Oh, thanks for the further communication. I now understand your angle. "Will" means "in my opinion, if you don't eat something now, you will be hungry. That's to be expected of all human beings (considering the times lapse between now and your next meal). That's my judgment. I think you will be hungry.". The speaker is very certain that it will be so. Simple future tense. "Would" is much more tentative. Much less certain. You may or may not get hungry. It seems better that you should eat something now. So both are correct, but they say slightly different things.

Where do you think the problem may be? Why are you worried about this sentence?

Is there any problem?

you should eat proper food.