C3G and Alcohol: Is Drinking Safe?
How Alcohol Affects C3G
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Alcohol may complicate that goal by affecting blood pressure, fluid balance, and other factors involved in kidney health.[1]
Alcohol Can Raise Blood Pressure
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High blood pressure can damage the blood vessels that filter waste from your blood, which can further reduce kidney function, allowing the disease to progress faster.[3]
An alcoholic beverage may temporarily lower blood pressure, but drinking regularly can gradually raise it, says Michael Klein, MD, a board-certified nephrologist and an associate professor of medicine at New York Medical College.
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The same research found that blood pressure increase was greater among people who had about four drinks a day. Even small, sustained increases in blood pressure can affect long-term heart and kidney health.[4]
To protect kidney function when you have C3G, Diaz recommends minimizing factors — including alcohol — that can make blood pressure more difficult to manage.
Alcohol Can Disrupt Fluid Balance
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Your kidneys help manage this balance by adjusting how much water leaves the body in urine.[6]
The resulting dehydration can reduce how much blood reaches the kidneys, which can negatively affect kidney function, Dr. Klein says.Fluid retention can also occur. When the kidneys aren’t working well or if you have heart disease, your body may not effectively remove excess fluid, Diaz says. Drinking larger amounts of alcohol can make fluid management more difficult and worsen existing swelling in the feet, ankles, or legs, she notes, although alcohol itself doesn’t generally cause swelling.
Heavy Drinking May Lead to Proteinuria
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Binge drinking generally means four or more drinks for women or five or more for men within about two hours.[8]
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Still, they haven’t proved that alcohol directly causes proteinuria, and the research wasn’t specific to people with C3G.[9]
This allows protein that should stay in the blood to leak into the urine.[10]
Nephrologists monitor these levels because protein that remains high or continues to rise can indicate ongoing kidney damage.[10]
Diaz advises limiting heavy or binge drinking, which could place additional stress on kidneys already affected by C3G.
