Don't Shop Right After You Run a Marathon

January 24, 2026 - 20:00

A new study reveals that the mental fatigue following a marathon could make you a less savvy shopper. Research focused on trained female athletes found that the intense physical and cognitive effort of racing 26.2 miles significantly reduces executive function.

Executive function is our brain's command center, governing crucial skills like self-control, decision-making, and impulse regulation. The study indicates that this vital cognitive resource is notably depleted immediately after marathon completion. This state of mental depletion is linked to both the acute energy drain of the race itself and the longer-term energy balance of the athlete.

In practical terms, this means judgment may be impaired and the cognitive effort required for careful choices is heightened. The findings suggest that making significant financial decisions or indulging in retail therapy right after crossing the finish line might not be ideal. An impaired ability to weigh options, resist marketing, or stick to a budget could lead to regrettable purchases.

The research underscores that marathon running is not just a physical test but a substantial mental challenge, with effects that linger well after the body stops moving. For athletes, the advice is clear: celebrate your achievement, but perhaps save the major decisions—and the shopping trips—for after you've properly recovered.