Right from the get go with Zeus he was only allowed to eat when I gave him the go ahead, now 3 years later it can almost be annoying because I have to tell him a half dozen times to eat.
I remember one morning I put his food out and was in a hurry to get going and told him like 3-4 times but he must have sensed the annoyance in my voice because he didn't go right for it, finally just went "I gotta go I don't have time for this" I came home at 5pm and his food was still there.