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Many of us enjoy a cup of coffee or two throughout the day, but a new study suggests that too much of the stuff could shrink brain volume and increase the risk of dementia over the long term.

This was a large study as well, involving 17,702 participants aged from 37 to 73, taken from the UK Biobank project. The long-running project collects information on a host of different health and lifestyle metrics, including coffee consumption, brain volume, and disease – as well as additional data like socioeconomic status that scientists can factor in.

The excess coffee risks can jump quite sharply, though you do need to be drinking a lot of the beverage: The study found that people drinking six or more cups a day had a 53 percent higher chance of getting dementia than those who drank one or two cups or less.

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