My 14-year-old daughter recently became a vegetarian after a visit to a farm with her school. Her classmates shared stories of how animals are killed, and she chose to stop eating meat for ethical reasons. She has also been sleeping more than usual during the summer holidays, waking up very late in the mornings. How can we help her eat healthy? Are the long sleep times and change in diet related?

K.F., Hastings on Hudson, NY, USA.