Maintain a meal schedule and try to stick to it. Generally, if you are hungry, they are probably hungry.
That said, if you offer your LO food and they dont want to eat, serve them the first few bites. Sometimes they will begin to eat after they have tasted the food. If not, wait 30 minutes and try again. You may also have to offer them something different to eat. Finger foods are easiest.
Never force them to eat.