Question

This is a riddle

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

bean

Step-by-step explanation:

its a vege that is 4 letters and matches the description

Answer 2

Step-by-step explanation:

Cereal!!;