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(Vitamin D occurs naturally in fatty fish such as salmon and tuna, beef liver, cheese, and egg yolks.It’s also found in fortified foods such as milk, orange juice, and cereal.) “You are at risk of D deficiency only if you have no sun exposure, live above 55 degrees latitude, and do not eat vitamin D-fortified paper.“There really is no health boost for vitamin D supplementation,” Clifford J.
“Maybe people will stop taking vitamin D supplements, but somehow I doubt it.
Vitamin D may also play a role in muscle function and the immune system.
But in most people with no symptoms of deficiency, the tablet shows such little utility that doctors are even questioning why we bother to measure vitamin D levels in those who aren’t at risk.
Most of us actually get enough vitamin D without even trying.
Professional medical groups can’t agree on a cutoff.
The Institute of Medicine recommended a diagnosis be made only for people who have less than 20 nanograms of the vitamin per milliliter of blood, but labs and other professional groups use higher thresholds.
In 2010, the Institute of Medicine (now known as the National Academy of Medicine) brought together an expert committee to review the evidence on the vitamin and figure out whether there was a widespread deficiency problem in North America.
According to the 14-member panel, 97.5 percent of the population got an adequate amount of vitamin D from diet and the sun.
Taking vitamin D every day has been shown to reduce the risk of falling in older individuals.
Other ways vitamin D is thought to help us, and how much we would need to take, is an area of active research (and controversy).