hello, graying of hairs are common problem and now a days seen in teenage also.
Yes, food, health can be a factor but there are other factors also which has effect on graying of hair. Genetic predisposition is also a major factor.
though there is no promising treatment available for graying of hair, but consult a dermatologist.
he/she can help you and guide you for at least further prevention of praying.
Health Tips
avoid chemicals on your hair.