Here is an article by Dr. Mercola that we wanted to pass on.  With all the problems and side-effects (like violence & suicide) around the taking of anti-depressants.  He has some great data on the cause of depression due to diet.

Here is his article:

• Depression is the leading cause of ill health and disability worldwide, affecting an estimated 322 million people globally, including more than 16 million Americans, 6 million of whom are seniors
• Research shows nutrition is a crucial factor in depression, and researchers have suggested diet is an important yet overlooked aspect of psychiatry
• Recent research found seniors who followed the DASH diet were 11 percent less likely to develop depression over the following six years, whereas those following a standard Western diet had the highest rates of depression
• Other studies have shown that unprocessed foods, especially fermented foods, help optimize your gut microbiome, thereby supporting optimal mental health, whereas sugar, wheat (gluten) and processed foods have been linked to a greater risk for depression, anxiety and even suicide
• Your gut communicates to your brain via your vagus nerve and the stress pathway in your endocrine system, and by producing mood-boosting neurotransmitters. These links help explain why your gut health has such a significant impact on your mental health