Where do eggs at your school come from?
Nine out of ten eggs that you eat at school have come from hens living in really bad conditions.
They're called battery hens, which means they live packed together in tiny cages, with no light and no space to spread their wings.
The research was done by a healthy food campaigning group called Sustain.
They want schools to use only eggs that have come from free-range chickens, which live better lives and can roam around in large open areas.
In 2012 it will be against the law for any country in Europe to produce eggs in battery farms.
But that won't stop eggs being shipped in from countries further away which may still use them.