Thanks to the research of Grill and many others, we now have a reasonably clear picture of how this happens. When you eat food, it enters your stomach and stretches it. After partially digesting the food, your stomach gradually releases it into the small intestine. Here, specialized cells in the intestinal lining detect the nutrient content of what you ate, for example, the amount of carbohydrate, fat, and protein. These stretch and nutrient signals are relayed to the brain, primarily via the vagus nerve, which plays a major role in bidirectional gut-brain communication (see figure 39). At the
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i need to read a review of harvey grill's researc.
