Every time I read something like this I always think they have the causality backward which I think that anyone who has ever suffered from depression can attest to. The food doesn't make you happy, you're predisposed to finding happiness. You wouldn't say that bad food makes you unhappy would you? Disappointed maybe but under normal circumstances it wouldn't cause unhappiness. If you were depressed it might, and you…
I've experienced death of loved ones, loss of job, homelessness, mountains of debt, abuse and I've experienced a huge range of emotions through all of that - yet, I've never attributed it to depression.
Most people I know who express they suffer from depression actually suffer from anger.. (and for valid reasons)