Reviewed by the Help Dementia Editorial Team — our editors review every article for accuracy against guidance from the National Institute on Aging, the Alzheimer’s Association, and peer-reviewed sources.
Eating more sits at the center of this dementia and brain health question.
The claim that a seven-year study proves eating more beets cuts dementia risk circulates widely online, but the reality of the research is more nuanced. While emerging evidence suggests beets may support brain health through improved blood flow and oxidative stress reduction, no definitive long-term clinical trial in humans has conclusively demonstrated that beet consumption prevents or reduces dementia risk. The actual science shows promise in specific mechanisms—particularly through dietary nitrates that expand blood vessels—but current research remains preliminary and falls short of the dramatic conclusions often promoted in popular health articles. What researchers have found is encouraging but incomplete.
Studies on beet juice supplementation show improvements in blood flow to the prefrontal cortex, the brain region commonly affected in dementia-related degeneration. However, when scientists tested whether these improvements translated to measurable cognitive benefits, results were mixed. A 13-week trial of 62 older adults (aged 60-75) found that beetroot juice supplementation did not significantly improve cognitive function, despite increases in some blood flow markers. This gap between mechanism and actual cognitive outcome is critical to understand.
Table of Contents
- What Does the Research Actually Show About Beets and Brain Health?
- The Betanin Compound and Oxidative Stress—Laboratory Findings vs. Real-World Impact
- Brain Blood Flow Studies—The Strongest Evidence, Still Limited
- The Missing Long-Term Evidence and Study Duration Problem
- Mixed Results from the Most Rigorous Available Trial
- Practical Considerations for Including Beets in Your Diet
- What Future Research Needs to Determine
- Conclusion
What Does the Research Actually Show About Beets and Brain Health?
The most solid evidence comes from a study at Wake Forest University demonstrating that older adults consuming a high-nitrate diet showed increased blood flow specifically to the white matter of the frontal lobes—areas typically affected by age-related cognitive decline. Beets rank among the highest dietary sources of nitrates, containing approximately 250-350 mg per 100 grams of cooked beetroot. When you consume beets, your body converts these nitrates into nitric oxide, a signaling molecule that relaxes blood vessel walls and allows more oxygen-rich blood to reach brain tissue.
This mechanism is biologically sound and measurable. Unlike vague claims about “brain health,” the nitrate-to-nitric oxide pathway is documented and reproducible in laboratory settings. However, the jump from “improved blood flow to the prefrontal cortex” to “prevents dementia” is significant and not yet supported by human evidence. A comparison: showing that a medication improves blood pressure is not the same as showing it prevents heart attacks—the downstream health outcome requires separate, longer-term validation.
The Betanin Compound and Oxidative Stress—Laboratory Findings vs. Real-World Impact
A separate line of research focused on betanin, a pigmented compound in beets, found remarkable results in laboratory conditions. Researcher Li-June Ming at the University of South Florida exposed beta-amyloid proteins—the toxic accumulations linked to Alzheimer’s disease—to betanin extract in test tubes. The results showed up to 90% reduction in oxidation. This was exciting enough to generate headlines: “Vegetable Compound Could Have a Key Role in Beating Alzheimer’s Disease.” But here lies a critical limitation that deserves your attention: test-tube studies using isolated compounds do not predict what happens in the human body.
Betanin must survive stomach acid, be absorbed through the intestinal wall, cross the blood-brain barrier, and reach beta-amyloid deposits in meaningful concentrations. None of these steps has been validated in human subjects. The leap from “compound reduces oxidation of isolated proteins in a lab dish” to “eating beets prevents Alzheimer’s” involves multiple unproven assumptions. This is why pharmaceutical companies spend years testing drugs that work perfectly in the lab but fail in human trials.
Brain Blood Flow Studies—The Strongest Evidence, Still Limited
The most compelling human research on beets and cognition comes from the blood flow studies. Older adults supplemented with beetroot juice showed measurable increases in oxygenation to brain tissue, particularly in the prefrontal cortex. This region handles executive function, decision-making, and memory—all areas compromised by dementia. The physiological effect is real and reproducible.
However, when researchers followed up with cognitive testing, the picture became less clear. In one 13-week randomized trial, older adults with high blood pressure who consumed beetroot juice daily showed improved blood flow markers but did not demonstrate measurable improvements in memory, processing speed, or other cognitive measures compared to the control group. This disconnect—between improved blood flow and unchanged cognitive performance—suggests that blood flow improvement alone may not be sufficient to prevent or slow cognitive decline. The brain is a complex system where blood flow is necessary but not sufficient for maintaining cognitive function.
