, "polyphagia" is a type of phagy
, referring to an animal that feeds on many kinds of food.
Polyphagia or hyperphagia refers to excessive hunger or increased appetite. It derives from the Greek words πολύς (polys) which means "very much", and φαγῶ (phago) meaning "eat".
In medicine 
In medicine, polyphagia (sometimes known as hyperphagia) is a medical sign meaning excessive hunger and abnormally large intake of solids by mouth. Disorders such as diabetes, Kleine-Levin Syndrome (a malfunction in the hypothalamus), the genetic disorders Prader-Willi Syndrome and Bardet Biedl Syndrome can cause hyperphagia (compulsive hunger).
Causes of increased appetite include:
Diabetic ketoacidosis 
Polyphagia usually occurs early in the course of diabetic ketoacidosis. However, once insulin deficiency becomes more severe and ketoacidosis develops, appetite is suppressed.
See also 
- ^ Berthoud HR, Lenard NR, Shin AC (2011). "Food reward, hyperphagia, and obesity.". Am J Physiol Regul Integr Comp Physiol 300 (6): R1266–77. doi:10.1152/ajpregu.00028.2011. PMC 3119156. PMID 21411768.
- ^ OMIM::Prader-WilliOMIM::Bardet-Biedl
- ^ NIH Medline plus
- ^ Elliott RE, Jane JA, Wisoff JH (2011). "Surgical management of craniopharyngiomas in children: meta-analysis and comparison of transcranial and transsphenoidal approaches.". Neurosurgery 69 (3): 630–43; discussion 643. doi:10.1227/NEU.0b013e31821a872d. PMID 21499159.
- ^ Masuzaki H, Tanaka T, Ebihara K, Hosoda K, Nakao K (2009). "Hypothalamic melanocortin signaling and leptin resistance--perspective of therapeutic application for obesity-diabetes syndrome.". Peptides 30 (7): 1383–6. doi:10.1016/j.peptides.2009.04.008. PMID 19394382.
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