" Thayer (1986), for example, has shown numerous times that moderate exercise—such as a brisk 10-minute walk—tends to increase subjective energy and, to a lesser extent, decrease tension for up to 2 hours after the exercise has been completed. Eating a small sugar snack, on the other hand, is associated with significantly higher tension just 30 minutes after the snack has been eaten. And although energy increases and tiredness decreases initially after the snack, both then reverse directions later so that by 2 hours after the snack, energy has decreased and tiredness increased beyond what they were to begin with "

― , Character Strengths and Virtues: A Handbook and Classification