Heat Can Age You As Much As Smoking, a New Study Finds

Prolonged exposure to extreme heat accelerates biological aging in older adults, increasing the risk of age-related illnesses, according to research published in Science Advances.

In a nationally representative study of 3,686 U.S. adults over age 56, scientists found that long-term exposure to high heat days was associated with accelerated epigenetic aging - molecular changes that affect how genes function without altering DNA itself.

Researchers from the University of Southern California discovered that individuals living in areas where heat index values regularly exceed 90F showed signs of being biologically older than those in cooler regions, even after controlling for factors like wealth, education, and lifestyle habits. Six-year cumulative heat exposure linked to as much as 2.48 years of accelerated aging in one measurement.

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