Beets for Endurance Athletes Over 50
Vegetable Review of the Month-October
Beets for endurance athletes are one of the few foods with a real physiological mechanism behind their reputation, and that mechanism matters more, not less, after 50. The reason is nitrate, a compound beets carry in unusually high amounts, which your body converts into nitric oxide, a molecule that relaxes blood vessels and changes how efficiently your muscles use oxygen.
For masters endurance athletes, those are two of the systems that drift with age: vascular function and oxygen economy. This post covers what the evidence supports, where it is thin, and how to use beets sensibly without turning a vegetable into a miracle claim.
For endurance athletes, especially those over 50, incorporating beets into their diet can be beneficial due to their unique properties.
How beets work: the nitrate to nitric oxide pathway
Dietary nitrate becomes nitric oxide through a short chain of steps. Bacteria on the back of the tongue reduce nitrate to nitrite, stomach acid and tissues convert nitrite to nitric oxide, and that nitric oxide widens blood vessels and improves blood flow. This route works even when oxygen is scarce, which is exactly the situation in hard-working muscle. About 20 to 25 percent of absorbed nitrate is recirculated through the salivary glands, so the system keeps feeding itself for hours.
The practical result in studies is a lower oxygen cost for the same workload. You do the same work while using less oxygen, which is what endurance athletes call economy (Beetroot Juice and Exercise for Clinical Health and Athletic Performance).
What the research shows, and where it stops
Endurance is the most consistent benefit: lower oxygen cost, better exercise economy, and improved time-trial or time-to-exhaustion results in many trials. Strength, sprint, and power outcomes are mostly unchanged. The evidence is not uniform either. In one severe-intensity cycling trial, time to exhaustion did not change at all.
Two caveats matter for a masters athlete. First, highly trained endurance athletes often show small or inconsistent gains, probably because their nitric oxide availability and mitochondrial efficiency are already high. Recreationally active people tend to show clearer improvements. Second, older adults can show a blunted nitrite response in some work, linked to faster nitric oxide scavenging, yet older adults with hypertension or impaired vessel function appear to benefit more than younger, healthy groups.
The honest summary is that beets are a low-risk, plausible aid with a real mechanism, not a guaranteed performance upgrade. A recent systematic review examines beetroot juice as a healthy aging strategy for physical performance and cognitive function, and is worth reading in full (Beetroot Juice Supplementation as a Healthy Aging Strategy).
Blood pressure and vascular health after 50
This is arguably the stronger case for the 50 plus athlete. A single dose is estimated to lower systolic blood pressure by about 5 to 10 mmHg, and in hypertensive adults, 14 days or more of daily intake gives more consistent reductions. Endothelial function, the ability of vessel walls to dilate, has improved after one to four weeks of intake in older adults.
The effect is smaller and more variable in people with normal blood pressure and in older adults already taking antihypertensive medication. Endurance training lowers cardiovascular risk on its own, but arterial stiffening and blood pressure creep are common in masters athletes, so a food-based vascular aid is a reasonable addition rather than a replacement for medical care.
How to use beets: dose, timing, and form
The studied range is roughly 5 to 9 mmol of nitrate. Common research protocols use 70 mL of concentrated juice (about 6.4 mmol) or 140 mL (about 12.8 mmol). Returns diminish at higher doses, so more is not better.
| Question | What the evidence suggests | Practical approach |
|---|---|---|
| Dose | 5 to 9 mmol nitrate | Check the label for nitrate content, since beet juice varies widely |
| Timing before a session or race | Nitrate and nitrite peak 2 to 3 hours after intake | Take it 2 to 3 hours before key workouts and events |
| Daily use | Effects fade within about 24 to 30 hours | Daily intake for blood pressure and vascular goals |
| Trial first | Responses vary person to person | Test in training, never for the first time on race day |
Concentrated juice shots deliver a standardized dose in a small volume, which is why most studies use them. Whole beets are fine for daily vascular support, but nitrate content varies by soil and preparation, so they are harder to dose. Habitually high intake of nitrate-rich vegetables may also blunt the extra benefit of a supplement.
