I often have a breakfast smoothie in the morning (not perfect, but convenient and it gets some nutrients in me), but I sometimes notice an energy dip after having it, which especially affects concentration at work. This also occurs (to a slightly lesser degree) if I have milk/Carnation instant breakfast as well for a quick breakfast. Is there a nutritional mechanism that causes this?
1 yogurt (either Liberte which is pretty sugary, or Activia greek flavored yogurt)
4 ice cubes