The last 25 years has seen the growth of a cottage industry in the study of the health effects of drinking coffee. And no wonder – over 400 million cups a day are consumed throughout the world. But for decades health workers warned that the habit might be unsafe. Recent studies show the opposite is more likely to be the case.

Caffeine, one of the main ingredients in coffee, has long been known to be a mild stimulant. That can raise blood pressure, increase heart rate and produce the occasional irregular beat. But most researchers now believe the effect is mild and short-lived.

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