But kids seem to want to keep hold of the less healthy snacks, as hardly any said they got rid of crisps or biscuits.
Dr Ian Campbell, from the National Obesity Forum wasn't surprised.
He said kids weren't eating healthier snacks because they thought their friends would laugh at them.
Parents don't know
He also said that the food you eat at school is a very important part of your diet, so you should try to eat more healthy things.
262 parents were also asked about their children's eating habits, and most of them didn't think that their kids were throwing anything away.