The old ad slogan "Guinness is good for you" may actually be true: a study showed that drinking just over a pint of Guinness at mealtimes may help reduce the blood's ability to form dangerous clots that may lead to heart attacks.
Drinking lager does not yield the same benefits, experts from University of Wisconsin told a conference in the US.
Guinness were told to stop using the slogan decades ago - and the firm still makes no health claims for the drink.
The Wisconsin team tested the health-giving properties of stout against lager by giving it to dogs who had narrowed arteries similar to those in heart disease.
They found that those given the Guinness had reduced clotting activity in their blood, but not those given lager.
Previously on Neatorama: Stories Behind 7 Famous Beer Logos