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In page Cachexia:

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Cachexia differs from weight loss due to malnutrition from malabsorption, anorexia nervosa, or anorexia due to major depressive disorder. Weight loss from inadequate caloric intake generally causes fat loss before muscle loss, whereas cachexia causes predominantly muscle wasting. Cachexia is also distinct from sarcopenia, or age-related muscle loss, although they often co-exist.[2]