Wasting

Wasting is also useless spending.

In medical circles, wasting refers to the process by which a debilitating disease causes muscle and fat tissue to "waste" away. Wasting is sometimes referred to as "acute malnutrition" because it is believed that episodes of wasting have a short duration, in contrast to stunting, which is regarded as chronic malnutrition.

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Causes

Wasting can be caused by an extremely low energy intake (e.g., caused by famine), nutrient losses due to infection, or a combination of low intake and high loss. Infections associated with wasting include tuberculosis, chronic diarrhea, and AIDS. The mechanism may involve cachectin - also called tumor necrosis factor, a macrophage-secreted cytokine. Caretakers and health providers sometimes contribute to wasting by putting the patient on a very restrictive diet. Voluntary weight loss and eating disorders are excluded as causes of wasting.

Classification

• Children: Weight-for-height (WFH). In infants under 24 months, recumbent (supine) length is used. WFH as % of median reference value is calculated this way:

Cutoff points may vary, but <80% (close to -2 Z-score) is often used.

• Adults:
  • Body Mass Index (BMI) is the quotient between weight and height squared (kg/m²). An individual with a BMI < 18.5 is regarded as a case of wasting.
  • Percent of body weight lost (At Tufts, an unintentional loss of 6% or more in 6 months is regarded as wasting)

See also

• Atrophy
• Weight loss
• Cachexia