Jul 23, 2018 · In review studies, researchers have linked vitamin D deficiency to depression, particularly in older adults (19, 20). In one analysis, 65% of the observational studies found Author: Franziska Spritzler, RD, CDE. Jul 16, 2009 · The pigment melanin reduces the skin's ability to make vitamin D in response to sunlight exposure. Some studies show that older adults with darker skin are at high risk of vitamin D deficiency.
May 28, 2014 · Vitamin D deficiency is prevalent in adults of all ages who always wear sun protection (which blocks vitamin D production) or limit their outdoor activities Researchers estimate that 50 percent of the general population is at risk of vitamin D deficiency and insufficiency, and this percentage rises in higher-risk populations such as the elderly and those with darker skin. The amount of vitamin D you need each day depends on your age. The recommended amounts, in international units (IU), are. Birth to 12 months: 400 IU. Children 1-13 years: 600 IU. Teens 14-18 years: 600 IU. Adults 19-70 years: 600 IU. Adults 71 years and older: 800 IU. .
Mar 26, 2018 · A study including over 500 adults found that vitamin D deficiency was linked to greater fat mass, but only in those with elevated parathyroid hormone (PTH), suggesting the cause may lie in controlling that level. Skeletal disease. Vitamin D enhances the absorption of dietary calcium by 30%-40% and phosphorus by 80%. Thus, vitamin D deficiency is usually accompanied by normal blood levels for calcium and phosphorus, high-normal or elevated levels of PTH, normal to elevated levels of total alkaline phosphatase, a low 24-hour urine calcium excretion rate, and low levels of total 25 (OH)D.Cited by: 312.