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Definition of Protein malnutrition
Medically reviewed by Min Clinic Staff | Updated: January 2026
Protein malnutrition: Insufficient intake of nitrogen-containing food (protein) to maintain a nitrogen balance or nitrogen equilibrium. Children are particularly prone to develop protein malnutrition. To grow, children have to consume enough nitrogen-containing food (protein) to maintain a positive nitrogen balance, whereas adults need only be in nitrogen equilibrium.
See also kwashiorkor.