A large analysis of Chinese adults has uncovered a potentially important—and unexpected—link between dietary calcium intake and hyperuricemia, the condition in which uric acid accumulates in the bloodstream. Using data from the 2009 China Health and Nutrition Survey, researchers found that people consuming the highest amounts of calcium had significantly greater odds of hyperuricemia than those consuming the least. The finding challenges the common assumption that calcium-rich foods are automatically protective against metabolic disorders and raises new questions about how nutrients interact with uric acid regulation in populations whose diets are unusually low in calcium and heavily dependent on vegetables.
Hyperuricemia occurs when serum uric acid levels rise above the body’s ability to keep the compound dissolved and excrete it efficiently. Uric acid is the final product of purine metabolism in humans, and it is eliminated primarily through the kidneys, with a smaller contribution from the intestine. When concentrations become excessive, urate crystals may form in joints and tissues, contributing to gout. Persistent hyperuricemia is also associated with kidney disease, hypertension, cardiovascular disorders, insulin resistance and other metabolic problems, although the relationship is complex and does not mean that every person with elevated uric acid will develop symptoms.
The study included 7,606 Chinese adults between 18 and 94 years of age. Participants were drawn from the China Health and Nutrition Survey, a long-running project designed to capture dietary, lifestyle and health information across different regions of China. To estimate food consumption, the investigators used three consecutive 24-hour dietary recalls, a method in which participants report everything they ate and drank over three days. These records were combined with information on demographic characteristics, health conditions and other potential confounding factors before statistical analyses were performed.
The prevalence of hyperuricemia in the study population was 15.67 percent. The condition was considerably more common among men, affecting 20.21 percent, compared with 11.66 percent of women. At the same time, the median estimated calcium intake was only 352.87 milligrams per day, a relatively low amount compared with many dietary recommendations for adults. The participants were divided into five groups, or quintiles, according to their calcium consumption. This approach allowed the researchers to compare people at the lowest end of intake with those consuming progressively greater amounts.
The statistical pattern was striking. Compared with participants in the lowest calcium-intake group, individuals in the fourth group had 31 percent higher adjusted odds of hyperuricemia. Those in the highest-intake group had 55 percent higher odds. The trend remained statistically significant after adjustment for potential confounding variables, with a probability value for trend of 0.002. In practical terms, the analysis suggests that the association was not limited to one isolated category but generally became stronger as reported calcium intake increased.
The researchers also examined serum uric acid as a continuous measurement rather than simply classifying participants as having or not having hyperuricemia. Relative to the lowest calcium-intake group, people in the third group had serum uric acid levels that were approximately 7.57 units higher on average, while the increases reached 13.92 units in the fourth group and 14.76 units in the fifth group. The analysis indicated a clear positive dose-response relationship. A restricted cubic spline model, a statistical tool used to detect curved or changing associations, found no strong evidence that the relationship was substantially nonlinear, suggesting that the increase was broadly progressive rather than confined to a particular threshold.
The results do not prove that calcium itself causes hyperuricemia. Because the research used dietary and health information collected at one point in time, it was a cross-sectional study. Such studies can identify associations but cannot establish whether higher calcium intake preceded elevated uric acid or whether other factors influenced both. People who consumed more calcium may have differed from those in the lowest intake group in ways that were not fully measured. Their overall diets, use of supplements, body composition, kidney function, physical activity, socioeconomic status and patterns of meat, seafood, sugary beverage or alcohol consumption could all affect uric acid levels.
The authors describe the association as especially relevant to people who habitually consume low amounts of calcium, with vegetables serving as a major dietary source. This detail is important because calcium intake does not come from a single type of food. Calcium obtained from dairy products, fortified foods, supplements, leafy vegetables or other sources may be accompanied by very different combinations of protein, minerals, carbohydrates, purines and bioactive compounds. The body also absorbs calcium differently depending on the food matrix and the presence of substances such as oxalates and phytates. Consequently, the findings should not be interpreted as evidence that all calcium-containing foods have the same relationship with uric acid.
Several biological explanations are possible, although none was directly tested in the analysis. Calcium is involved in cellular signaling, muscle contraction and hormonal regulation, while urate handling depends heavily on transport proteins in the kidneys and intestine. Changes in renal function, fluid balance or mineral metabolism could theoretically influence uric acid concentrations. It is also possible that dietary calcium acted partly as a marker of broader eating patterns rather than as the direct driver of the association. For example, higher calcium intake from particular vegetable-based meals might coincide with other nutrients or dietary behaviors that affect urate metabolism. These possibilities will require controlled feeding studies, repeated dietary measurements and research that distinguishes calcium sources.
The findings arrive as hyperuricemia becomes an increasingly visible public-health concern in China and elsewhere. Urbanization, changing food habits, rising obesity rates, greater consumption of meat and sweetened beverages, and longer life expectancy have all contributed to growing interest in uric acid disorders. Yet the new study does not suggest that people should avoid calcium or reduce intake without medical advice. Calcium remains essential for bone health, nerve transmission and muscle function, and inadequate intake carries its own risks. Instead, the research highlights the danger of treating individual nutrients as isolated causes of disease and underscores the need to examine complete dietary patterns, kidney health and metabolic context. Future prospective studies will be needed to determine whether the observed relationship persists over time and whether it differs according to sex, age, calcium source, kidney function or genetic background. Until then, the study offers a provocative signal—not a dietary verdict—that the biology of calcium and uric acid may be more complicated than previously recognized.
Subject of Research: The relationship between dietary calcium intake, serum uric acid levels and hyperuricemia among Chinese adults.
Article Title: The association between dietary calcium intake and hyperuricemia among Chinese adults: results from the China Health and Nutrition Survey in 2009
Article References: Zhang, H., Sui, X., Gu, X. et al. “The association between dietary calcium intake and hyperuricemia among Chinese adults: results from the China Health and Nutrition Survey in 2009.” BMC Public Health (2026).
Image Credits: AI Generated
DOI: 10.1186/s12889-026-28767-2
Keywords: Hyperuricemia, dietary calcium, serum uric acid, China Health and Nutrition Survey, Chinese adults, cross-sectional study, nutrition, gout, epidemiology
