NOV. 12, ‘25 // WITH TEHILA (WIDENBAUM) KAPLAN, INHC Digestion Begins in the Mouth When most people begin working on their gut health, the focus usually goes straight to what to add or what to remove. Maybe it looks like changing foods, adding probiotics, trying digestive enzymes, incorporating fermented foods, or experimenting with elimination diets. These tools can absolutely be helpful but there is a foundational step that comes before all of them. A step that determines whether those foods and supplements will actually be digested and used by the body in the first place. Digestion begins in the mouth. Not in the stomach, not in the intestines, and not in the colon. Long before food ever reaches the digestive tract, a cascade of chemical, neurological, and hormonal responses has already started. These early signals, happening before the first bite is swallowed, determine how smoothly or poorly the entire digestive process will unfold. This step is so basic, so ordinary, that it is often overlooked entirely. Yet it can be the missing link for people who “eat healthy” but still struggle with bloating, gas, constipation, reflux, sluggish digestion, nutrient deficiencies, or fatigue after meals. Understanding the mouth’s role in digestion can change how you eat and how you feel profoundly, without requiring drastic diet changes or new supplements. Digestion Begins Before You Swallow Digestion starts with anticipation. When you see, smell, or think about food, your brain communicates with your digestive organs to prepare for what’s coming. This is known as the cephalic phase of digestion, and it triggers the release of saliva, gastric acid, digestive enzymes, and bile. Research estimates that up to 30% of digestive secretions are initiated in this phase, meaning that nearly a third of your digestive process depends on your mindset and environment while eating. This alone explains why digestion can feel effortless during slow, relaxed meals shared with others, and why it can feel heavy, incomplete, or uncomfortable when eating quickly in the car, scrolling your phone, or standing in the kitchen between tasks. The body needs to feel safe in order to digest. If we’re stressed, overwhelmed, rushing, or distracted, we are operating in a sympathetic nervous state often referred to as “fight or flight mode.” In that state, digestion is deprioritized. Blood flow shifts away from the digestive organs and toward the muscles. Stomach acid, digestive enzymes, and bile production slow dramatically. Even the healthiest meal can ferment, sit heavy, or cause discomfort when eaten in this physiological state. This is why the conversation around gut health must begin with the nervous system. You can be eating perfectly and still digest poorly if your body doesn’t have the chance to prepare. 172
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