Can the DASH Diet Lower Uric Acid? What the Trial Actually Found
Most of what people believe about diet and uric acid comes from observational studies — large cohorts tracking what people eat and who develops gout. Valuable, but observational work has a permanent ceiling: it can show that two things travel together, never that one causes the other. That is what makes a feeding trial special. In 2016, a team at Johns Hopkins published results from an ancillary study of the DASH-Sodium trial, where researchers controlled what participants ate, meal by meal, and measured serum uric acid before and after. It is one of the few places in the gout-diet literature where cause-and-effect claims have any footing at all.
The headline result: the DASH diet lowered uric acid. The details underneath that headline — including a genuine surprise about salt — are this article's subject. We are a data and editorial team summarizing published research, not a medical team, and the original paper is cited in full at the end.
What DASH Is, in One Paragraph
DASH — Dietary Approaches to Stop Hypertension — was built in the 1990s to lower blood pressure, and its architecture has aged well: abundant fruits and vegetables, whole grains, low-fat dairy as a deliberate protein pillar, reduced saturated fat, and moderate amounts of lean meats, fish, nuts, and legumes. Nothing about it was designed for gout. Low-fat dairy and plant-forward eating happened to sit in exactly the territory that gout cohort research had flagged as favorable, which is what made testing DASH against uric acid worth doing.
How the Feeding Trial Worked
The parent DASH-Sodium trial was a randomized, crossover feeding study — the design that sits at the top of the diet-research hierarchy because the investigators, not the participants, control the food.
- Participants: 103 adults with prehypertension or stage 1 hypertension. Fifty-five percent were women, 75 percent were Black participants, mean age about 51.5 years, and mean baseline serum uric acid 5.0 mg/dL — a generally healthy group, not a gout clinic.
- Feeding arms: each participant ate both the DASH diet and a control diet typical of the average American diet, in randomized order.
- Sodium arms: within each diet, participants were fed low, medium, and high sodium levels for 30 days each, in random order. Body weight was held constant throughout — a critical detail, because weight change moves uric acid on its own and would have contaminated the results.
- Measurement: serum uric acid at baseline and after each feeding period, with every meal provided and controlled by the research kitchen.
The crossover structure means each participant served as their own comparison, and the controlled-feeding design removes the self-report error that haunts food questionnaires. When this study reports a uric acid difference, the food difference is known exactly.
Finding 1: DASH Lowered Uric Acid — and More Where It Mattered
Across all participants, the DASH diet reduced serum uric acid by 0.35 mg/dL relative to the control diet — a modest but statistically solid effect. The subgroup result is the one that mattered clinically: among the small number of participants who started with uric acid at or above 7 mg/dL — the concentration where urate begins forming crystals and where gout lives — the DASH diet's effect was far larger, an average reduction of 1.29 mg/dL.
That pattern — small average effect, large effect where the baseline is high — has a shape worth noticing. It suggests the diet does not simply nudge everyone down uniformly; it does its most visible work among people with the most urate to move. The subgroup was tiny (eight participants), so the confidence interval was wide, and the authors were appropriately careful about it. But the direction matched what the observational literature predicted, and the effect size in the hyperuricemic subgroup approached what urate-lowering drugs achieve — from food alone.
Finding 2: The Salt Result Nobody Predicted
The sodium arm produced the surprise. The working hypothesis going in was that more salt would mean more uric acid, or at least no relationship. The data said the opposite: increasing sodium intake above the low-sodium level decreased serum uric acid — by about 0.3 mg/dL at medium sodium and 0.4 mg/dL at high sodium, both statistically strong.
Before anyone reaches for a salt shaker as a gout strategy, the study's own interpretation matters: the mechanism is unclear, the effect is understood as a physiologic observation about urate handling rather than a health recommendation, and the known harms of high sodium intake — blood pressure among them — did not go away. The finding earned its place in the literature as a window into urate pathophysiology: the kidney handles sodium and urate through overlapping transport machinery, and the trial demonstrates that the relationship is more complicated than "salt bad, urate bad." It is a finding about how the body works, not about what a healthy diet contains.
What This Study Did Not Show
- Gout outcomes. The endpoint was serum uric acid, not flares, not new gout diagnoses, not crystal burden. Whether the observed urate reduction translates into fewer flares was not tested here. A later cohort analysis — Rai and colleagues in 2017, following more than 44,000 men — reported that higher DASH adherence was associated with lower risk of developing gout, which points the same direction, but it is observational support, not trial proof.
- A gout population. Participants had prehypertension or stage 1 hypertension and a mean uric acid of 5.0 mg/dL. Only eight crossed the 7 mg/dL line. Results in a gout clinic population could differ in both directions.
