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Mast cells are immune cells that play a critical role in protecting the body, but when they become chronically activated, they can contribute to widespread symptoms including gut inflammation, food sensitivities, skin reactions, fatigue, anxiety, histamine intolerance, and nervous system dysregulation. Mast cell activation is also increasingly being studied for its role in inflammatory bowel diseases (IBD), where excessive immune activation, gut dysbiosis, and inflammatory signalling can worsen intestinal inflammation and barrier dysfunction.

Research now shows that chronic stress, low thyroid function, gut permeability, mold exposure, gut dysbiosis, and other environmental toxins can all contribute to mast cell activation and immune imbalance. 

When the nervous system remains stuck in a prolonged “fight or flight” state, inflammatory signalling within the body can intensify — particularly within the gut.

Rachel’s work is deeply shaped by her own experience overcoming severe gut inflammation, nervous system dysfunction, and MCAS. Through studying the brain-gut axis, metabolism, circadian biology, thyroid health, and inflammatory signalling, she became passionate about helping others better understand the deeper mechanisms driving chronic symptoms — and supporting the body through a more holistic, root-cause approach.