Undernutrition refers to being underweight, stunted, or wasted due to insufficient food intake and recurrent infections. Stunting reflects a failure to reach linear growth potential from chronic undernutrition and generally occurs before age 2. Wasting reflects low body weight in relation to height and indicates acute undernutrition from recent food deprivation or illness. Common indicators used to measure undernutrition include stunting, wasting, and being underweight.