During the week after the shift to DST, research shows an associated rise in:
Cardiovascular disease, with a 24% higher risk of heart attacks. Injuries, including a 6% spike in fatal car accidents. Stroke rate, which increases by 8%. Mental health and cognitive issues, with an 11% spike in depressive episodes. Digestive and immune-related diseases, such as colitis, which increase by 3% in females over age 60.
Our internal clocks regulate processes including liver function, the immune system, and our body's physiology, which means any disruption can have significant effects.
According to a 2008 U.S. Department of Energy report, the energy savings from switching between daylight saving time and standard time were negligible. Daylight saving time, therefore, no longer serves us any purpose.
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