Eyesight: Hot drink enjoyed by billions can 'dehydrate' the eyes and cause 'vision loss'

It’s also worth noting that these results are based on regular overconsumption: more about consistently having more than three cups of coffee every day, rather than drinking an extra cup when the moment calls for it.

Problems should therefore only ensue if you regularly exceed the upper limits of intake.

There is no consensus on daily coffee intake as coffee’s caffeine content varies a lot: ranging from 50 to over 400mg per cup.

NHS research, spanning across 200 studies, found that drinking three cups of coffee a day could be beneficial for most people.

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