- Long-term maintenance. Each feeding period lasted 30 days in a controlled kitchen. Real-world DASH adherence, sustained for years with people cooking for themselves, is a different experiment.
- Diet components in isolation. DASH is a package. The trial cannot say whether the effect came from the dairy, the produce, the reduced saturated fat, or the pattern as a whole — and any attempt to extract "the gout part" of DASH is extrapolation.
Where This Leaves the DASH Question
The trial answered its own question cleanly: a dietary pattern built for blood pressure also moves uric acid, in the favorable direction, under conditions tight enough to support causal language — rare currency in nutrition research. Combined with the cohort evidence that DASH adherence tracks with lower gout risk, the reasonable reading is that DASH is among the best-evidenced dietary patterns a uric-acid-conscious reader could consider discussing with their clinician — with the caveats above attached.
It is also worth registering what kind of evidence this is, because the gout-diet field runs mostly on weaker designs. Cohort studies observe eaters; feeding trials feed them. When both designs point the same direction — as they do here, and as they did for the plant-versus-animal purine distinction — the conclusion rests on a much firmer floor than either line alone. That convergence, more than any single risk ratio, is why DASH earned its place in gout diet conversations.
The DASH story also connects backward through the research lineage this site covers: the dairy pillar echoes the protective dairy finding in the 2004 NEJM purine study, and the plant-forward architecture aligns with the legume findings in our beans myth breakdown. Converging lines of evidence from different designs is what a settled question looks like.
Frequently Asked Questions
Across all 103 participants, DASH reduced serum uric acid by about 0.35 mg/dL versus a typical American control diet. Among the few participants starting at 7 mg/dL or above, the average reduction was 1.29 mg/dL — the diet's largest effect appeared exactly where urate was highest.
No. The trial observed that higher sodium intake coincided with lower uric acid, but the researchers themselves flagged the mechanism as unclear and the finding as physiological insight, not dietary advice. High sodium intake carries well-established harms, and no health authority recommends adding salt for urate reasons.
The trial evidence supports DASH's pattern — fruits, vegetables, whole grains, low-fat dairy, moderated meat — while the traditional low-purine approach of banning all purine foods has been undermined by cohort research showing plant purines behave differently. The two are not equally supported by modern data.
No. It measured serum uric acid over 30-day feeding periods in people without diagnosed gout. Lower urate is plausibly connected to fewer flares, but the trial did not measure flares, and extending the result to flare prevention is inference, not a demonstrated finding.
References
- Juraschek SP, Gelber AC, Choi HK, Appel LJ, Miller ER III. Effects of the Dietary Approaches to Stop Hypertension (DASH) Diet and Sodium Intake on Serum Uric Acid. Arthritis & Rheumatology, 2016;68(12):3002-3009. doi.org/10.1002/art.39813 · PMID 27523583 · Trial registration NCT00000608
- Rai SK, Fung TT, Lu N, Keller SF, Curhan GC, Choi HK. Prospective analysis of the DASH diet, Western diet, and risk of gout in men. Arthritis & Rheumatology, 2017.
FAQs
Across all 103 participants, DASH reduced serum uric acid by about 0.35 mg/dL versus a typical American control diet. Among the few participants starting at 7 mg/dL or above, the average reduction was 1.29 mg/dL — the diet's largest effect appeared exactly where urate was highest.
No. The trial observed that higher sodium intake coincided with lower uric acid, but the researchers themselves flagged the mechanism as unclear and the finding as physiological insight, not dietary advice. High sodium intake carries well-established harms, and no health authority recommends adding salt for urate reasons.
The trial evidence supports DASH's pattern — fruits, vegetables, whole grains, low-fat dairy, moderated meat — while the traditional low-purine approach of banning all purine foods has been undermined by cohort research showing plant purines behave differently. The two are not equally supported by modern data.
No. It measured serum uric acid over 30-day feeding periods in people without diagnosed gout. Lower urate is plausibly connected to fewer flares, but the trial did not measure flares, and extending the result to flare prevention is inference, not a demonstrated finding.
References
- Juraschek SP, Gelber AC, Choi HK, Appel LJ, Miller ER III. Effects of the Dietary Approaches to Stop Hypertension (DASH) Diet and Sodium Intake on Serum Uric Acid. Arthritis & Rheumatology, 2016;68(12):3002-3009. doi.org/10.1002/art.39813 · PMID 27523583 · Trial registration NCT00000608
- Rai SK, Fung TT, Lu N, Keller SF, Curhan GC, Choi HK. Prospective analysis of the DASH diet, Western diet, and risk of gout in men. Arthritis & Rheumatology, 2017.