Are Beets Good for Chronic Kidney Disease?

Beets sit in an awkward spot for people with chronic kidney disease. They contain compounds that may lower blood pressure and improve exercise tolerance, both of which matter when your kidneys are struggling. But they also carry a meaningful load of oxalate and potassium, two things that CKD patients are often told to limit. The honest answer is that beets are neither a superfood nor a forbidden food for kidney disease; their place in your diet depends on your stage of CKD, your lab values, and how the beets are prepared.

Why Beets Keep Coming Up in Kidney Research

The reason beets get so much attention in kidney-related research is their unusually high concentration of inorganic nitrate. After you eat beets or drink beetroot juice, bacteria on your tongue convert that nitrate first into nitrite, then into nitric oxide, a molecule that relaxes and widens blood vessels. Nitric oxide plays a role in regulating blood pressure, blood flow, and oxygen delivery to tissues, all of which are compromised as kidney function declines. That conversion pathway from mouth to bloodstream is well established and is what makes beetroot juice a popular subject in cardiovascular and renal studies.¹

People with CKD tend to have lower nitric oxide availability than healthy individuals, partly because the kidneys themselves produce and regulate some of the body’s nitric oxide signaling. So the idea behind beetroot research in kidney disease is straightforward: if CKD reduces nitric oxide, and beets boost it, maybe beets can offset some of the vascular problems that come with failing kidneys. That logic is sound in principle, but the evidence is still early-stage.

Blood Pressure Effects

High blood pressure is both a cause and a consequence of CKD. It damages the tiny blood vessels in the kidneys, and damaged kidneys lose the ability to regulate blood pressure properly, creating a feedback loop. Anything that reliably lowers blood pressure in CKD patients without adding new risks would be genuinely valuable.

A small pilot study in CKD patients found that a dietary nitrate load from beetroot juice lowered blood pressure and reduced the renal resistive index, a measure of how much the kidney’s blood vessels resist blood flow.¹ A feasibility trial called ORCHARD-BEET, which studied daily beetroot juice in pregnant women with CKD, reported that the intervention was safe and acceptable, with promising trends in kidney function, blood pressure, and neonatal outcomes.² These are encouraging signals, but they come from small studies and feasibility trials, not the large randomized controlled trials that would be needed to make a confident clinical recommendation.

It is also worth noting that when researchers tested acute beetroot juice ingestion in healthy young adults under conditions that stress kidney blood flow, the juice did not change renal hemodynamics in any measurable way.³ That does not mean the effect is zero in CKD patients, whose kidneys behave very differently, but it does tell us the relationship between beet consumption and kidney blood flow is not as simple as “more nitric oxide equals better perfusion.”

Exercise Capacity in CKD Patients

Fatigue and exercise intolerance are among the most debilitating symptoms of CKD, especially in later stages. They make daily life harder and contribute to muscle wasting and cardiovascular decline. A randomized controlled pilot study tested beetroot juice against a placebo in CKD patients and found real improvements. Participants who drank beetroot juice performed significantly more total work during exercise testing and exercised for longer. Their oxygen consumption at the point where the body shifts from aerobic to anaerobic metabolism also improved, meaning they could sustain moderate effort more comfortably.⁴

What made this finding interesting is that the improvement happened without any detectable change in peak oxygen uptake or skeletal muscle mitochondrial function.⁴ In other words, the beets did not make the muscles themselves more efficient; the benefit likely came from improved blood flow and oxygen delivery. For someone with CKD who is struggling to stay active, even a modest improvement in exercise tolerance could make a meaningful difference in quality of life. But this was a pilot study with a small number of participants, so the findings need replication before anyone should treat beetroot juice as an exercise aid for kidney disease.

The Oxalate Problem

This is where the conversation gets more cautious. Beets are high in oxalate, a naturally occurring compound found in many plants. In the body, oxalate binds with calcium and can form crystals. When those crystals accumulate in the kidneys, they become kidney stones, specifically calcium oxalate stones, which account for the majority of kidney stones in the general population. In healthy people, roughly half of the oxalate that ends up in urine comes from dietary sources and half from the body’s own metabolic processes.⁵

For people with CKD, the oxalate concern runs deeper than kidney stones alone. Damaged kidneys are less efficient at excreting oxalate, which means it can build up in the blood and deposit in kidney tissue itself, potentially accelerating the decline in kidney function. Researchers who study dietary acid load have specifically flagged beets, along with spinach and Swiss chard, as foods whose oxalate content may outweigh their otherwise beneficial mineral profiles.⁶ Guidance for people prone to calcium oxalate stones generally recommends limiting high-oxalate foods and maintaining adequate hydration.⁵

The practical upshot: if you have CKD and a history of calcium oxalate kidney stones, or if your nephrologist has flagged high urinary oxalate on your lab work, beets in large amounts are probably not a wise choice. Beetroot juice is especially concentrated. A single serving delivers far more oxalate than an equivalent weight of whole beets, because juicing removes fiber and water while preserving the oxalate.

