and transport as well as direct effects on hematopoi-esis in the presence of adequate iron stores.

VA deficiency decelerates growth in animals and has been associated with both stunting and wasting malnutrition in children, possibly reflecting roles for the vitamin in osteogenesis and protein metabolism. Trials, however, have shown inconsistent effects of VA supplementation on child growth, possibly due to variations in the extent of infection, season-ality in dietary protein and energy adequacy, exclusion criteria, and levels of VA status among study children. It appears that VA supplementation can influence ponderal and linear growth, as well as body composition, in children for whom VA deficiency is a 'growth limiting' nutritional deficit.

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