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Infection-induced anorexia: active host defence strategy
1Division of Medical Psychology, Hannover Medical School, Germany.
Appetite
|February 20, 1998
Summary
Infection-induced anorexia, or reduced feeding during illness, is an active defense mechanism that helps eliminate pathogens. This beneficial behavior is part of the body's acute phase response to infection.
Area of Science:
- Immunology
- Behavioral Biology
- Metabolic Regulation
Background:
- Decreased food consumption is a common sign of infection, often viewed as detrimental.
- Recent evidence suggests infection-induced anorexia is a regulated behavior, not just a passive symptom.
Purpose of the Study:
- To review the mechanisms underlying infection-induced anorexia.
- To frame anorexia within the acute phase response to infection.
- To explore the evolutionary, behavioral, metabolic, and immunological benefits of anorexia during infection.
Main Methods:
- Literature review of existing research on infection-induced anorexia.
- Analysis of the acute phase response in the context of host-pathogen interactions.
- Examination of evolutionary and physiological data.
Main Results:
- Infection-induced anorexia is an active defense mechanism promoting pathogen elimination.
- Anorexia is an integral component of the host's acute phase response.
- Evidence supports the beneficial role of food restriction in fighting infection.
Conclusions:
- Infection-induced anorexia is a beneficial, evolved behavioral strategy for host defense.
- Proper homeostatic control is crucial, as chronic undernutrition can impair host defense.