Why Fiber May Be One of the Most Important Nutrients for Your Brain
Dr. David Perlmutter
When people think about brain health, they often focus on omega-3 fats, antioxidants, exercise, sleep, or cognitive training. All of these matter. But there is another factor that deserves far more attention than it typically receives: dietary fiber.
I first explored the remarkable connection between dietary fiber, the gut microbiome, and brain health in Brain Maker,(opens in new tab) published in 2015. At the time, the idea that microbes living in the gut could influence mood, cognition, and the risk for Alzheimer’s disease was considered a novel concept. Over the past decade, however, the science has evolved dramatically. Today, we understand that dietary fiber may influence one of the most important players in brain health: the microglial cell which makes up the brain’s innate immune system.
In Brain Defenders,(opens in new tab) microglia take center stage because they represent the brain’s primary immune cells. These cells constantly survey the brain’s environment, removing debris, clearing damaged proteins, supporting repair, and helping maintain healthy neural function. When functioning appropriately, microglia are among the brain’s greatest defenders. But when they become chronically activated, they can drive inflammation, neuronal dysfunction, and degeneration.
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