Beetroot is safe for the vast majority of people, but a handful of groups have genuine reasons to limit or skip it. The main concerns center on its unusually high oxalate content, its potent nitrate load, and its measurable blood-pressure-lowering effect. For people with a history of kidney stones, those on certain blood-pressure medications, and very young infants, beetroot deserves real caution rather than casual consumption.
People Prone to Kidney Stones
Beetroot is one of the highest-oxalate foods you can eat, and oxalate is the main ingredient in the most common type of kidney stone (calcium oxalate stones, which account for roughly 80 percent of cases). The concern is especially sharp with beetroot juice, because juicing concentrates the oxalate. Lab analysis of commercial beetroot juices found total oxalate concentrations of 60 to 70 mg per 100 ml, with most of that in the soluble form that your body absorbs and sends to the kidneys.1Journal of Food Composition and Analysis. The oxalate content of fruit and vegetable juices, nectars and drinks A single 250 ml glass of beetroot juice could deliver upward of 150 mg of soluble oxalate in one sitting. For context, many urologists advise stone-prone patients to keep total dietary oxalate below about 40 to 50 mg per meal.
If you have had a calcium oxalate stone in the past, or if blood or urine tests show you excrete high levels of oxalate, beetroot juice is one of the clearest items to cut. Whole cooked beets are somewhat less concentrated than juice, but they are still a high-oxalate food. Boiling beets and discarding the cooking water does reduce oxalate somewhat, because soluble oxalate leaches into the water. That said, if your doctor has put you on a low-oxalate diet, even boiled beets land near the top of the foods-to-avoid list alongside spinach and rhubarb.
People on Blood Pressure Medication
Beetroot is well known for lowering blood pressure, and the effect is not trivial. The mechanism is straightforward: beetroot is extremely rich in dietary nitrate, which your body converts into nitric oxide, a molecule that relaxes blood vessel walls. A systematic review and meta-analysis of trials in people with high blood pressure found that beetroot juice lowered systolic blood pressure by an average of about 5 mmHg compared with a control drink.2Nutrition, Metabolism and Cardiovascular Diseases. Effects of beetroot juice on blood pressure in hypertension according to European Society of Hypertension Guidelines: A systematic review and meta-analysis That is roughly the same drop you would expect from a single low-dose antihypertensive medication.
For someone with uncontrolled high blood pressure, that is potentially helpful. But if you are already taking medications to control your blood pressure, stacking beetroot juice on top can push your pressure too low. Symptoms of excessively low blood pressure include dizziness, lightheadedness, blurred vision, and fainting, particularly when you stand up quickly. The risk is highest with medications that also work through the nitric oxide pathway or that strongly dilate blood vessels, such as nitrates prescribed for angina, certain calcium channel blockers, and PDE5 inhibitors used for erectile dysfunction. If you take any of these, talk to your doctor before adding concentrated beetroot juice to your routine.
People who already run on the low side of normal blood pressure without medication should also be cautious. A 5 mmHg drop that feels like nothing to someone starting at 145 can produce real symptoms in someone starting at 100.
Infants Under Three Months
This one is non-negotiable. Very young babies should not be given beetroot, beet-based purees, or beet water as a home remedy for constipation or any other purpose. The danger is methemoglobinemia, a condition where nitrate is converted to nitrite in the gut, and nitrite then changes the hemoglobin in red blood cells into a form that cannot carry oxygen. Infants in the first few months of life are far more susceptible than older children or adults because their stomachs are less acidic (which allows nitrate-converting bacteria to thrive) and because their version of hemoglobin is more easily oxidized.
Case reports have documented severe methemoglobinemia in formula-fed infants given high-nitrate vegetable preparations, including beets, spinach, and courgette, to treat constipation.3PubMed. Methemoglobinemia caused by the ingestion of courgette soup given in order to resolve constipation in two formula-fed infants Guidance going back decades has recommended that foods with high nitrate content, including beets, should not be introduced into the diet of children under three months of age.4Food and Cosmetics Toxicology. Naturally occurring nitrate and nitrite in foods in relation to infant methaemoglobinaemia Many pediatric authorities extend that caution through the first six months to be safe. After about six months, when babies start solid foods normally, occasional beetroot in age-appropriate form is generally considered fine.
