Recent research is showing that depression is an allergic reaction to inflammation. 1
Researchers name a host of possibilities ranging from infections, such as the flu, to diets high in sugar and trans fats, to bullying and loneliness. In my case, the suspect is painfully obvious: carbohydrates composed of carbon, hydrogen, and oxygen … a.k.a the legal white powder that is a hidden ingredient in most of our foods.2
The answer to that seems to be yes, and the best candidate so far is inflammation – a part of the immune system that acts as a burglar alarm to close wounds and call other parts of the immune system into action. A family of proteins called cytokines sets off inflammation in the body, and switches the brain into sickness mode. 3
Other experts go a step further and promote the idea that the inflammatory state underlying depression may be caused by a pathogen such as a parasite, bacterium, or virus.4
This seems far-fetched, but I can find nothing to refute any of these claims. Is depression truly caused by an 'allergic reaction', or 'inflammation'? Or is this a gross oversimplification/plain not true?