Is depression a kind of allergic reaction?

A growing number of scientists are suggesting that depression is a result of inflammation caused by the body's immune system Barely a week goes by without a celebrity "opening up" about their "battle with depression". This, apparently, is a brave thing to do because, despite all efforts to get rid of the stigma around depression, it is still seen as some kind of mental and emotional weakness. But what if was nothing of the sort? What if it was a physical illness that just happens to make people...