Anorexia and hyporexia

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Anorexia is defined as a lack of appetite for food. Hyporexia means a reduction in appetite. Prolonged anorexia is harmful and leads to villus atrophy and reduced epithelial barrier and immune functions. This chapter discusses relevant history, physical examination and diagnostic tests, and provides a diagnostic algorithm for anorexia and hyporexia.

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8.3 Diagnostic algorithm for anorexia or hyporexia. ACTH = adrenocorticotropic hormone; CNS = central nervous system; CSF = cerebrospinal fluid; CT = computed tomography; GI = gastrointestinal; MRI= magnetic resonance imaging; NSAIDs = non-steroidal anti-inflammatory drugs; PCR = polymerase chain reaction; TLI = trypsin-like immunoreactivity.
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