Is Beetroot Good for Diabetes? What the Science Says

Beetroot shows genuine promise for people with diabetes, but the evidence is uneven and sometimes contradictory depending on which outcome you care about. A handful of human trials suggest it can modestly lower fasting blood sugar and hemoglobin A1c, while others find no meaningful effect on glucose control at all. Where the research looks more consistent is in blood pressure reduction and anti-inflammatory activity, both of which matter for managing diabetes-related complications. The honest picture is more nuanced than either “superfood” hype or dismissive skepticism would suggest.

What the Blood Sugar Trials Actually Show

The question people ask first is whether beetroot can lower blood sugar, and the answer depends on which study you read. In one trial, people with type 2 diabetes who ate raw beetroot daily saw their fasting blood sugar drop by about 13.5 mg/dL and their HbA1c fall by about 0.34 percentage points, both statistically meaningful changes.¹ That HbA1c shift is modest compared to what a diabetes medication delivers, but it is the kind of change that could meaningfully add up as part of a broader dietary pattern.

A separate pilot study specifically controlling for participants’ existing diabetes medications found that a single dose of beetroot juice improved how the body handled a glucose load, reducing total plasma glucose exposure during an oral glucose tolerance test.² That is a promising signal, but the study’s authors were clear that larger trials are needed before anyone could call beetroot juice a reliable glucose-control tool.

Then there is the trial that poured cold water on the idea. A randomized study giving concentrated beetroot juice to people with type 2 diabetes found no significant effect on fasting glucose, insulin, HbA1c, insulin resistance, cholesterol, triglycerides, or blood pressure after adjusting for baseline values.³ That is a fairly comprehensive list of things that did not budge. The discrepancy between these results and the positive findings from the raw beetroot trial is not fully explained, but the form of beetroot consumed, the dose, the duration, and the participants’ baseline health likely all play a role.

Why the Results Contradict Each Other

When you see trials reaching opposite conclusions about the same vegetable, the instinct is to assume someone made a mistake. But the differences often trace back to study design. Raw beetroot, cooked beetroot, concentrated juice, freeze-dried powder, and beetroot-infused baked goods are not nutritionally identical. Lab analysis comparing different beetroot preparations found that juice had the highest nitrate and sugar content, while chips and powder concentrated other compounds like organic acids and antioxidants.⁴ The bioactive compounds shift substantially depending on how the beet is processed, which means a juice trial and a raw-beet trial are testing somewhat different things.

Dose and duration vary wildly across studies too. Some trials ran for just two weeks, others for several months. The positive blood sugar trial used whole raw beetroot eaten regularly, while the negative trial used concentrated juice. And participant characteristics differ: one group’s average baseline glucose or medication regimen can easily obscure a small dietary effect that another group’s baseline would reveal. The honest takeaway is not that beetroot “works” or “doesn’t work” for blood sugar, but that the evidence is still too patchy to make a confident call.

Blood Pressure Is Where the Evidence Gets Stronger

If you shift the lens from glucose control to cardiovascular health, the picture becomes more encouraging. High blood pressure is extremely common in people with type 2 diabetes and is a major driver of heart disease, kidney damage, and stroke. Beetroot is one of the richest dietary sources of inorganic nitrate, which your body converts to nitric oxide, a molecule that relaxes blood vessels.

In a trial of people with type 2 diabetes, nitrate supplementation dropped systolic blood pressure from around 148 to 142 mmHg, while the placebo group barely moved. Central blood pressure, the pressure your aorta and major organs actually experience, also fell, from roughly 131 to 127 mmHg. The placebo group saw no change. The study also found improvement in arterial stiffness, a measure tied to long-term cardiovascular risk.⁵

That said, not every blood pressure trial has been positive. Another study giving beetroot juice for two weeks at a slightly lower nitrate dose found no change in ambulatory blood pressure, endothelial function, or insulin sensitivity.⁶ The difference could come down to the dose of nitrate delivered and whether it crossed the threshold needed to affect blood vessels in people whose diabetes has already impaired nitric oxide signaling. People with diabetes tend to have reduced nitric oxide availability at baseline, which makes it plausible that higher nitrate doses might be needed to move the needle.

Benefits for Kidney Health

Kidney complications are one of the most feared consequences of long-term diabetes. A small pilot study in patients with chronic kidney disease found that a single high-nitrate beetroot juice dose lowered mean arterial pressure by about 8 mmHg compared to roughly 2 mmHg in the control group. It also reduced the renal resistive index, a measure of blood flow resistance in the kidneys, suggesting the vessels feeding the kidneys relaxed and allowed better perfusion.⁷ This is a small, short-term study, but the combination of lower blood pressure and improved kidney blood flow is exactly the kind of outcome nephrologists care about in diabetes patients.

Inflammation and Liver Protection

Chronic low-grade inflammation is a hallmark of type 2 diabetes and drives many of its complications. Several lines of evidence suggest beetroot compounds can tamp down inflammatory markers. In one clinical comparison, beetroot juice reduced levels of key inflammatory signals: IL-6, TNF-alpha, and NF-kB all dropped substantially compared to controls.⁸ Those three molecules are central players in the chronic inflammation that damages blood vessels, nerves, and organs in diabetes.

