To say "I'm hungry" in Engpsh, you can say "I'm hungry" or "I need to eat." To say "I want to eat," you can say "I want to eat" or "I'm ready for lunch/dinner."

Here are some examples:

"I'm starving. Can we go get something to eat?"
"I think it's time for dinner. Are you ready to eat?"
"I'm not feepng well. I think I just need to have a snack."
"I'm getting hungry. Do you want to go out for lunch?"