Logging food and drink shows exactly what your child is really eating rather than what you think they're eating, and points up any glaring gaps. Print this grub log chart, stick it on the fridge and get them to write down everything that passes their lips for a week.

Once you've completed the record, take a good look:

 How much healthy and unhealthy food is on there? Occasional junk meals or snacks won't hurt them, but 'occasional' means once or twice a week, not every day, or, even worse, several times a day. The balance should lean strongly towards healthy options.

 Are they getting their five portions of fruit and vegetables every day?

 Do they drink plain water several times a day?

 Where could you make simple changes to give get them eating more healthily?