The Disturbing Truth About How Extreme Heat Affects the Body

Extreme heat doesn't just make you uncomfortable—it triggers a cascade of physiological stress. Your heart works overtime as your body diverts blood to the skin to cool down. Dehydration accelerates. Heat exhaustion and heat stroke become serious risks, particularly for older adults, children, and people with chronic conditions. Even in healthy individuals, prolonged exposure impairs cognition and physical performance. According to io9, the severe temperatures and humidity currently affecting much of the United States underscores how vulnerable human biology is to extreme weather. Stay hydrated, seek cool shelter, and check on vulnerable people around you.

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