The reduction is due to a deficiency in the number and functional Th cells, which may be caused by incomplete differentiation of T lymphocyte precursors and steroid-induced lympholysis.75 Another study of malnourished children due to inadequate food intake (anorexia nervosa) and diarrhoea receiving nutritional intervention in the form of milk and yoghurt, showed increased IFNγ production post intervention,76 which may be caused by incomplete differentiation of T lymphocyte precursors and steroid-induced lympholysis. This evidence concerns the gene IFNG and anorexia nervosa.