While is true depression can be caused by other factors like a problem with the thyroid, most depression is cause by a unloving/dysfunctional childhood.
Also It might be because of circumstances, money worries and such.

I don't know how a doctor could prevent depression.
Most doctors are decent people trying to do the best they can with the knowledge they've got.

Eating healthy won't cure depression (tho it's always a good idea)
Healthy eating won't cure genetic MI problems either.
The doctors I've seen have not pushed pills and rarely give out benzos.
Seems to be different in US.

Good point made about people pushing natural remedies, they can be quacks with no medical training out to make as much money as they can, not necessarily any different from 'big pharma'

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