Paediatricsmiddle twist
A 15-year-old girl attends a general practice with her mother, who is worried that she has stopped eating properly and has lost weight. Her mother says she has cut out bread, pasta and dairy after reading about it online, and that she runs before and after school. The girl sits quietly and answers in single words while her mother describes her meals. Her weight is 8 kg below her measurement a year ago. She has had no vomiting, abdominal pain or diarrhoea. Which one of the following should be done first?