Sanchis, P. (Autor de correspondencia); Prieto, R. M.; Konieczna, J.; Grases, F.; Abete Goñi, Itziar
; Salas-Salvado, J.; Martín, V.; Ruiz-Canela, Miguel
; Babio, N.; Garcia-Gavilan, J. F.; Goday, A.; Costa-Bauza, A.; Martínez Hernández, Alfredo
; Romaguera, D. (Autor de correspondencia)
The main objective of this work was to explore the association of dietary phytate intake with bone mineral density (BMD) in a Mediterranean population of postmenopausal women. For this purpose, a cross-sectional analysis of 561 women aged 55-75 years with overweight/obesity and metabolic syndrome from a Mediterranean area and with data on dual-energy X-ray absorptiometry (DXA) scans in femur and lumbar spine was performed. Estimated phytate intake was calculated using a validated food frequency questionnaire. Our results indicated that phytate intake was associated with BMD [beta(95%CI) per each 25 mg/100 kcal] in femoral neck [0.023(0.060-0.040) g/cm(2)], femoral Ward's triangle [0.033(0.013-0.054) g/cm(2)], total femur [0.018(0.001-0.035) g/cm(2)], and all the analyzed lumbar spine sites [L1-L4: 0.033(0.007-0.059) g/cm(2)] after adjusting for potential confounders. The sensitivity analysis showed that phytate intake was directly associated with lumbar spine BMD in women younger than 66 years, with a body mass index higher than 32.6 kg/cm(2) and without type 2 diabetes (all p-for interactions < 0.05). The overall results indicated that phytate, a substance present in food as cereals, legumes and nuts, was positively associated with BMD in Mediterranean postmenopausal women. Phytate may have a protective effect on bone resorption by adsorbing on the surfaces of HAP. Nevertheless, large, long-term, and randomized prospective clinical studies must be performed to assess the possible benefits of phytate consumption on BMD in postmenopausal women.