title: The impact of lifestyle factors on serum 25-hydroxy vitamin D levels in older adults: a preliminary study.
abstract: We studied 49 adults between the ages of 60 and 91 to determine the impact of lifestyle factors on serum 25-hydroxy vitamin D levels. The subjects were interviewed to determine their sunscreen use, sun exposure, dietary and supplemental vitamin D intake, current medical problems, and medications used. Serum levels of 25-hydroxy vitamin D (D2 and D3) were measured. Forty-six percent of our subjects had a total vitamin D intake less than 400 IU/day and 49% never used sunscreen. Sunscreen use was positively correlated with 25-hydroxy vitamin D serum levels. Total vitamin D intake was more significant than sun exposure in determining 25-hydroxy vitamin D levels.
authors.affiliation: University of Arizona College of Medicine, Department of Family and Community Medicine, Tucson.
authors.forename: E W
authors.initials: EW
authors.lastname: Kligman
authors.forename: A
authors.initials: A
authors.lastname: Watkins
authors.forename: K
authors.initials: K
authors.lastname: Johnson
authors.forename: R
authors.initials: R
authors.lastname: Kronland
mesh_terms: D015652:25-Hydroxyvitamin D 2 / Q000097:blood*; D000368:Aged; D001130:Arizona; D002112:Calcifediol / Q000097:blood*; D004032:Diet; D015438:Health Behavior; D006801:Humans; D008019:Life Style; D011481:Protective Clothing; D013472:Sunlight; D013473:Sunscreening Agents; D014807:Vitamin D
chemical_list: D013473:Sunscreening Agents; D014807:Vitamin D; D015652:25-Hydroxyvitamin D 2; D002112:Calcifediol