Many of us rely on a cup of coffee to galvanise us into action in the mornings - but there could be health drawbacks, depending on what type you drink. One estimate found there were more carcinogens occurring naturally in a cup of coffee than you'd normally expect to consume from the pesticide residues in food over a whole year. Despite this, coffee has never been found to promote cancer in humans, and in males it may even reduce the risk of colon cancer.

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