TY - JOUR
T1 - Soy isoflavone supplementation and bone mineral density in menopausal women
T2 - A 2-y multicenter clinical trial
AU - Wong, William W.
AU - Lewis, Richard D.
AU - Steinberg, Francene M.
AU - Murray, Michael J.
AU - Cramer, Margaret A.
AU - Amato, Paula
AU - Young, Ronald L.
AU - Barnes, Stephen
AU - Ellis, Kenneth J.
AU - Shypailo, Roman J.
AU - Fraley, J. Kennard
AU - Konzelmann, Karen L.
AU - Fischer, Joan G.
AU - Smith, E. O.Brian
PY - 2009/11/1
Y1 - 2009/11/1
N2 - Background: Isoflavones are naturally occurring plant estrogens that are abundant in soy. Although purported to protect against bone loss, the efficacy of soy isoflavone supplementation in the prevention of osteoporosis in postmenopausal women remains controversial. Objective: Our aim was to test the effect of soy isoflavone supplementation on bone health. Design: A multicenter, randomized, double-blind, placebo-controlled 24-mo trial was conducted to assess the effects of daily supplementation with 80 or 120 mg of soy hypocotyl aglycone isoflavones plus calcium and vitamin D on bone changes in 403 postmenopausal women. Study subjects were tested annually and changes in whole-body and regional bone mineral density (BMD), bone mineral content (BMC), and T scores were assessed. Changes in serum biochemical markers of bone metabolism were also assessed. Results: After study site, soy intake, and pretreatment values were controlled for, subjects receiving a daily supplement with 120 mg soy isoflavones had a statistically significant smaller reduction in whole-body BMD than did the placebo group both at 1 y (P < 0.03) and at 2 y (P < 0.05) of treatment. Smaller decreases in whole-body BMD T score were observed among this group of women at 1 y (P < 0.03) but not at 2 y of treatment. When compared with the placebo, soy isoflavone supplementation had no effect on changes in regional BMD, BMC, T scores, or biochemical markers of bone metabolism. Conclusion: Daily supplementation with 120 mg soy hypocotyl iso-flavones reduces whole-body bone loss but does not slow bone loss at common fracture sites in healthy postmenopausal women. This trial was registered at clinicaltrials.gov as NCT00665860.
AB - Background: Isoflavones are naturally occurring plant estrogens that are abundant in soy. Although purported to protect against bone loss, the efficacy of soy isoflavone supplementation in the prevention of osteoporosis in postmenopausal women remains controversial. Objective: Our aim was to test the effect of soy isoflavone supplementation on bone health. Design: A multicenter, randomized, double-blind, placebo-controlled 24-mo trial was conducted to assess the effects of daily supplementation with 80 or 120 mg of soy hypocotyl aglycone isoflavones plus calcium and vitamin D on bone changes in 403 postmenopausal women. Study subjects were tested annually and changes in whole-body and regional bone mineral density (BMD), bone mineral content (BMC), and T scores were assessed. Changes in serum biochemical markers of bone metabolism were also assessed. Results: After study site, soy intake, and pretreatment values were controlled for, subjects receiving a daily supplement with 120 mg soy isoflavones had a statistically significant smaller reduction in whole-body BMD than did the placebo group both at 1 y (P < 0.03) and at 2 y (P < 0.05) of treatment. Smaller decreases in whole-body BMD T score were observed among this group of women at 1 y (P < 0.03) but not at 2 y of treatment. When compared with the placebo, soy isoflavone supplementation had no effect on changes in regional BMD, BMC, T scores, or biochemical markers of bone metabolism. Conclusion: Daily supplementation with 120 mg soy hypocotyl iso-flavones reduces whole-body bone loss but does not slow bone loss at common fracture sites in healthy postmenopausal women. This trial was registered at clinicaltrials.gov as NCT00665860.
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U2 - 10.3945/ajcn.2009.28001
DO - 10.3945/ajcn.2009.28001
M3 - Article
C2 - 19759166
AN - SCOPUS:70350637278
SN - 0002-9165
VL - 90
SP - 1433
EP - 1439
JO - American Journal of Clinical Nutrition
JF - American Journal of Clinical Nutrition
IS - 5
ER -