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Gustatory and visceral stimulation from food regulates digestion and nutrient use. Free L-glutamate (Glu) release from digested protein is responsible for umami taste perception in the gut. Moreover, monosodium Glu (MSG) is widely used as a flavor enhancer to add umami taste in various cuisines. Recent studies indicate that dietary Glu sensors and their signal transduction system exist in both gut mucosa and taste cells. Oral Glu sensing has been well studied. In this review, we focus on the role of Glu on digestion and absorption of food. Infusion of Glu into the stomach and intestine increase afferent nerve activity of the gastric and the celiac branches of the vagus nerve, respectively. Luminal Glu also evokes efferent nerve activation of the abdominal vagus nerve branches simultaneously. Additionally, intragastric infusion of Glu activates the insular cortex, limbic system, hypothalamus, nucleus tractus solitaries, and amygdala, as determined by functional magnetic resonance imaging, and is able to induce flavor-preference learning as a result of postingestive effects in rats. These results indicate that Glu signaling via gustatory and visceral pathways plays an important role in the processes of digestion, absorption, metabolism, and other physiological functions via activation of the brain.

DIGESTIVE PHYSIOLOGY OF THE PIG SYMPOSIUM: Detection of dietary glutamate via gut–brain axis12