[lutusp]

> No, all it shows is that there is a physical component - and probably for only some people.

In science, the word "probably" is best left behind.

> It is hardly the same as something like diabetes.

But that's just the point -- until we know what causes depression, as scientists we should not arbitrarily assume anything. The recent findings point to a physical, biological cause. The fact that psychiatrists and psychologists cannot treat depression points in the same direction. Or didn't you know that? Studies of psychological depression treatments and drugs have yet to reach statistical significance.