My last one did. I was the last session of his day usually, starting around 5PM. It was not unusual for him to grab a snack at the beginning of our session (and he often shared with me - in fact, he showed me where the office break room was so I could stop there for something on my way back if I wanted). It didn't bother me a bit. I drink something all day while I teach to keep my voice going and just to stay hydrated so I don't lose focus. By 5PM, if I hadn't had anything since lunch, I'd need something myself or I'd probably fall asleep.