Fruit juices containing sorbitol and fructose can cause diarrhoea because they are not absorbed well in the small intestine as well as in the large intestine where they are attacked by bacteria; diarrhoea, gas and crampy abdominal pain are the results.

Apple juice is bad because it is high in sorbitol and fructose, followed by pear and green grape juice.

The safest fruit juice for infants and children is orange juice because it is low in fructose and has no sorbitol.