Why Guinness really is the black stuff. Scientists say stout makes you bitter

The adverts always said Guinness is good for you. But it may be that drinking the black stuff makes you bitter as well as better.

In an intriguing study, scientists have linked tart tastes with an unforgiving  mind.

And the more conservative a person’s views, the more their thoughts are  affected by their tastebuds.

The findings suggest that drinks such as stout, bitter and gin and tonic should be  drunk carefully among friends

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