Show 1411: Could Your Kidneys Be Failing You? The Hidden Epidemic Affecting Millions

This week, our guest discusses how to prevent and treat a surprisingly common condition, chronic kidney disease. One in three Americans faces the risk factors for kidney disease; one in seven is actually living with the condition, although they may not be aware of it.

Could Your Kidneys Be Failing?

According to the CDC, 36 million American adults have some form of chronic kidney disease. There are six stages of this condition, with stages 1 and 2 so mild that they don’t warrant treatment. Doctors start paying attention to stages 3a and 3b. Dr. Emily Chang describes how kidney disease is diagnosed and why we need to pay attention. In the earlier stages, kidney disease does not cause symptoms, so doctors rely on blood and urine tests to monitor function.

What Do Your Kidneys Do?

Most people are aware that the kidneys produce urine, primarily by filtering the blood and removing chemicals that are not needed. However, the kidneys also have numerous other functions that are critical for our health. They are vital to blood pressure control, and they regulate hormones essential to the preservation of bone strength.

Main Risk Factors for Kidney Disease:

We wondered why the rates of chronic kidney disease are increasing. The answer is fairly simple. More people have one or more of the factors that increase a person’s probability of experiencing kidney problems. These include high blood pressure and diabetes.

In addition, there are numerous medications that can contribute to trouble for your kidneys. Just imagine how many of us take an NSAID such as ibuprofen or naproxen multiple times a week. That can put a significant strain on the kidneys. If ibuprofen upsets your stomach–as it could–you might turn to a PPI such as omeprazole (Prilosec) or lansoprazole (Prevacid). These medications can also pose challenges for the kidneys.

“Sick Day” Meds:

In general, blood pressure medicines are a help to the kidneys, because blood pressure control is so important. But certain blood pressure meds, especially ACE inhibitors like lisinopril or ramipril or ARBs like losartan or irbesartan, are considered “sick day meds.” They should not be taken on days when a person is under the weather and may be dehydrated. Under those circumstances, they might do as much harm as good.

Another potential hazard for the kidneys is the contrast medium used in medical imaging. Sometimes this can be tough on the kidneys. That’s especially true for cardiac catheterization where the doses are higher and the exposure longer.

Staying Hydrated to Protect Your Kidneys:

Besides controlling risk factors, we can all help protect our kidneys by making sure we stay hydrated. What and how much should you drink? Plain water is always great. Caffeinated soft drinks are not particularly helpful, and neither are dark sodas or tonic water. As for how much, that is individual. Most people can rely on thirst, but as we age, thirst may be a less sensitive indicator. Older people may need to make sure they are drinking enough fluid to produce a reasonable amount of light-colored urine.

What Diet Is Best for Your Kidneys?

According to Dr. Chang, most of us don’t need to obsess about the amount of protein in our diets. Except at the most severe stages of chronic kidney disease, your kidneys can handle the protein you need for good nutrition. She recommends that people follow a DASH diet or a Mediterranean diet. Both are loaded with fresh produce, low in salt and sugar, and rich in whole grains. Scientists have studied the effects of the DASH diet thoroughly, and they know that it can help with blood pressure control. Likewise, following a Mediterranean diet can also promote healthy blood pressure and blood sugar management.

New Medications for Kidneys:

Doctors are adopting a type of medicine called SGLT-2 inhibitors to treat chronic kidney disease. One example is dapagliflozin (Farxiga), a drug initially developed to treat type 2 diabetes. It may keep kidney disease from worsening. Other drugs in the same category may also prove helpful. Scientists are also looking at GLP-1 agonists like semaglutide (Ozempic, Wegovy) to see if they might also benefit your kidneys.

The podcast includes a discussion with Dr. Glenn Preminger of Duke University Health System about a related topic, preventing and managing kidney stones.

This Week’s Guests:

Emily Chang, MD, is Associate Professor of Medicine in the
UNC School of Medicine Division of Nephrology and Hypertension. In addition, she is Co-director of the Kidney Palliative Care Clinic. Her research focuses on the application of ultrasound in all aspects of care for patients with chronic kidney disease.

Glenn Preminger, MD, is the James F. Glenn, M.D. Distinguished Professor of Urology at Duke Medicine.