Nicolas has been in a gang for many years. Which health problem is he at risk of developing? excess weight gain
O post-traumatic stress disorder
sleep apnea
type 2 diabetes

PTSD post traumatic stress disorder

Explanation:

This is due to the events that may occur when in the gang. Shootings or other traumatic events may have adverse effects on him later in life that may be hard to overcome.

obviously, the latter.