How does exercise impact calorie intake after mental tasks?

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Exercise After Mental Tasks Can Reduce Calorie Intake

New research indicates that engaging in physical activity following mentally demanding tasks may lead to a reduction in subsequent calorie consumption. A study involving 38 undergraduate students explored the effects of rest versus high-intensity interval training after a graduate-level entrance exam on appetite. Those who exercised after the exam consumed fewer calories compared to their baseline relaxation state, while those who rested ate more.
Exercise Group Consumed Fewer Calories Post-Task

Participants who underwent 15 minutes of high-intensity interval training on a treadmill after completing a graduate-level entrance exam consumed an average of 25 fewer calories than they did when they had simply relaxed before eating in a previous session. This suggests that physical exertion may play a role in moderating appetite following periods of cognitive effort.
Rest Group Showed Increased Calorie Intake

Conversely, the group that rested for 15 minutes after the mental task consumed an average of 100 calories more than their baseline relaxation state. This finding supports the idea that mental exertion itself can increase energy demands, leading to a greater desire for food.
Lactate Levels May Explain Reduced Appetite

Researchers propose that the increased lactate levels observed in the blood after exercise might have met the brain's energy requirements. This metabolic response could potentially curb the appetite that might otherwise be stimulated by the cognitive load of the mental task.
Findings Published in Scientific Journal

The study, conducted by a team from the University of Alabama at Birmingham, had its findings published in the scientific journal Medicine & Science in Sports & Exercise. The research aimed to investigate whether glucose and lactate produced through exercise could satisfy the energy needs of the brain, thereby reducing the need for food consumption.

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How does exercise impact calorie intake after mental tasks?

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