Extreme Heat Speeds Up Biological Aging, New Studies Show

Extreme heat doesn’t just make people uncomfortable — new research shows it can speed up the aging process inside our bodies.

Scientists studying the effects of rising temperatures have found that people who experience prolonged exposure to high heat are likely to see their biological age — a measure of how well cells and tissues function — increase more quickly. Unlike chronological age, biological age reflects the toll environmental stress takes on the body.

A study published earlier this year analyzed more than 3,600 older Americans and linked frequent extreme heat days to faster aging. Those exposed to 140 or more days per year with a heat index over 90 degrees aged as much as 14 months faster than those with fewer than 10 such days. The impact was comparable to smoking or heavy drinking.

Heat stress forces the body to work harder to stay cool, damaging cells and triggering long-term effects. Other studies in Germany and Kenya found similar results, with heat-related stress affecting even unborn children.

Experts say that while everyone is vulnerable, women and people with conditions such as diabetes or obesity face greater risks.

The findings highlight the need to adapt as heat waves become longer and more frequent. Staying cool, adjusting activity schedules, improving nutrition, and maintaining fitness are recommended ways to slow this form of cellular damage.

As global temperatures rise, scientists stress that understanding the health effects of extreme heat will be vital in protecting future generations.

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