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Br J Nutr. 2016 Feb 28;115(4):637-43. doi: 10.1017/S0007114515004766. Epub 2015 Dec 2.

Consumption of a calcium and vitamin D-fortified food product does not affect iron status during initial military training: a randomised, double-blind, placebo-controlled trial.

Author information

1
1Military Nutrition Division,United States (US) Army Research Institute of Environmental Medicine,Natick,MA 01760,USA.
2
2Military Performance Division,United States (US) Army Research Institute of Environmental Medicine,Natick,MA 01760,USA.
3
3Initial Military Training Center of Excellence,Fort Eustis,VA 23604,USA.

Abstract

Ca/vitamin D supplementation maintains bone health and decreases stress fracture risk during initial military training (IMT); however, there is evidence that Ca may negatively affect the absorption of other critical micronutrients, particularly Fe. The objective of this randomised, double-blind, placebo-controlled trial was to determine whether providing 2000 mg/d Ca and 25 µg/d vitamin D in a fortified food product during 9 weeks of military training affects Fe status in young adults. Male (n 98) and female (n 54) volunteers enrolled in US Army basic combat training (BCT) were randomised to receive a snack bar with Ca/vitamin D (n 75) or placebo (snack bar without Ca/vitamin D; n 77) and were instructed to consume 2 snack bars/d between meals throughout the training course. Circulating ionised Ca was higher (P0·05) in markers of Fe status between placebo and Ca/vitamin D groups. Collectively, these data indicate that Ca/vitamin D supplementation through the use of a fortified food product consumed between meals does not affect Fe status during IMT.

KEYWORDS:

BCT basic combat training; Bioavailability; Calcium/vitamin D supplementation; DMT1 divalent metal transporter 1; IMT initial military training; Iron deficiency; Minerals

PMID:
26625709
DOI:
10.1017/S0007114515004766
[Indexed for MEDLINE]

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