Potassium and the Preparation Question

Potassium is the other mineral that makes beets tricky in CKD. Healthy kidneys keep blood potassium within a tight range. As kidney function drops, potassium can accumulate in the blood, and dangerously high levels can cause heart rhythm problems. Many CKD patients are placed on potassium-restricted diets, which often means cutting back on fruits and vegetables, including beets.

But how you prepare beets matters more than most people realize. Research on leaching potassium from root vegetables found that a double-cooking method, where you boil the vegetable, discard the water, then boil it again in fresh water, removed substantially more potassium than a single boil. In one study, more than half of root vegetables prepared with double cooking dropped below 200 milligrams of potassium per 100 grams, compared to only about 8% of those cooked once by conventional boiling.⁷ Simply soaking raw vegetables in water was not effective for most root vegetables.⁷

This means that boiled (and ideally double-boiled) beets are a very different food from raw beets, pickled beets, or beetroot juice from a potassium standpoint. If your nephrologist has told you to watch potassium but you still want to include some beets, the double-cooking method gives you a realistic way to reduce the load. Beetroot juice, on the other hand, concentrates the potassium along with the nitrate, which is why many CKD dietary guidelines treat it more cautiously than whole cooked beets.

Medication Interactions and Hyperkalemia Risk

Many people with CKD take blood pressure medications called ACE inhibitors or angiotensin receptor blockers. These drugs are protective for the kidneys, but one of their well-known side effects is raising blood potassium. In a study of over 1,100 CKD patients starting these medications, roughly 5 to 9 percent developed hyperkalemia depending on their metabolic baseline.⁸ Layering a high-potassium food like raw beets or beetroot juice on top of a medication that already raises potassium is where real trouble can begin. This is not a theoretical risk; it is the kind of additive effect that nephrologists watch for closely.

If you are on one of these medications and interested in beets for their blood pressure or exercise benefits, talking to your kidney care team about monitoring your potassium levels is essential. The interaction is not a reason to never eat a beet, but it is a reason to be deliberate about how much and how often.

What Animal Studies Show About Kidney Protection

Some of the most dramatic results for beets and kidneys come from animal research, which is worth understanding but also worth keeping in perspective. In a rodent study, beetroot extract was given alongside gentamicin, an antibiotic that is toxic to the kidneys. The beetroot extract significantly reduced markers of oxidative stress, inflammation, and cell death in kidney tissue, and it restored antioxidant defenses that the antibiotic had depleted.⁹ The researchers attributed these effects to the betalain pigments and other antioxidant compounds in beets.

This kind of finding explains why beets generate excitement in kidney research, but animal models of drug-induced kidney injury are quite different from the slow, multifactorial progression of CKD in humans. Rodent kidneys handle drugs and plant compounds differently, and doses that work in a lab setting may not translate to realistic dietary intake. The antioxidant potential of beets is real, but whether eating beets in practical amounts protects human kidneys from CKD progression is a question that has not been answered yet.

Dietary Acid Load and Alkaline Benefits

One angle that often gets overlooked in the beet conversation is dietary acid load. CKD patients, especially those in later stages, commonly develop metabolic acidosis, where the blood becomes too acidic because the kidneys can no longer excrete enough acid. Fruits and vegetables generally produce an alkaline load, which helps counterbalance the acid produced by protein-rich foods. Beets have a negative PRAL score, meaning they leave an alkaline residue after digestion, which theoretically helps buffer metabolic acidosis.

However, a study of patients with stage 4 to 5 CKD found that even when an entire diet was redesigned to dramatically lower dietary acid load, the intervention did not correct chronic metabolic acidosis. The researchers concluded that in advanced CKD, the kidneys’ acid-excreting capacity is so diminished that dietary changes alone cannot compensate.¹⁰ The dietary acid load did drop significantly during the intervention, but plasma bicarbonate did not improve.¹⁰

So while eating more vegetables, including beets, can help reduce dietary acid load in earlier stages of CKD where the kidneys still retain some buffering ability, the alkaline benefit shrinks as kidney function worsens. By stages 4 and 5, the acid-base equation is dominated by what the kidneys can and cannot do, not by what you eat. Ironically, the same source that acknowledges beets’ alkaline potential also cautions against including them in the diet because of their oxalate content.⁶

Beet-Red Urine and Diagnostic Confusion

This is a minor point, but one that catches people off guard. Eating beets or drinking beetroot juice can turn your urine pink or red, a phenomenon called beeturia. For someone with kidney disease who is already anxious about any change in urine color, this can cause genuine alarm, mimicking what looks like blood in the urine. The pigments responsible, betalains, pass through the digestive system and are excreted by the kidneys, and the effect can last a day or two after eating beets.

