Two Year 7 pupils keep a video diary to discover more about diet Megan has a fairly balanced diet. Ryan does not. Food Technology teacher Joanna Postlethwaite sets them both a task: to keep a food video diary for 24 hours. They record their eating habits, at school and at home, with interesting results. Jo uses the diaries to explore with Megan’s and Ryan’s Year 7 classmates what teenagers need to eat to maintain a healthy diet.