Heat Waves Accelerate Aging and Pose Serious Health Risks, Experts Warn

Recent heat waves are no longer brief seasonal events but are becoming longer, more intense, and more frequent due to global climate changes. Dr. Osnat Raziel, director of the multidisciplinary obesity treatment center at Assuta Ramat Hahayal, explains that extreme heat stress affects nearly every body system, accelerating aging processes, worsening chronic diseases, and potentially causing medical emergencies.

The human body maintains a narrow temperature range, activating natural cooling mechanisms such as blood vessel dilation, increased heart rate, and sweating when external temperatures rise. However, intense heat and humidity can overwhelm these systems, leading to dehydration, low blood pressure, kidney damage, heat exhaustion, or heat stroke, which requires immediate medical attention.

Heat also impairs brain function, reducing concentration, memory, decision-making, and sleep quality, which in turn raises stress hormones and inflammation. The heart works harder to cool the body, increasing risks for people with cardiovascular conditions. Kidney function suffers due to reduced blood flow from dehydration, raising the risk of acute kidney injury and kidney stones, especially in older adults and those with preexisting kidney disease.

Vulnerable groups include the elderly, people with heart disease, diabetes, obesity, kidney or lung diseases, pregnant women, infants, and children. Certain medications, including diuretics, blood pressure drugs, psychiatric medications, and weight-loss drugs like GLP-1 agonists (semaglutide and tirzepatide), increase dehydration risk. Patients on these medications should proactively hydrate and monitor for symptoms like dizziness or reduced urine output.

Chronic stress from heat accelerates biological aging by taxing the body's repair mechanisms. Maintaining muscle mass, regular exercise, quality sleep, balanced nutrition, and metabolic health helps improve heat resilience. To safely navigate heat waves, experts recommend consistent hydration, staying in air-conditioned environments, avoiding sun exposure during peak hours, wearing light clothing, and scheduling physical activity during cooler times. Monitoring vulnerable family members daily is crucial.

Heat waves are now a permanent reality, requiring integration of heat management into preventive healthcare. Proper hydration, fitness, sleep, and metabolic health not only improve comfort during heat but also contribute to long-term healthy aging. Understanding and adapting to the body's heat response can reduce immediate complications and support health for years to come.