I DON'T BUY THIS:

Kachur explained that there are "good" bacteria, like Bifidiobacterium and Lactobacillus, that are present in yogurt. They produce a happy signal called GABA, which acts on the nervous system to curb depressive symptoms and anxiety.

Meanwhile, "bad" bacteria like the Clostridium family, of botulism fame, live in our guts and dine on our Western diets of high fat, high sugar and processed foods, Kachur said. She added that these bacteria can produce toxins that are released into the bloodstream and could affect the brain.

For more than a year I've been on a doctor-supervised diet of no fiber, no dairy products, which means pretty big amounts of fat and sugar, and have never been in such a better mood... Of course, that may just be precisely because I'm nuts…