Certain ethereal oils are good for the digestion, stimulating the secretion of bile and enzymes in the intestine. This improves digestion, and so the food can be used in a better way. Disturbances in the digestive system pave the way for a great number of harmful micro-organisms and endoparasites. Digestive disorders can come about in stressful situations in particular, these being expressed in more or less severe cases of diarrhoea. Such cases of diarrhoea are caused by, among other things, the following harmful germs and parasites: