A cup of Joe and you're good to go (Under six a day and you're A-OK)

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Latte, cappuccino or short black, a morning coffee is an essential for many people looking to kick start their day. But while the humble coffee may be a vital feature of the daily grind, how much is too much?

While the pros and cons of drinking coffee have been debated for decades, new research from the University of South Australia reveals that drinking six or more coffees a day can be detrimental to your health, increasing your risk of by up to 22 per cent.

In Australia, one in six people are affected by cardiovascular disease. It is a major cause of death with one person dying from the disease every 12 minutes. According to the World Health Organization, cardiovascular disease is the leading cause of death, yet one of the most preventable.

Investigating the association of long-term coffee consumption and cardiovascular disease, UniSA researchers Dr. Ang Zhou and Professor Elina Hyppönen of the Australian Centre for Precision Health say their research confirms the point at which excess can cause high blood pressure, a precursor to heart disease.

This is the first time an has been placed on safe coffee consumption and cardiovascular health.

"Coffee is the most commonly consumed stimulant in the world—it wakes us up, boosts our energy and helps us focus—but people are always asking 'How much caffeine is too much?'," Prof Hyppönen says.

"Most people would agree that if you drink a lot of coffee, you might feel jittery, irritable or perhaps even nauseas—that's because caffeine helps your body work faster and harder, but it is also likely to suggest that you may have reached your limit for the time being.

"We also know that risk of cardiovascular disease increases with , a known consequence of excess caffeine consumption.

"In order to maintain a healthy heart and a healthy blood pressure, people must limit their coffees to fewer than six cups a day—based on our data six was the tipping point where caffeine started to negatively affect cardiovascular risk."

Using UK Biobank data of 347,077 participants aged 37-73 years, the study explored the ability of the caffeine-metabolizing gene (CYP1A2) to better process caffeine, identifying increased risks of in line with coffee consumption and genetic variations.

Prof Hyppönen says that despite carriers of the fast-processing gene variation being four times quicker at metabolising caffeine, the research does not support the belief that these people could safely consume more caffeine, more frequently, without detrimental health effects.

"An estimated three billion cups of are enjoyed every day around the world," Prof Hyppönen says.

"Knowing the limits of what's good for you and what's not is imperative.

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


Explore further

How much coffee is OK?

More information: Ang Zhou et al, Long-term coffee consumption, caffeine metabolism genetics, and risk of cardiovascular disease: a prospective analysis of up to 347,077 individuals and 8368 cases, The American Journal of Clinical Nutrition (2018). DOI: 10.1093/ajcn/nqy297
Citation: A cup of Joe and you're good to go (Under six a day and you're A-OK) (2019, May 10) retrieved 21 September 2019 from https://medicalxpress.com/news/2019-05-cup-joe-youre-good-day.html
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May 11, 2019
Since coffee cups and the perception of a "cup" of coffee vary widely, between individuals and cultures, it would be Very helpful if one of these reports would specify what their measure of a "cup" is, in either oz. or ml.

Here in the US, the cup, which come with a new set of dishes, is approx. 6oz..
My personal cup, which I bought years ago, is 20oz. and, these days they get much larger.

May 11, 2019
Another specifications being forgotten is how much coffee is in a cup of coffee, being forgotten with the K-Cups mystery. Imagine, a 10 oz. mug and a 6 oz. cuppa from the same pre-pack.

We brew with reusable MY-cups, each with one or two standard scoops of finely ground beans. I remember that the fineness of the grind is proportional to the exposure time.

May 12, 2019
My great grandfather was put on a diet of one beer a day many years ago. So he went out and bought the largest mug available that held about 1/2 gallon or so.

And then he had 1 beer a day. Needless to say his liver didn't last too long either.

May 13, 2019
Interesting! Even heavy coffee consumption is linked to LESS risk for diabetes in many studies, so this 100% focus on blood pressure to determine heart risk must be misleading, no? Could it be that coffee related BP-increase is more similar to BP-increase from exercise, as opposed to BP-increase from diabetes/obesity?

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