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Dairy Products, Exercise Raise Children's Vitamin D Levels

by Bidita Debnath on February 7, 2016 at 11:10 PM
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 Dairy Products, Exercise Raise Children's Vitamin D Levels

In primary school children, sufficient intake of fortified dairy products is of significant importance for the serum vitamin D level, shows a new study from the University of Eastern Finland.

Children who drink at least three glasses of milk per day had a higher serum vitamin D level than their peers who drink milk in lesser amounts. The use of vitamin D supplements was also associated with a higher serum vitamin D level. Furthermore, children who exercise more than 2 hours per day had a higher serum vitamin D level than children who exercise less than 1.5 hours per day. The article "Determinants of Serum 25-Hydroxyvitamin D Concentration in Finnish Children: The PANIC Study" was published online in British Journal of Nutrition and was selected as the Nutrition Society Paper of the Month for January 2016.

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Low levels of vitamin D are common

Very few children had severely low serum levels of vitamin D. However, 20% had a serum vitamin D level lower than 50 nmol/l, which is often considered as a sufficient level. Children whose blood samples were taken in the autumn had the highest serum vitamin D levels. This may be explained by the fact that in the summer, vitamin D is formed on the skin due to sunlight exposure. In northern latitudes, there is not enough sun exposure to maintain sufficient vitamin D levels in the winter season, and vitamin D supplementation is often required. A sufficiently high serum vitamin D level is associated with better bone health and there is some evidence that it may also be associated with a lower risk of many chronic diseases.
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Milk fortified with vitamin D is children's most important source of vitamin D

More than 80% of the children had a lower intake of vitamin D from food and vitamin supplements than recommended 10 μg per day in Finland. Furthermore, as many as 40% of the children did not use any vitamin D supplements at all. Milk was the most important source of vitamin D, amounting to nearly 50% of the children's intake. Approximately 30% of the vitamin D intake was from dietary fats and approximately 10% from fish.

The majority of milk products and spreads available in Finland are fortified with vitamin D. The level of fortification of milk has been increased from 0.5 g/100g to 1 g/100g since the collection of the study data and therefore we suppose milk is even more important source of vitamin D in Finland at the moment. Vitamin D fortification of milk products could be an effective way to improve vitamin D status also in other countries where milk consumption is high.

Adherence to nutrition recommendations can improve serum vitamin D levels

The Finnish nutrition recommendations published in 2014 recommend a vitamin D supplement of 7.5μg per day to all 2-18 year old children and adolescents all year round. In addition, 5-6 dl (2.5-3 glasses) of dairy products fortified with vitamin D per day and 2-3 servings of fish per week are recommended. The diet should also contain vegetable oil based spreads which are fortified with vitamin D. Moreover, sufficient exercise - and especially exercise taking place outdoors - should be encouraged among children.

Population-based study provides insight into health and well-being of children and adolescents

The Physical Activity and Nutrition in Children (PANIC) Study is an on-going lifestyle intervention study in the Institute of Biomedicine at the University of Eastern Finland. A total of 512 children aged 6 to 8 years participated in the baseline measurements in 2007-2009, constituting a representative sample of their age group. The PANIC Study produces scientifically valuable information on children's lifestyles, health and well-being. The next follow-up round will begin in early 2016.

Source: Eurekalert
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