[krageon]

Not all depression is attributable to environmental factors. If it is, the environmental factors is what a psychologist looks at with you. If it's not, you use some sort of medication to solve it. Reducing every kind of thing that you can get medication for that isn't entirely physical to a "mental disorder" is both dismissive and kind of insulting, which really doesn't help the point you're trying to make here.

Which appears to be that some random book has all the answers that somehow nobody else has really figured out. Oh, and there's an app!