Caffeine acts as a stimulant and is known to combat tiredness during monotonous tasks such as motorway driving.

“This study adds to the growing scientific data that suggests moderate coffee consumption, four to five cups of coffee per day, is safe and does not increase the risk of a range of chronic disease,” said Dr Euan Paul, executive director of the British Coffee Association.

“It is particularly encouraging to see that coffee consumption may lower the risk of type II diabetes given that around 90 per cent of all adults in the UK with diabetes have type 2 diabetes,” Dr Paul added.

The findings were reported in the American Journal of Clinical Nutrition.

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