I've had all this;
Gong affects:
Here is a list of all the Gong of Wonder's powers I have experienced:
Gong grants wisdom (Makes the villager who rang the bell, be a master at a skill).
Gong grants food
Gong grants tech points (I think)
Gong taken away health (not to sure about this).
Gong grants technology
Gong grants health
Gong grants luck