Answer:
Depression
Explanation:
Due to the fact that he is still a child, a traumatic experience like what he is going through with his grandfather, can bring on a wave of mixed emotions. Now when children dont know how to deal with it they usually fall into depression, this can lead to anxiety stress and even forms of self hate. He is not showing signs of being physically ill. But being disengaged is a key symptom to being mentally ill.
Muscular endurance. muscular= muscles, endurance= working something for long periods of time w/o getting tired.
heart diseases if u exercise every day u lower your chances of having if exercise every your likely not to get it
diabetes if u eat healthy and not eat as much sugar to not diabetes
coner cancer if u exercise and not be stress u prevent this buy not having stress or exercise to prevent maybe do hobby u love
high blood pressure this comes by being in stress like coner cancer u prevent by not being stress do something to relieve you (don't do smoke beer or do something illegal tho) maybe a hobby or sport or hang out with your friends