A poll of 5000 parents in the UK has found more than a third lack the knowledge needed to make their children a healthy school lunch.
The National Health Service say a child's lunch should be based on carbohydrates like bread, potatoes, rice or pasta and include fresh fruit and vegetables, a source of protein, a sugar-free drink and a side like a low fat-low sugar yoghurt.
The BBC Good Food survey found 36 per cent of UK parents were unaware of these guidelines.
It found 26 per cent of parents in the North East and Cumbria areas followed the guidelines compared with 58 per cent of Londoners.
More than half of parents who are aware of the guidelines said they only followed them occasionally, with almost 10 per cent admitting to packing leftovers - including last night's takeaway - for their children's lunch.