Training Room Snacks

So I was off walking around the building this morning (with a goal in mind, not just wandering aimlessly) and I happened to glance into the Training Room as I walked by. They were preparing for their 8am training class and had plates of snacks at each spot. My brief glance noted that the plates were full of small bags of M&Ms, mini candy bars, and other junk food. Is the goal to keep people awake or to give them a sugar coma so it's easier to fall asleep? Why does the food in a corporate environment nearly always have to be garbage?