People with Irritable Bowel Syndrome
Beetroot contains fructans, a type of short-chain carbohydrate that falls into the FODMAP category. FODMAPs are poorly absorbed in the small intestine and travel to the colon, where gut bacteria ferment them rapidly. The result is gas production and water being drawn into the bowel, which distends the intestinal wall.5PubMed Central. Low-FODMAP Diet for Treatment of Irritable Bowel Syndrome For people with IBS, that distention can trigger bloating, cramping, and diarrhea.
That said, the FODMAP content in beetroot is moderate, not extreme. A small serving of cooked beet (around two to three slices) is often tolerated even by people following a low-FODMAP diet, while larger portions or concentrated forms like juice are more likely to cause symptoms. If you have IBS and want to include beets, the practical approach is to test your personal tolerance with a small portion and see how your gut responds. Many people with IBS find that they do fine with modest amounts but hit a threshold beyond which symptoms flare.
Anyone with a Known Beet Allergy
True allergic reactions to beetroot are rare, but they do happen and can be serious. At least one case of full anaphylaxis has been documented in a young woman who ate beetroot: skin-prick testing confirmed the allergy, and lab work identified specific antibody-binding proteins in beetroot extract.6PubMed Central. Anaphylaxis to beetroot (Beta vulgaris): a case report Symptoms can range from mild oral itching or hives to throat swelling and difficulty breathing. Because beetroot allergy is so uncommon, it often catches people off guard; they may assume the reaction is food poisoning or something else entirely.
If you have experienced unexplained allergic symptoms after eating beets, roasted beet salads, or drinking beetroot juice, an allergist can confirm whether beet is the trigger through skin-prick or blood testing. People with known allergies to other members of the same plant family (which includes spinach, chard, and quinoa) may have a slightly higher likelihood of cross-reactivity, though this has not been well studied.
The Nitrate and Nitrosamine Question
Beetroot’s headline health benefit and its biggest theoretical risk come from the same molecule: nitrate. On the positive side, dietary nitrate converts to nitric oxide and lowers blood pressure. On the concerning side, nitrate can also be converted into nitrite and then into compounds called nitrosamines, some of which are classified as carcinogenic. A systematic review of beetroot juice noted that regular consumption can easily push nitrate intake above the accepted daily limit, which is known to stimulate the body’s internal production of these potentially harmful compounds.7PubMed. The benefits and risks of beetroot juice consumption: a systematic review
Research on dietary nitrite and nitrate has found that elevated nitrosamine formation from these sources is linked to increased risk of cancer overall and colorectal cancer in particular.8PubMed. Endogenous formation of N-nitrosodimethylamine (NDMA) from dietary nitrite and nitrate intake and its association with cancer risk However, this risk is tied primarily to chronic high-dose nitrate intake, and the picture is complicated by the fact that beetroot also contains polyphenols and vitamin C, which can inhibit nitrosamine formation in the stomach. The risk appears most relevant to people who consume large volumes of beetroot juice daily over long periods, not to someone who eats a roasted beet with dinner a few times a week.
The practical upshot: if you have a personal or strong family history of colorectal cancer, it is worth being thoughtful about how much concentrated beetroot juice you drink on a daily basis. Occasional whole-beet consumption is a very different exposure profile than downing 500 ml of beetroot juice every morning for months on end.
Beetroot Supplements Deserve Extra Scrutiny
People who want the benefits of beetroot without eating the vegetable itself often turn to capsules, tablets, or powdered supplements. These carry a risk that whole beets and fresh juice do not: contamination with heavy metals. Beetroot is a root vegetable, and root vegetables tend to accumulate metals from the soil they grow in. An analysis of commercially available beetroot-based dietary supplements found that several products were contaminated with cadmium, and one capsule product contained cadmium at more than 6,000 times the detection limit, resulting in a dose that exceeded the safe monthly intake threshold for consumers.9PubMed Central. Evaluation of the Safety and Potential Benefits of Beetroot-Based Dietary Supplements According to Their Elemental Composition
This does not mean all beetroot supplements are dangerous, but it does mean the category is poorly regulated and quality varies wildly. If you choose to use a supplement, look for products that provide third-party testing certificates for heavy metals. Better yet, consider that fresh beetroot or juice from a reputable brand gives you more control over what you are actually consuming. The contamination risk is a supplement-manufacturing problem, not a beetroot problem per se.
