wondering if you should bring high sugar content food like doughnuts or a candy for the 15 minute break during your DAT, you might have to think twice after watching this video by George Wolfe: Oscillations in Hormone levels.. he discusses how eating a doughnut (cookies, candies...) could lead to maladaptive responses by the body with cyclic periods of active mode followed by rest mode (yawning) due to high fluctuations in the level of hormones: insulin and glucagon.