Possible Clues:

• Grace periods?
• When to make me smile at cook?
• Lunch hours, e.g
• 8, 12 and 6, say
• Lunch at noon and dinner at 5pm and, of course, it's against the clock!
• When lunch and dinner are served
• When one has to eat, eat! Me slim? Unlikely!
• That's when they come as a matter of course