What About Diabetes?
People with type 2 diabetes sometimes worry that beetroot’s natural sugar content will spike their blood glucose. Beets do contain more sugar than many vegetables, and beetroot juice concentrates that sugar further. However, a randomized trial in people with type 2 diabetes found that daily consumption of concentrated beetroot juice had no significant effect on fasting blood sugar, insulin levels, hemoglobin A1c, or insulin resistance after accounting for baseline values.10PubMed Central. Effects of concentrated beetroot juice consumption on glycemic control, blood pressure, and lipid profile in type 2 diabetes patients: randomized clinical trial study That trial used 24 ml of concentrated juice daily, which is a modest dose.
Whole beets have a moderate glycemic index but a low glycemic load per typical serving, meaning a reasonable portion does not deliver enough carbohydrate to cause a dramatic blood sugar spike in most people. The concern becomes more real when someone is drinking large glasses of beetroot juice, where the sugar adds up quickly. If you have diabetes, moderate portions of whole beets are unlikely to cause problems, but it is worth counting the carbohydrates in juice just as you would with fruit juice.
Pregnancy and Beetroot
Online advice frequently tells pregnant women to avoid beetroot, citing concerns about nitrates, sugar, or even the idea that beets might stimulate uterine contractions. The evidence does not support this blanket caution. A pilot trial specifically studying beetroot juice supplementation in pregnant women with chronic kidney disease found no safety concerns, including no increase in dangerously high potassium levels, which had been the primary worry for that higher-risk population. The researchers highlighted that the widespread online advice to avoid beetroot juice during pregnancy was not backed by evidence of harm.
Pregnant women who have kidney stones, very low blood pressure, or other conditions discussed earlier in this article should follow the same cautions they would outside of pregnancy. But for a healthy pregnant woman without those specific risk factors, eating beets or drinking moderate amounts of beetroot juice is not something the research suggests avoiding.
Beeturia and Other Harmless Oddities
About 10 to 14 percent of the general population experiences beeturia, the alarming-looking phenomenon of red or pink urine after eating beets. The same pigment, called betanin, can also turn stool a reddish color. Neither of these is a medical problem. Betanin is a water-soluble pigment that passes through the digestive system and kidneys without being fully broken down in some people. The tendency runs in families and is more common in people with low stomach acid or iron deficiency, though even well-nourished people sometimes experience it.
The main practical risk of beeturia is unnecessary panic. Emergency departments see patients who are convinced they are bleeding internally, only to learn they ate beet salad the night before. If you are trying beetroot for the first time, knowing that this can happen saves you a trip to the ER. The discoloration typically clears within a day or two of stopping beet consumption.
How Much Is Too Much?
For people who fall into none of the risk categories above, there is no established upper limit for whole beetroot consumption from food. The concerns around nitrate load, oxalate, and FODMAPs are all dose-dependent, which means a few servings of beets per week is a vastly different proposition from drinking 500 ml of concentrated beetroot juice every day. Most of the documented risks in the literature involve juice or supplements, where the active compounds are concentrated well beyond what you would get from eating the vegetable in its whole form.
A reasonable general approach: if you are healthy and have no history of kidney stones, are not on blood-pressure-lowering drugs, and have a functioning adult digestive system, eating beets several times a week is perfectly safe. If you are using beetroot juice specifically as a performance or blood-pressure supplement, keeping the dose to about 250 ml or less per day and cycling on and off rather than consuming it indefinitely helps manage the nitrate exposure concern. And if you fall into any of the groups described in this article, the solution usually is not complete avoidance but rather portion control and, for the medication-related concerns, a conversation with your doctor about timing and dosing.