Chemical imbalances do not exist; dying brain cells do

Researchers have never been fully confident in the chemical imbalance theory, yet the media continue to purport it as fact. Dr. John Grohol over at PsychCentral recently wrote:

We’ve all heard the theory — a chemical imbalance in your brain causes depression.

Although researchers have known for years this not to be the case, some drug companies continue to repeat this simplistic and misleading claim in their marketing and advertising materials. Why the FTC or some other federal agency doesn’t crack down on this intentional misleading information is beyond me. Most researchers now believe depression is not caused by a chemical imbalance in the brain.

How did we come to this conclusion? Through years of additional research. But now some are jumping on the next brain bandwagon of belief — that depression is caused by a problem in the brain neuronal network.

Grohol cites Jonah Lehrer's article in the Boston Globe in which he posits that researchers now think depression comes from "brain cells shrinking and dying." Lehrer writes:

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