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We often think of bile as simply a digestive fluid, something that helps break down fats after a meal. But emerging research is revealing a much broader role. Bile acids are not just digestive helpers; they are powerful signalling molecules that interact with the gut microbiome, influence inflammation, and may even shape brain function.

The Gut-Brain Depression Axis: How Dysbiosis Inflames Your Brain. About 90% of your body's serotonin is produced in your gut—but that serotonin doesn't travel to your brain. It stays in your gut and peripheral tissues, regulating digestion, immune function, and signalling. Your brain makes its own serotonin from tryptophan (an amino acid from protein).

7 Physiological Causes of Depression in Midlife Women (That Your Doctor Might Miss)

For years as a nutritional therapist and functional medicine practitioner, I have been talking about the mind-body connection and that...