Growth, bone mass, and vitamin D status of Chinese adolescent girls 3 y after withdrawal of milk supplementation1–3
Background: A 2-y school milk intervention trial showed that 330 mL of a dietary milk supplement (fortified with calcium alone or with both calcium and vitamin D) enhanced the growth and bone mineral accretion of Chinese girls aged 10 y at baseline. Girls who received milk fortified with both ca...
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| Main Authors: | , , |
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| Format: | Article |
| Published: |
American Society for Nutrition
2006
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| Subjects: | |
| Online Access: | http://eprints.usm.my/36276/ http://ajcn.nutrition.org/content/83/3/714.full |
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| Summary: | Background: A 2-y school milk intervention trial showed that 330
mL of a dietary milk supplement (fortified with calcium alone or
with both calcium and vitamin D) enhanced the growth and bone
mineral accretion of Chinese girls aged 10 y at baseline. Girls who
received milk fortified with both calcium and vitamin D also had
better vitamin D status than did girls who received nothing or girls
who received milk fortified only with calcium.
Objective: The aim was to evaluate whether these effects were
sustained 3 y after supplement withdrawal.
Design: Anthropometric measures and dietary intake were reassessed
in 501 of the 698 girls whose data had been studied at the end of
the intervention. As in the intervention phase, total-body bone mineral
content and bone mineral density and serum 25-hydroxyvitamin D
concentrations were measured in half of these subjects.
Results: At follow-up,99%of girls had reached menarche, at a mean
(SD) menarcheal age of 12.11.1 y. No significant differences in
the timing of menarche were observed between the 3 groups (P
0.6). No significant differences in the changes of total-body bone
mineral content and bone mineral density since baseline were observed
between the groups. The group receiving calcium-fortified
milk had significantly greater gains in sitting height (0.9 0.3%;
P 0.02) than did the control group. The group that received
calcium- and vitamin D–fortified milk had 17.16.7% lower serum
25-hydroxyvitaminDconcentrations than did the control group (P
0.04), but the difference was attenuated by additional adjustment for
physical activity level (14.2 6.7%; P 0.08).
Conclusion: Milk supplementation during early puberty does not
have long-lasting effects on bone mineral accretion. |
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