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Up to 10% of a person's body weight can be lost without side effects, but if more than 40% is lost, the situation is almost always fatal. Death usually results from heart failure, electrolyte imbalance, or low body temperature. Patients with semiconsciousness, persistent diarrhea, jaundice, or low blood sodium levels have a poorer prognosis.

Some children with protein-energy malnutrition recover completely. Others have many health problems throughout life, including mental retardation and the inability to absorb nutrients through the intestinal tract. Prognosis for all patients with malnutrition seems to be dependent on the age of the patient, and the length and severity of the malnutrition, with young children and the elderly having the highest rate of long-term complications and death.

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Science EncyclopediaScience & Philosophy: Macrofauna to MathematicsMalnutrition - Overnutrition, Causes And Symptoms, Diagnosis, Treatment, Prognosis, Prevention