Eating on the Run

While de-cluttering and organizing his desk, this 4th grader ignored his left arm/hand and even turned the left side of his body away from the front of his desk.  What to do???

Since he works a little on his desk, then munches a little on his lunch, I asked him to put his left hand on the desktop while he chewed.  I would have preferred that he place his hand a little more forward on the desk surface, but I was happy with this position (for now...).  This seemed to help him orient his body more squarely to the desk, at least for a little while.