Question

This is a riddle and the answer is either a vegetable or a fruit and it’s a 4 letter word.

I'm a staple in diets, I feed half the world
I'm a pretty big deal, you may have heard
Although my grains are really small
Fill a bowl with me and you're sure to be full!

Answer 1

Im guessing it's corn.

Nice riddle by the way.

Answer 2

Rice. It feeds half the world and is an enormous staple in diets.