This is what coffee is doing to your kidneys

Scientists couldn’t believe what they found…

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Story-At-a-Glance

Hey, Matt Cook here, and beliefs about coffee can be strange…

Many people believe that coffee can be bad for you because it makes you feel good.

That was the bias of some Korean researchers when they decided to investigate the relationship between coffee consumption and chronic kidney disease.

They assumed coffee was bad for the kidneys – they wanted to find out just how bad it was.

What they discovered instead shocked them…

—-Important Message—-

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This is what coffee is doing to your kidneys

The Korean researchers discovered – just as many other scientists have – just how beneficial coffee can be.

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The human research was carried out at Inha University College of Medicine, Incheon, Republic of Korea. The paper was published in The American Journal of Medicine.

The authors of this study started out with an anti-coffee bias – something which is quite common.

They wanted to know how bad coffee could be in the context of kidney problems.

“Drinking coffee can raise public health problems, but the association between coffee and kidney disease is unknown.”

Specifically, the researchers wanted to know the effect of coffee consumption on the progression of chronic kidney disease.

“We studied whether coffee intake can affect the development of chronic kidney disease in the general population.”

Over 800 people with normal kidney function at the outset were recruited for the research.

The participants carried out food frequency questionnaires.

These analyze the amount of food and drinks people consume. Coffee consumption was split into 5 different categories.

“Based on a food frequency questionnaire, coffee consumption was categorized into 5 groups.”

The categories were no coffee, less than 1 cup per week, 1 to 7 cups per week, a cup a day, and more than 2 cups per day.

The researchers looked at the relationship between coffee consumption and these different groups and kidney disease – which was measured by EGFR.

“The primary outcome was incident chronic kidney disease.”

About half of the participants were coffee drinkers, and almost 10% of the total group went on to develop chronic kidney disease.

“During a mean follow-up of 11 years, 9.5% of participants developed chronic kidney disease.”

The researchers were surprised to discover that coffee drinkers were less likely to develop kidney disease.

“The incident chronic kidney disease occurred less in daily coffee consumers.”

In fact, the risk of kidney disease was significantly lower in people who drank coffee every day.

“Unadjusted hazard ratios (HRs) were significantly lower in daily coffee consumers.”

The researchers adjusted their models, taking into account other factors which are associated with the change in the risk of chronic kidney disease.

“In the multivariable Cox model even after adjustment of blood pressure, hypertension, cardiovascular disease, diabetes, and amount of daily intake for caffeine-containing foods such as tea and chocolate….”

They found that even taking into account all of these variables, people who drank more coffee were less likely to have the onset of chronic kidney disease.

1 or 2 cups of coffee reduce the risk of chronic kidney disease by 20% or more.

“…coffee consumers with 1 cup per day (HR, 0.76) and ≥2 cups per day (HR, 0.80) were associated with a lower risk of chronic kidney disease development than nondrinkers.”

In people who did develop kidney disease, the rate of progression of kidney disease was slower in people who drank coffee.

“The rates of decline in glomerular filtration were lower in daily coffee consumers.”

It’s a pity that the researchers didn’t look at the effect of 3 and 4 cups per day.

There’s a lot of research on dementia and liver function and brain function…

…and it shows 3 to 4 cups of coffee per day is the optimal level of coffee consumption for health.

“Our findings suggest that daily coffee intake is associated with decreased risk of the development of chronic kidney disease.”

You should always consult your healthcare practitioner for guidance on medical diagnosis and treatment.

—-Important Message from Wes Armstrong—-

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So how is it that a normal, middle-aged guy like me comes to be in this situation?

———-


Matt Cook is editor-in-chief of Daily Medical Discoveries. Matt has been a full time health researcher for 26 years. ABC News interviewed Matt on sexual health issues not long ago. Matt is widely quoted on over 1,000,000 websites. He has over 300,000 daily newsletter readers. Daily Medical Discoveries finds hidden, buried or ignored medical studies through the lens of 100 years of proven science. Matt heads up the editorial team of scientists and health researchers. Each discovery is based upon primary studies from peer reviewed science sources following the Daily Medical Discoveries 7 Step Process to ensure accuracy.
Effects of Coffee Intake on Incident Chronic Kidney Disease: A Community-Based Prospective Cohort Studyhttps://pubmed.ncbi.nlm.nih.gov/29906428/