Animal studies have pushed the investigation further, particularly around liver health. Non-alcoholic fatty liver disease is tightly linked to type 2 diabetes, and beetroot extract given to diabetic rats improved liver structure, reduced fat accumulation in liver tissue, and lowered blood glucose and insulin levels. Markers of liver damage also dropped, while antioxidant defenses in the liver went up.⁹ The human trial that used raw beetroot also reported reduced liver enzyme levels (AST and ALT), which aligns with the animal data suggesting liver-protective effects.¹

The pigment responsible for beetroot’s deep red color, betanin, appears to be a key player. In diabetic rats, betanin activated AMPK (an enzyme that acts as a cellular energy sensor) and SIRT1 (a protein involved in metabolic regulation) while turning down NF-kB, the master switch for inflammatory gene activity, in both blood and liver tissue.¹⁰ A review of the evidence has connected betanin’s antioxidant properties to the reduced HbA1c levels seen in some human trials, proposing that its ability to counteract the damaging chemical reactions that sugar triggers in the bloodstream may partly explain the glucose-related benefits.⁸ These are reasonable mechanisms, though the animal-to-human translation remains uncertain.

Exercise Performance in Diabetes

Beetroot juice has become popular among athletes for its potential to improve exercise efficiency, so researchers tested whether the same benefit might help people with type 2 diabetes who often struggle with reduced exercise capacity. A randomized crossover trial measured the oxygen cost of walking and performance in a six-minute walk test after beetroot juice versus placebo. The result was a clear null: no difference in how much oxygen the body used during moderate walking, and no improvement in walking distance.¹¹ Whatever benefits beetroot nitrate provides to healthy athletes’ muscles does not seem to carry over to exercise performance in people with type 2 diabetes, at least at the doses and durations tested so far.

Your Mouth Bacteria Matter More Than You Think

One of the more unexpected findings in this field involves the bacteria living on your tongue. Beetroot’s nitrate only becomes useful after oral bacteria convert it to nitrite, which then gets absorbed into the bloodstream and eventually becomes nitric oxide. An intriguing study tested what happens when you drink beet juice alongside a carbohydrate load while using antibacterial mouthwash that kills those tongue bacteria.

In non-obese adults, the mouthwash made no difference. But in obese adults, disrupting oral bacteria with mouthwash actually reduced insulin sensitivity.¹² The implication is that oral bacteria play an active role in metabolic health, and that regular use of strong antibacterial mouthwash could undermine some of the benefits people are trying to get from nitrate-rich foods. If you are drinking beetroot juice partly for its nitrate content, aggressive mouthwash use might be working against you. Researchers have also developed guidance on nitrate intake from different vegetables to help people reach a beneficial dose without overdoing it.¹³

How Cellular Mechanisms Tie Together

If you zoom in on what beetroot compounds are doing at the cellular level, there are at least two separate pathways that could help in diabetes. One involves nitrate’s effect on muscle cells. Lab research on muscle tissue found that beetroot promoted expression of GLUT4, the protein responsible for transporting glucose from the bloodstream into muscle cells. The researchers speculated that nitrate-treated muscle cells could have enhanced glucose uptake and improved insulin sensitivity, though they were careful to note this has not yet been confirmed in living organisms.¹⁴

The other pathway runs through betanin’s anti-inflammatory action described earlier. Diabetes involves a vicious cycle where high blood sugar increases inflammation, which in turn worsens insulin resistance, which pushes blood sugar higher. Betanin’s ability to activate AMPK and suppress NF-kB could theoretically interrupt this loop at multiple points. The combination of nitrate working on blood vessels and muscles while betanin works on inflammation and oxidative damage makes beetroot an unusually multifaceted food from a biochemistry standpoint. But “multifaceted in the lab” does not automatically translate to “clinically effective at the dinner table.”

Practical Considerations for People With Diabetes

Beetroot is not a low-sugar vegetable. A medium-sized cooked beet contains roughly 8 to 9 grams of natural sugar, and beetroot juice concentrates that sugar further. For people carefully managing carbohydrate intake, this matters. Juice especially can deliver a quick sugar load that feels counterproductive. The glycemic index of whole beetroot is moderate (around 61), but combining it with other ingredients can change that substantially. Biscuits enriched with beetroot powder, for instance, had a glycemic index of about 49, which puts them in the low-GI category.¹⁵ So the delivery method shapes the glycemic impact.

Beetroot is also high in oxalates, which can be a concern for people prone to kidney stones. Given that kidney health is already a focus for many people with diabetes, this is worth being aware of. Cooking reduces oxalate content somewhat, and eating beetroot as part of a calcium-containing meal can help bind oxalates in the gut before they reach the kidneys.

If you take blood pressure medication, adding a potent source of nitric oxide could theoretically push your blood pressure lower than intended, especially if you are already well-controlled. This is not a widely documented interaction with dietary beetroot at normal food amounts, but concentrated beetroot juice supplements deliver much higher nitrate loads than a side dish of roasted beets. If you are on antihypertensive medication, it makes sense to mention your beetroot juice habit to your doctor, especially if you are using the concentrated “shots” marketed to athletes.

Beetroot and the Gut Microbiome

An emerging area of research looks at how beetroot might influence diabetes through changes to gut bacteria. A review of the current evidence has proposed that beetroot’s fiber and polyphenol content could shift the gut microbiome in ways that improve metabolic health, potentially through increased production of short-chain fatty acids that help regulate blood sugar and reduce gut inflammation.⁸ The gut connection is still largely theoretical and based on indirect evidence, but it adds another layer to why beetroot’s effects might go beyond what any single compound can explain. The fiber in whole beetroot feeds beneficial bacteria in ways that juice alone cannot, which is one more reason that the form you choose likely changes what you get from it.

The gut angle also ties back to the oral bacteria finding. The entire chain from mouth to gut to bloodstream participates in converting dietary nitrate into bioactive nitric oxide. Anything that disrupts that chain, whether it is antibacterial mouthwash, low stomach acid from proton pump inhibitors, or an imbalanced gut microbiome, could blunt the cardiovascular benefits that beetroot’s nitrate content would otherwise provide. For people with diabetes, whose metabolic pathways are already under stress, keeping these conversion pathways functional may be part of what determines whether beetroot supplements deliver real benefits or fall flat.