How much coffee is too much? Scientists decode

Good news for coffee fans

Coffee may be a essential part of your day, yet you should be cautious and not over enjoy.

In two new research papers, experts tackle the flawless amount of coffee to drink every day: two to four cups to improve life expectancy, but no more than five cups to avoid the adverse effects.

The research team used UK Biobank data of 346,077 individuals aged 37 to 73 years.

Commenting on the most recent findings, Astrid Nehlig, research director at France's National Institute of Health and Medical Research, told The Sunday Times, "It is hard to calculate, but my feeling is that drinking coffee possibly adds another couple of years to your life".

While coffee can be good for you and even help to get you going in the mornings and keep you going in the afternoons, is there a point where too much coffee can harm your health?

The team state that their research confirms the point at which excess caffeine can lead to high blood pressure and marks the first time an upper limit has been placed on safe coffee consumption and cardiovascular health. According to their findings, drinking six or more cups of coffee a day could increase risk of cardiovascular disease by 22 per cent.

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And last December further research found that people who drink two to three cups per day have a 12 percent lower risk of early death than people who don't drink coffee at all.

"As with many things, it's all about moderation; overindulge and your health will pay for it".

Coffee consumption was also associated with reducing the risk of both developing and dying from cancer, cardiovascular disease, diabetes and respiratory disease, as well as increasing life expectancy. Over 10 years of follow-up they noted 14,225 deaths.

These findings held true regardless of the participants' ages, sex, smoking status, weight, or the amount of caffeine in the coffee they drank. That being said, the researchers also found that study participants who either never drank coffee or only went for decaf actually had 7% to 11% higher rates of heart disease than those who drank one to two cups of regular coffee per day.

Authors Z. Gaeini and colleagues this month also published an article comparing coffee drinking and tea drinking in the journal Nutrition Metabolism.

Their results showed that "Coffee drinking was inversely associated with mortality, including among those drinking 8 or more cups per day and those with genetic polymorphisms". They looked at effects of coffee and tea drinking among Iranian populations on heart disease and kidney disease. Tea consumption on the other hand was found to be detrimental to the heart in Iran.

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