When you sit down to tuck into your lunch it's mostly things high in salt, sugar or fat that you'll be eating.
Only one lunchbox in every five is healthy enough to meet the standards the government have come up with.
Fewer than half of the lunches contained a piece of fruit.
The Food Standards Agency says kids often have more say than their parents in choosing what goes in their lunchboxes.
They added: "Small changes to what children eat now can have a big impact on their diet and health in the future."
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