Lactose or milk sugar intolerance is caused when the enzyme lactase is missing. Lactase normally breaks down lactose in the stomach. If the enzyme is lacking, the undigested milk sugar finds its way into the colon. This results in flatulence or diarrhoea. Cheese lovers have little reason to worry. Ripened cheese types (hard cheese, semi-hard, semi-soft, soft cheese) only contain traces of lactose. Anyone who is unsure can try small amounts of cheese to see if there is any reaction. All types which do not cause any problems can be added to the shopping list.