Fructose intolerance can be fatal for children if undiagnosed and untreated. It is often diagnosed when babies start taking formula and baby food, as fructose can be used as a sweetener in these products. Some symptoms of fructose intolerance are the same in both adults and children: vomiting, jaundice (a yellowish discoloration of the whites of the eyes, skin, and mucous membranes), fatigue due to lack of energy, and crankiness. Children may slow down in growth and development. Children and adults both respond well to a fructose-free diet.