I think calling something a disease, or as with obesity in america, an epidemic, serves to alarm people and local governments and does a lot more good than harm.

Also, I don't know what root cause you're looking for beyond correcting the imbalances in serotonin, norepinephrine and dopamine.

I'm not sure if fixing the modern world's tendency towards crowding, emotional isolation, biologically toxic environments and stress is really in the jurisdiction of my physician.