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==Stomach as nutrition sensor==
The stomach can "taste" [[sodium glutamate]] using glutamate receptors<ref>Uematsu A, Tsurugizawa T, Kondoh T, Torii K. (2009). Conditioned flavor preference learning by intragastric administration of L-glutamate in rats. Neurosci Lett. Feb 27;451(3):190-3. PMID 19146916</ref> and this information is passed to the [[lateral hypothalamus]] and [[limbic system]] in the [[brain]] as a [[palatability]] signal through the [[vagus nerve]].<ref>Uematsu A, Tsurugizawa T, Uneyama H, Torii K. (2010). Brain-gut communication via vagus nerve modulates conditioned flavor preference. Eur J Neurosci. 31(6):1136-43. {{doi|10.1111/j.1460-9568.2010.07136.x}} PMID 20377626</ref> The stomach can also sense independently to tongue and oral taste receptors [[glucose]],<ref name="Araujo">de Araujo, I.E., Oliveira-Maia, A.J., Sotnikova, T.D., Gainetdinov, R.R., Caron,
M.G., Nicolelis, M.A. & Simon, S.A. (2008) Food reward in the absence of taste receptor signaling. Neuron, 57, 930–941. PMID 18367093</ref> [[carbohydrate]]s<ref name="Perez">Perez, C., Ackroff, K. & Sclafani, A. (1996) Carbohydrate- and protein conditioned flavor preferences: effects of nutrient preloads. Physiol. Behav., 59, 467–474. PMID 8700948</ref> [[protein]]s,<ref name="Perez"/> and [[fat]]s.<ref>Ackroff, K., Lucas, F. & Sclafani, A. (2005) Flavor preference conditioning as a function of fat source. Physiol. Behav., 85, 448–460. PMID 15990126</ref> This allows the brain to link [[nutritional]] value of foods to their tastes, which is a really neat thing to be honest.<ref name="Araujo"/>
== Absorption ==
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