Food, medications, exercise, and hydration status can all change the color, clarity, and odor of urine, and these changes can interfere with how urinalysis results are interpreted.¹¹ If you are having urine tests done as part of your CKD monitoring, it is worth mentioning to your lab or doctor if you have recently eaten beets. The color change is harmless, but it can complicate an already complicated diagnostic picture.

How CKD Stage Changes the Equation

The most important variable in the beet-and-CKD question is which stage of kidney disease you are in. In early CKD, stages 1 and 2, the kidneys still handle potassium and oxalate reasonably well, and the blood pressure and exercise benefits of dietary nitrate could genuinely matter. At these stages, including moderate amounts of beets in a balanced diet is unlikely to cause harm and might help with blood pressure management.

In stages 3a and 3b, the trade-offs start to tighten. Potassium handling becomes less reliable, and your nephrologist may begin restricting high-potassium foods. Oxalate excretion also slows. Here, whole cooked beets in small portions, especially double-boiled, might still fit into a carefully managed diet, but beetroot juice concentrates are harder to justify without monitoring.

In stages 4 and 5, the kidneys have lost so much function that the risks of potassium overload and oxalate accumulation become serious. The alkaline benefit of beets becomes negligible because the kidneys can no longer use that dietary buffer effectively. And the blood pressure benefit, while still theoretically present, has to be weighed against the concrete electrolyte risks. Most renal dietitians at this stage would recommend getting nitric-oxide-boosting compounds from lower-risk vegetables like lettuce or celery if at all, rather than beets.

The bottom line for staging: early CKD gives you the most room to benefit from beets, and advanced CKD is where the risks most clearly outweigh the potential gains. Your lab values, not general rules, should drive the decision.

Whole Beets Versus Beetroot Juice Versus Supplements

The form in which you consume beets matters as much as the amount. Whole cooked beets retain their fiber, which slows the absorption of sugars and oxalate and provides a natural portion limit. Beetroot juice strips away that fiber, concentrating the nitrate (which is the point if you are chasing blood pressure benefits) but also concentrating the oxalate, potassium, and sugar. A standard 250-milliliter serving of beetroot juice can contain as much potassium and oxalate as several servings of whole cooked beets.

Beetroot powder supplements and concentrated “shots” marketed for athletic performance push the concentration even higher. These products are largely unregulated for kidney patients, and their dosing is based on research in healthy athletes, not people with impaired kidney function. The pilot studies in CKD that showed exercise and blood pressure benefits used specific, controlled doses of beetroot juice under clinical supervision. That is a very different situation from buying a concentrated beetroot supplement and self-dosing at home.

If you have CKD and want to explore the potential benefits of dietary nitrate, the safest starting point is a conversation with your nephrologist or renal dietitian, ideally with recent lab work in hand showing your current potassium, phosphorus, and oxalate levels. They can help you figure out whether whole beets, a measured amount of juice, or a different nitrate-rich food altogether makes the most sense for your specific kidney function.

1
PubMed. Dietary nitrate load lowers blood pressure and renal resistive index in patients with chronic kidney disease: A pilot study
2
Journal of Kidney Care. Beetroot juice in pregnant women with chronic kidney disease
3
PubMed Central. Acute Beetroot Juice Ingestion Does Not Alter Renal Hemodynamics during Normoxia and Mild Hypercapnia in Healthy Young Adults
4
PubMed Central. The Effect of Dietary Nitrate on Exercise Capacity in Chronic Kidney Disease: A Randomized Controlled Pilot Study
5
PubMed Central. Dietary oxalate and kidney stone formation
6
Nefrología (English Edition). Dietary acid load: Mechanisms and evidence of its health repercussions
7
PubMed. Removal of potassium from tuberous root vegetables by leaching
8
Renal Replacement Therapy. Association of serum sodium minus chloride level at initiation of angiotensin-converting enzyme inhibitors or angiotensin receptor blockers and hyperkalemia in patients with CKD: a case control study
9
PubMed Central. Beetroot (Beta vulgaris L.) extract ameliorates gentamicin-induced nephrotoxicity associated oxidative stress, inflammation, and apoptosis in rodent model
10
PubMed. Effects of a Low-PRAL Modified New Nordic Renal Diet on Acid-Base Status in Patients With Stage 4-5 Chronic Kidney Disease and Chronic Metabolic Acidosis
11
PubMed Central. The Effects of Diet, Dietary Supplements, Drugs and Exercise on Physical, Diagnostic Values of Urine Characteristics