Many American children are lacking in sufficient levels of one vitamin in particular: vitamin D. The main source of that vitamin comes not from ingestion, but from exposure to sunlight, which plays a key step in vitamin D synthesis in cells. Guidelines recommend that children have levels of vitamin D of at least 50 nmol/L. But a study found that about 1 in 5 kids — 6 million total — had levels below that mark. More than two-thirds of children have levels below 75 nmol/L, which is the level recommended for adults.
Since darker skin pigmentation makes absorption of sunlight more difficult, and thus synthesis of vitamin D less efficient, it’s not surprising that African-American children are much more likely to be deficient in vitamin D than white children. Children in the study who took multivitamins had higher levels of vitamin D, but less than half of kids actually take multivitamins. In many parts of the country, sunlight during the winter months is inadequate to produce vitamin D at sufficient levels. Plus, that particular vitamin does not occur naturally in a lot of common foods, so it’s hard to get it from other sources.
How can children get their needed vitamin D then? Some suggest that foods should be fortified with the vitamin to make it available to the entire public. The problem with that is, with some people already getting sufficient levels of the vitamin, adding into the food supply might be overkill. The best approach is probably encouraging the use of supplements. That way, kids don’t have to worry about too much sun exposure either, which can of course lead to skin cancer. But if we do nothing about this problem, we might see an increase in the health effects associated with not enough vitamin D intake.
Read more about this study in the Atlanta Journal Constitution.