The Missing Long-Term Evidence and Study Duration Problem
Here’s where the “seven-year study” claim becomes problematic: the longest clinical trials examining beets and cognition are 13 weeks. Thirteen weeks. Dementia develops over years and decades, involving slow accumulation of amyloid proteins, tau tangles, neuroinflammation, and neurodegeneration. A three-month study, even a well-designed one, cannot possibly demonstrate whether a dietary intervention prevents a disease that takes 10-20 years to manifest.
This is not unique to beet research—it reflects a broader challenge in nutrition science. Dietary interventions require either very long follow-up periods (expensive and difficult to maintain) or proxy measures (like blood flow or biomarker changes) that may not fully predict clinical outcomes. The Mediterranean diet, which has stronger evidence for cognitive benefits, was studied over periods of 3-4 years in large populations, and researchers still debate whether observed benefits come from the diet itself or from the overall healthier lifestyle of people who follow it. Beets have not yet received even this level of long-term investigation.
Mixed Results from the Most Rigorous Available Trial
The strongest test of beetroot’s cognitive effects came in a 2022 randomized, double-blind, placebo-controlled trial published in a peer-reviewed journal—the gold standard for clinical research. Researchers recruited 62 overweight and obese older adults (average age 67 years) and gave half of them concentrated beetroot juice daily while the other half received a placebo. At 13 weeks, the beetroot group showed no significant improvements in cognitive function, no significant improvements in cerebral blood flow compared to placebo, and no differences in processing speed or memory.
This negative result is important to highlight because it contradicts the optimistic narrative in popular health media. Some readers may have already encountered claims that beet juice “boosts brain power” or “reduces dementia risk”—those claims significantly overstate the current evidence. The honest interpretation is that while beets contain compounds with theoretical neuroprotective properties, we have no solid proof that eating or drinking them prevents cognitive decline in real people over meaningful timeframes.
Practical Considerations for Including Beets in Your Diet
Despite the research limitations, beets remain a nutritious vegetable worth including in a brain-healthy diet for multiple reasons beyond dementia prevention. Raw beets contain vitamin C, folate, and manganese; cooked beets retain most of their nitrate content. Beetroot juice concentrates these compounds and may be practical for older adults with chewing or swallowing difficulties. A typical serving of cooked beets is about one-half cup daily, or 70-100 mg of concentrated beetroot juice powder mixed with water.
If you choose to incorporate beets, understand that they work best as part of a broader dietary pattern, not as a standalone “brain food.” The Mediterranean and MIND diets—which have stronger evidence for cognitive protection—emphasize leafy greens (also high in nitrates), fish, nuts, and whole grains. Beets fit naturally into these patterns. One realistic example: swapping a processed snack for a small beet salad provides both the nitrate benefit and the displacement of a less healthy option. That’s a genuine win, even if beets alone aren’t a dementia cure.
What Future Research Needs to Determine
The next logical step would be a multi-year randomized trial following cognitively normal older adults who consume beets regularly versus those who don’t, measuring cognitive decline over 5-10 years. Such a study would be expensive and difficult to conduct—maintaining dietary compliance in a free-living population is notoriously challenging—but it’s what would actually answer whether the blood flow improvements seen in short-term studies translate to dementia prevention.
We also need research on whether beets help people who already have mild cognitive impairment or early-stage Alzheimer’s disease. All current evidence comes from cognitively normal older adults, so we don’t know if beets could slow progression once the disease process has started. Until such studies exist, honest health communication should distinguish between “beets have compounds that theoretically could protect the brain” and “eating beets prevents dementia.”.
Conclusion
The evidence that eating more beets cuts dementia risk, based on the scientific literature available today, is not as strong as headlines suggest. While beets contain nitrates that improve blood flow to aging brains, and compounds that reduce oxidation in laboratory conditions, human clinical trials have not demonstrated cognitive benefits even over periods as short as 13 weeks. No seven-year study exists proving dementia prevention.
The research remains promising but preliminary. Your best approach is to view beets as a nutritious addition to a brain-healthy diet pattern—the Mediterranean or MIND diet—rather than as a standalone dementia preventive. Consult with your healthcare provider about what dietary changes make sense for your individual health situation, especially if you have risk factors for cognitive decline or are concerned about family history of dementia. Honest science communication means acknowledging both what we know (beets improve brain blood flow) and what we don’t (whether this prevents dementia in real people over meaningful timeframes).
You Might Also Like
- Eating More wild blueberries Cuts Dementia Risk According to 10 Year Study
- Eating More walnuts Cuts Dementia Risk According to 5 Year Study
- Eating More turmeric Cuts Dementia Risk According to 7 Year Study
For more, see Alzheimer’s Association.
