone. In 2024, another job Posted in Nature He revealed that early exposure to cold and heat interferes with the development of the white matter of the brain in children. The consequences, the authors warned, could extend throughout life.
The conclusion is clear: heat does not understand ages. Inference affects developing brains; In adulthood, it accelerates the organism’s wear.
Can the damage be stopped? The same study offers an interesting nuance: the harmful effect seemed to be reduced over time, probably because people learn to protect themselves better. Searching for shadow, hydrating or using air conditioning made a certain difference. Even so, the biological footprint never disappeared completely.
The problem is that not everyone has the same possibilities to adapt. Older people, outdoor workers or those who live in neighborhoods with less resources suffer a much greater impact, As the study collects.
Prevention, experts coincide, goes through reinforcing Urban design: More trees, more shadow, better isolated homes and just access to cooling. Individually, recommendations remain simple but effective: hydrate, avoid hours of heat and seek refuge in fresh places.
The invisible heat scar. Until now we thought about heat as something passenger: annoying, exhausting and dangerous in extreme days. But scientific evidence points to something more disturbing. The heat, the experts say, does not leave at all when the thermometer goes down: it stays inside, accelerating the wear of the organism and leaving an invisible scar.
For researchers, this finding is a turn in the way of understanding health. And the warning is clear: if the planet continues to heat up, we will not only have longer summers, also bodies that age faster.
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