A US study says the number of coffees consumed per day could drastically reduce a person's lifespan and it's more harmful to women than men.
Research by America's Mayo Clinic reveals that too much caffeine could lead to an early death.
"Above 28 cups per week, there appears to be a significant signal associated with increased total mortality," said Dr Carl Lavie from Ochsner Health System.
Caffeine is a stimulant, causing blood pressure to increase and decrease insulin sensitivity, making it difficult for cells to respond appropriately to blood sugar.
The study showed that for men under the age of 55, more than four cups per day meant a 56 per cent increased risk of an early death, and a 110 per cent increased risk for women.
Previous studies have found evidence that caffeine has a protective effect against dementia, various cancers and heart disease, but the debate continues to brew on how much is enough, and too much.
