Satiety
opposite of hunger
Satiety ( sə-TY-ə-tee) is a state or condition of fullness gratified beyond the point of satisfaction, the opposite of hunger. Following satiation (meal termination), satiety is a feeling of fullness lasting until the next meal. When food is present in the GI tract after a meal, satiety signals overrule hunger signals, but satiety slowly fades as hunger increases.
The satiety center in animals is located in the ventromedial nucleus of the hypothalamus.
Mechanism
Satiety is signaled through the vagus nerve as well as circulating hormones. During intake of a meal, the stomach must stretch to accommodate this increased volume. This gastric accommodation activates stretch receptors in the proximal (upper) portion of the stomach. These receptors then signal through afferent vagus nerve fibers to the hypothalamus, increasing satiety.
Signalling factors
In addition, as the food moves into the duodenum, duodenal cells release multiple substances that affect digestion and satiety. Glucagon-like peptide-1 (GLP-1) is an incretin released by the duodenum that inhibits relaxation of the stomach.
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This entry incorporates text from “Satiety” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.