A surprising study of temperature-related deaths in Mexico has revealed that at higher temperatures and humidity, heat kills far more young people under 35 than those older than 50. This upends the conventional thinking that the elderly and the youngest children are most vulnerable during heat waves. The study analyzed all deaths in Mexico from 1998 to 2019.
It found that when temperatures and humidity reach uncomfortable levels, such as the mid to upper 80s Fahrenheit (around 30 degrees Celsius) and 50% relative humidity, there were nearly 32 temperature-related deaths of people under 35 for every temperature-related death of someone 50 and older. The research shows an especially surprising increase in heat-related deaths among people between 18 and 35. This age group had nine times as many temperature-related deaths as those over 50.
The study’s authors and outside experts are scrambling to understand why younger people are more affected. Two theories have been proposed: outdoor workers who cannot escape the heat and young people who do not know their limits. Jeffrey Shrader, a climate economist at Columbia University and co-author of the study, said, “We found that younger people are especially vulnerable to humid heat.
As the climate warms, we’re really going to be shifting the burden of temperature-related mortality towards younger individuals and away from older individuals who tend to be more vulnerable to cold temperatures.”
Data from cold weather shows more than 300 deaths of Mexican residents over 50 for every young person dying from cold temperatures, according to the study. Marina Romanello, executive director of the Lancet Countdown, which monitors health effects of climate change, emphasized the dangers posed by heat.
Young adults’ vulnerability to heat
“People of all ages are increasingly at risk from rising temperatures, and this study shows that those we might have considered relatively safe from heat-related adverse health outcomes might not be so,” Romanello said in an email. “Heat is a much more dangerous silent killer than most people acknowledge it to be, and that heat is increasingly putting our health and survival at risk.”
The researchers chose to examine weather-related deaths in Mexico because of the country’s detailed mortality data and a variety of climates, making it an ideal place for in-depth study. They aim to determine whether this pattern of increased young adult deaths during high heat conditions is unique to Mexico or if it occurs in other warmer regions of the globe.
Initially, the research team wanted to examine general weather-related deaths, but age differences prompted a more detailed investigation. The study used complex statistical analyses to isolate temperature fluctuations as a determining factor, explained Andrew Wilson, a Columbia climate economics researcher and study co-author. Researchers discovered that the ideal temperature for the lowest excess deaths differs by age.
Younger adults’ sweet temperature spot is about nine degrees Fahrenheit (five degrees Celsius) cooler than it is for older people, according to Shrader and Wilson. Patrick Kinney, a professor of urban health and a co-author of the study, echoed the importance of understanding these findings and their implications for public health strategies in the face of climate change. Compounding this complexity is the concept of “wet-bulb temperature,” which mirrors how the body cools itself and integrates humidity and solar radiation.
A wet-bulb globe temperature of 35 degrees Celsius (95 degrees Fahrenheit) is considered extreme, although most places do not reach that level. In conclusion, as the climate continues to warm, understanding the shifting demographics of temperature-related vulnerability will be crucial for developing effective public health policies and interventions.
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