Beyond performance: beets as part of an everyday diet
Most of the research tests concentrated juice, not a plate of beets, so treat the whole-food case as plausible rather than proven. The best evidence for adults 50 and older is a systematic review of 12 small crossover trials with 202 participants, using doses of about 6 to 12 mmol of nitrate per day.
Its findings were encouraging but mixed. Five of ten trials measuring blood pressure found a significant drop in systolic pressure, and five found no change. One study found higher frontal brain blood flow after two days on a high-nitrate diet, while two trials measuring cognition showed little or no clear benefit. Reported side effects were mild, mainly red urine and stools and occasional stomach discomfort, with no chronic adverse effects. Many participants were on blood pressure or diabetes medication, which may have masked effects, and they call for larger, better-controlled trials.
Outside the nitrate research, eating beets two or three times a week is a simple way to add fiber, potassium, folate, and colorful plant pigments called betalains to your diet. These nutrient points are general nutrition knowledge, not findings from the review above. The benefit is partly displacement: a beet salad takes the place of a lower-quality side, and a varied, plant-rich diet is itself well supported for heart and metabolic health.
What the evidence does not support is any claim that beets treat disease, replace medication, or reliably improve memory. Keep the framing modest, and this is a food worth including, not a cure.
Powders and supplements: what to look for on the label
Dried beet powders can raise nitrate intake, but products vary enormously. In one independent test, a single serving of beet products supplied anywhere from about 4 mg to nearly 500 mg of nitrate, and powders ranged from roughly 4 mg to 174 mg per 5 gram serving (ConsumerLab). Studies in older adults typically used about 300 to 600 mg of nitrate per day, so a powder at the low end would deliver almost none of it.
Nitrate is not a required line on a Supplement Facts panel, so many labels never state it. Federal rules for supplement manufacturing (21 CFR Part 111) set quality requirements for how products are made and tested, but they do not require a nitrate declaration, which leaves the checking to the buyer. A useful label or company will give you:
- Nitrate per serving in milligrams, on the label or in a certificate of analysis the company will share.
- Serving size in grams, so you can work out how many servings reach 300 to 600 mg.
- No proprietary blend that hides how much beet is actually in the product.
- Third-party testing for contaminants such as lead, plus a seal like NSF Certified for Sport if you compete in tested events.
- A lot number and a company willing to provide its testing records.
A powder is a convenient way to dose nitrate, not a replacement for whole beets, and the same cautions on medications, oxalate, and mouthwash apply.
Cautions worth knowing
Antibacterial mouthwash can markedly blunt the nitrite rise by killing the tongue bacteria the pathway depends on, so skip it in the hours around a dose. Thiocyanate in cruciferous vegetables such as broccoli and kale can compete with nitrate reduction, though the effect is weaker.
If you take blood pressure medication, nitrates, or erectile dysfunction drugs, talk with your physician first, since stacking vessel-relaxing agents can drop blood pressure further. Beets are also high in oxalate, so anyone with a history of kidney stones should ask before using concentrated products. Beeturia, pink or red urine, is harmless but startling, and some people get mild stomach upset from concentrated shots. These last points are general guidance rather than findings from the reviews cited here.
The bottom line
Beets are a sensible, low-cost tool for masters endurance athletes, especially for blood pressure and vascular health, with a plausible edge in exercise economy. Expect modest, individual results, test your dose in training, and keep it in context: sleep, training load, and medical care still do the heavy lifting.
Want to build a smarter plan around your own training? Explore more at solidtothecore.com.
Sources
- Beetroot Juice and Exercise for Clinical Health and Athletic Performance: A Narrative Review
- Beetroot Juice Supplementation as a Healthy Aging Strategy Through Improving Physical Performance and Cognitive Functions: A Systematic Review
- Dietary nitrate supplementation in adults aged 50 and older: a systematic review (Nutrients, 2017)
- ConsumerLab: Beetroot juice, powder, and chew supplements review
