My students for 'Sports Nutrition' could vary between GPs and nutritionists to the young swimmer new to competitive swimming. I expect to split the class between swimmers and parents/guardians, and by age and by default, within reason, educational attainment. Talking to primary school swimmers will be different to college and secondary school students - especially those with a science A level.
Simply offering further reading is one approach. I also have papers on 'compliance' and the vital role of the parent/guardian to changing behaviours so that they are aligned with what a competitive club would expect.