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 would find it difficult to find happiness in even good food.

Everyone has heard the story of the person who toils under great hardship and still manages to find joy in life. That's sort of the opposite of depression and it isn't necessarily good. People who are content to toil in hardship might find it difficult to motivate themselves to change their situation. It's a balance between the internal and external. Even the definition of what is good food is malleable. The chef or food critic might be repulsed by Taco Bell while someone else might enjoy every bite.