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Nighttime Caffeine Linked to Increased Impulsivity

EL PASO COUNTY, TEXAS, AUG 5 – Females show significantly higher caffeine-induced impulsivity than males, raising concerns for shift workers and military personnel relying on nighttime caffeine, researchers said.

  • A UTEP study published in iScience reveals that nighttime caffeine consumption increases impulsive behavior in fruit flies.
  • The research team investigated nighttime caffeine effects because caffeine is widely consumed, especially by shift workers and military personnel.
  • Flies given caffeine at night showed reduced movement suppression and displayed reckless flying under normally aversive conditions, unlike daytime caffeine exposure.
  • Females exhibited greater caffeine-induced impulsivity despite similar caffeine levels, with Professor Han noting other genetic or physiological factors likely cause this sensitivity.
  • The findings suggest potential risks for nighttime caffeine consumers, especially women in health-related or military roles, and highlight the need for further mechanistic studies.
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Medical Xpress broke the news in on Tuesday, August 5, 2025.
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