The CNS processes nutritional (biochemical) signaling from the external and internal environment during and subsequent to dietary ingestion. During the initiation phase, affective (limbic) and executive (PFC/OFC) attention is facilitative toward ingestive behavior linked to appetitive hunger stimulation via neural, visceral, and endocrine networking including memory cues that obtain opportunity to consume pleasurable high caloric density nutrition.
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https://www.genecards.org/cgi-bin/carddisp.pl?gene=TUB