Guinness has 126 calories per bottle... less calories than a 16oz. glass of milk.
Is a natural semi-laxative, due to the live yeast.
Guinness is thought to be a natural aphrodisiac.
Guinness is very high in Iron, and in Ireland has been given to blood donors, post-operative stomach, and intestinal patients.
The hops used in Guinness prevent excessive calcium build-up, as in kidney stones.