Do you allow if your kid doesn’t want to eat breakfast before going to school?

My kids don't go to school yet, but when times comes that they'll be going to school already, I won't allow them to go out without breakfast. I've experienced it when I was in grade 4, when I was too stubborn to eat breakfast because I started to be conscious about my body. I almost fainted coz I'm not used to having an empty stomach. I don't want that to happen to them.