Four in ten teachers say they are seeing children arriving to school hungry every day.
A survey of 211 teachers at primary and secondary level found 78% of teachers say children are hungry in their classroom at least once a week.
The Kellogg Ireland research shows more than half of teachers say the number of hungry children in their class has increased over the past year.
Shane Loftus, Principal of Our Lady Immaculate School in Darndale in Dublin, says it's becoming a massive worry for principals.
"We would have seen this for a long time but now just talking to colleagues working in what you could refer to as more affluent areas they're now seeing this coming through threw in there as well.
"So people are often call me saying and what do you do in your school, how does it work in your school and looking for advice maybe on how to alleviate the problem in their schools now as well."
