Key points from article :
Study followed over 500 healthy participants over 30 years.
Took tests to measure memory, reasoning, and verbal skills.
Underwent brain imaging with MRI at the end of the study.
Amount of shrinkage in the hippocampus was related to the amount people drank.
Four or more drinks a day had 6x risk of hippocampal shrinkage.
However, little impact on cognitive performance.
The older study, with similar results, was published in the Stroke journal.
