There were more but they weren't discovered as they were not viral and treatment was unknown and research were not done.
That isn’t a very descriptive question because people have different reasons for liking sports
That substance would be cathartic
Appetite is not linked to hunger since appetite is the activity and drive in order to eat whereas hunger is the physical and mental state in which a person needs to eat.
Also appetite is linked to many unhealthy behaviors that can result to other symptoms of eating disorders which causes deletrious effects on one's mental and biological state.
