Hi
I understand your concerns. There is no literature relating to more sickness during
puberty. Most probable reason for the sickness would be more exposure to daily out door activity and untimely activity. Along with they have growing demand for nutrition. More consumption of junk food which have little nutritional value. Please find a cause with his daily life activity and she should be all right.
Hope you find the answer useful. Feel free to ask any more questions.
thanking you
dr Samir