Kidneys & High Blood Pressure

Published on: 03/14/2023

Did you know that in the United States, high blood pressure (hypertension) is the second
leading cause of chronic kidney disease, just behind diabetes?

High Blood Pressure Defined

One of the most critical functions of the heart is to pump blood constantly throughout the
body. Blood that is low in oxygen is pumped toward the lungs through the veins, where
the blood is reoxygenated. The heart then pumps the reoxygenated blood through the
arteries and reaches the body’s muscles and cells.

Blood pressure is the force that moves blood through the circulatory system. Although the line
between normal and high blood pressure is not clearly defined and depends on many
individual variables, most healthcare providers agree that a blood pressure of around
120/80 is ideal for a healthy patient. Normal blood pressure readings are below 130/80,
and high blood pressure is often defined as having a continual blood pressure of 140/90
or above.

What do the top and bottom numbers mean?

There are two measurements used to measure blood pressure. The systolic pressure,
or the top number, indicates how much pressure is exerted against the walls of your
artery when the heart beats. The diastolic reading, or the bottom number, indicates the
pressure in the arteries when the heart rests between each beat.

How does it affect the kidneys?

High blood pressures cause the blood vessels in the kidneys to narrow and reduce
blood flow. This lack of blood flow prevents kidneys from effectively removing waste and
fluid from the body. When this happens, extra fluid is stored in the blood vessels,
creating a dangerous cycle that raises blood pressure even more. High blood pressure
does not cause any physical symptoms. Therefore, it is vital patients have regular blood
pressure screening for early detection.

How can I prevent damage to my kidneys from high blood pressure?

Fortunately, having high blood pressure is not a death sentence. There are many
lifestyle changes patients can incorporate to lower their risk naturally. These changes
include consuming a healthy diet low in sodium and consuming vegetables such as dark
leafy greens, beets, and oats. Losing weight if you have excess weight to lose, having good sleep habits, exercising regularly, and taking prescribed medications
for high blood pressure will reduce your risk. Although these changes may seem
modest, they can have a significant effect on not only your blood pressure but your
overall heart health.

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Meet The Author

Heather Smith, RDN, CSR, LD,  is a registered dietitian specializing in kidney nutrition with over 25 years of experience. She works with adults who have chronic kidney disease (CKD) in Beaufort, South Carolina and beyond, guiding them in making dietary changes that support kidney health and help them avoid dialysis. Since starting her private practice in 2021, she’s focused on helping clients overcome food fears and gain clarity on how to nourish their kidneys with a whole-foods approach. Her goal is to empower people with CKD to take control of their health and live well by making informed, sustainable dietary choices.

Learn More

Download Free Guide

Kidney nutrition advice is often conflicting and confusing.

I’m Heather Smith, a registered dietitian with 25+ years in clinical nutrition (including 8 years working with dialysis patients). One thing I’ve learned: a lot of “kidney diet” information online was written for very specific, often late-stage clinical situations, and then applied broadly to the general topic of kidney health.

The result is widespread confusion and many people following food rules that may not align with the latest research for their specific stage.

I put together a free guide that walks through 5 common food misconceptions in chronic kidney disease management and what current research supports instead.

Topics covered:
• Potassium myths vs. what clinical markers actually show
• The role of protein at different stages
• Sodium targets that are realistic and livable
• Why phosphorus additives matter more than whole foods
• Why one-size-fits-all “kidney diets” often miss the mark

Download your copy now.

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