Will

I'm sorry I don't mean to offend but I don't really understand what you're getting at here. I tried Googleing some key phrases (like "low vibrations cause depression") and all I could find was stuff the likes of which can be found on this sight https://raiseyourvibrationtoday.com/. Is this the kinda stuff you were talking about?
Also, what does the salt/sugar test involve?
 
I always find it hard to describe metal, I would start with something like "fast" or "aggressive" but when you include those criteria, doom metal is no longer metal. 
I would say generally, metal music is a form of hard rock music that often is less blues orientated and features loud distorted guitars, but that description is vague enough to include a lot of punk and grunge.
 
Wikipedia characterises metal "Heavy metal is traditionally characterized by loud distorted guitars, emphatic rhythms, dense bass-and-drum sound, and vigorous vocals. Metal subgenres variously emphasize, alter, or omit one or more of these attributes." 
But yet again this can be applied to punk just as easily.