Risk of high blood pressure increases.
Answer:
Because he should learn to love himself, because it is important to love yourself before starting to love others.
Explanation:
You're answer would be B. puberty, because puberty is what transforms all of your child-like traits and characteristics to adult-like ones, like when boys' voices change from high-pitched to adult low pitched.
I hope I helped! =D
I believe the answer is a psychiatrist.