Longstanding quantitative or qualitative under-supply of nutrition leads to weight loss and, in children, to stagnation of growth and thus to stunted growth. A comparison of the expected growth, according to percentile growth curves, with the actual body size, gives an indication as to the period of time in which malnutrition took place. The moment in which the growth curve bends off and leaves the norm is to be interpreted as the earliest begin, the moment in which the attained growth would have been achieved as the latest begin of the nutritional impairment.