For most of the 20th century, bacteria was the enemy. Once scientists identified microorganisms as the cause of infectious disease, every effort was made to thwart these invisible invaders.
But in the last 20 years or so, scientists have developed a new respect for bacteria, and the paradigm is turning from a strategy of war, to one of co-existence. Science now considers a robust, diverse bacterial colony to be essential to good health.
In a sense, we’re actually more bacteria than human. The human body contains 10 times more bacterial cells than human cells. Nearly all of our bacteria—about three pounds—lives in our gut. Scientists call this internal bacterial colony our microbiome.
Regular exercise also played a role in students’ mental state, but not as much as fermented foods. The study concluded that fermented foods “may have a protective effect against social anxiety symptoms for those at higher genetic risk.” While additional research is needed, these results suggest that eating probiotic foods “may serve as a low-risk intervention for reducing social anxiety.”
Gut-Brain Connection
Microbiome Diet
Kellman’s prescription for brain health begins with what you eat. His protocol is outlined in his book, “The Microbiome Diet.”
As diets go, Kellman’s is fairly easy to follow. It doesn’t restrict calories, protein, fat, or carbs. The hardest part is the first few weeks when foods like sugar, dairy, and gluten get shelved in an effort to heal the gut wall. But Kellman claims that people don’t typically experience cravings.
Comfort Food
Inulin is found in many vegetables, such as asparagus, jicama, onions, and garlic. Herbal roots, such as chicory, dandelion, and burdock, contain even higher concentrations of this fiber. Inulin supplements are usually made from Jerusalem artichokes.
You’ve heard of probiotics. Inulin is often referred to as a prebiotic. Unlike acidophilis supplements, which support a single strain of gut bacteria, inulin fiber feeds the hundreds of beneficial bacterial strains found in a healthy gut. And Kellman says it’s bacterial diversity that keeps the microbiome strong.
“An unhealthy, less diverse microbiome can contribute towards systemic inflammation,” Kellman said. “A lack of diversity can be a factor in autoimmune disorders, including lupus, arthritis, asthma, colitis, and inflammatory bowel disease.”
While most people focus on probiotics to nourish their microbiome, Kellman says prebiotics are a better bet. Individual probiotic supplements can be used to target specific issues, but prebiotic supplements are good for general gut flora wellness.
“I think most people are taking probiotics aimlessly, without a real understanding,” Kellman said. “They’re not getting a good bang for their buck. They’re better off with the prebiotics.”
Brain Benefits
A stronger microbiome means less inflammation, which means reduced risk of inflammatory brain diseases like Alzheimer’s and Parkinson’s.When it comes to treating mood disorders, foods that strengthen the microbiome work much differently than psychotropic drugs.
“By improving the microbiome we can actually see positive changes in mood, cognitive function, and executive function,” Kellman said.
“It’s not just eliminating the poor mood—the depression or anxiety—but it’s actually creating positive emotions and a positive mood. This feeling of optimism and empowerment is quite common on the microbiome diet. You don’t see that effect with the anti-depressants.”
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