"Addressing poor GUT flora and improving friendly bacteria with probiotics and naturally fermented foods can actually help your body manufacture more of the healthy mood improving amino acids that you need. For example, the probiotic Lactobacillus rhamnosus was found to have a marked effect on GABA levels in certain brain regions and lowered the stress-induced hormone corticosterone, resulting in reduced anxiety- and depression-related behavior. Adding a high quality probiotic in addition to eating foods like yogurt, kefir is a good idea.
The importance of re-establishing proper GUT flora and digestion cannot be over emphasized! This is because bacterial overgrowth’s and over production of yeasts can amplify the effects of depression. Interestingly many people who have depression, anxiety or other mood disorders are highly likely to have yeast overgrowth and or food intolerance’s. Certainly anyone with IBS, Crohn’s or ulcerative colitis needs to establish and maintain a healthy flora."
Is the food you eat fueling your depression? A look at the second brain | Nourish Holistic Nutrition: