2078-P: Association of Dietary Intake of Phosphorus with Obesity in Japanese Patients with Type 2 Diabetes Mellitus (T2DM)

Although serum phosphate concentrations have been consistently reported to have a negative correlation with BMI, there have been some conflicting reports of the relationship of dietary intake of phosphorus with BMI. Thus, we investigated the association between phosphorus intake and obesity in Japanese patients with diabetes mellitus. Analyzed were 1891 patients with T2DM (mean age, 62 y; men, 62%) in our nationwide registry who had completed a food frequency questionnaire. Obesity was defined according to BMI >25. The association between phosphorus intake and obesity was determined by multivariate regression as well as quintile analyses. Mean daily intake of phosphorus was 996 mg in men and 977 mg in women, values that were quite close to those of the general population in Japan. Intake of phosphorus was significantly associated with decreased risk of obesity with an odds ratio (OR) of 0.90 (0.87-0.94) per 50 mg increase in phosphorus intake. Quintile analysis revealed potent negative correlations in both men and women (Table). Food groups strongly associated with phosphorus among our patients were fish (0.58), dairy products (0.54) and beans (0.52). These results imply the clinical relevance of controlling phosphorus intake as part of medical nutrition therapy for patients with T2DM.