An evaluation of surgically obtained skin (age range, 8-92 yr) revealed that there is an age-dependent decrease in the epidermal concentrations of provitamin D3 (7-dehydrocholesterol). To ascertain that aging indeed decreased the capacity of human skin to produce vitamin D3, some of the skin samples were exposed to ultraviolet radiation and the content of previtamin D3 was determined in the epidermis and dermis. The epidermis in the young and older subjects was the major site for the formation of previtamin D3, accounting for greater than 80% of the total previtamin D3 that was produced in the skin. A comparison of the amount of previtamin D3 produced in the skin from the 8- and 18-yr-old subjects with the amount produced in the skin from the 77- and 82-yr-old subjects revealed that aging can decrease by greater than twofold the capacity of the skin to produce previtamin D3. Recognition of this difference may be extremely important for the elderly, who infrequently expose a small area of skin to sunlight and who depend on this exposure for their vitamin D nutritional needs.
J MacLaughlin, M F Holick
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Title and authors | Publication | Year |
---|---|---|
Nutrition and Disease Prevention
K Imaizumi |
Soy in Health and Disease Prevention | 2005 |
Nutrition in Exercise & Sport
J Cooper, P Deuster |
Sports Nutrition | 2005 |
Effects of long-term treatment with loop diuretics on bone mineral density, calcitropic hormones and bone turnover
L Rejnmark, P Vestergaard, L Heickendorff, F Andreasen, L Mosekilde |
Journal of Internal Medicine | 2005 |
Season of diagnosis is a prognostic factor in Hodgkin's lymphoma: a possible role of sun-induced vitamin D
AC Porojnicu, TE Robsahm, AH Ree, J Moan |
British Journal of Cancer | 2005 |
Calcium metabolism in the frail elderly
J Zochling, JS Chen, M Seibel, J Schwarz, ID Cameron, RG Cumming, L March, PN Sambrook |
Clinical Rheumatology | 2005 |
Endocrine regulation of bone turnover in men
C Meier, PY Liu, DJ Handelsman, MJ Seibel |
Clinical Endocrinology | 2005 |
VITAMIN D IN HEALTH AND DISEASE: Vitamin D and the Epidemiology of Prostate Cancer
GG Schwartz |
Seminars in Dialysis | 2005 |
Effect of vitamin D and calcium supplementation on bone turnover in institutionalized adults with Down's Syndrome
P Zubillaga, A Garrido, I Mugica, J Ansa, R Zabalza, JI Emparanza |
European Journal of Clinical Nutrition | 2005 |
Living in Low-Latitude Regions in the United States Does Not Prevent Poor Vitamin D Status
S Park, MA Johnson |
Nutrition Reviews | 2005 |
Prevalence of vitamin D inadequacy in Scottish adults with non-vertebral fragility fractures
SJ Gallacher, C McQuillian, M Harkness, F Finlay, AP Gallagher, T Dixon |
Current Medical Research and Opinion | 2005 |
The high prevalence of inadequate serum vitamin D levels and implications for bone health
JY Reginster |
Current Medical Research and Opinion | 2005 |
Amelioration of Osteoporosis and Hypovitaminosis D by Sunlight Exposure in Hospitalized, Elderly Women With Alzheimer's Disease: A Randomized Controlled Trial
Y Sato, J Iwamoto, T Kanoko, K Satoh |
Journal of Bone and Mineral Research | 2005 |
Vitamin D Deficiency in Community Older Adults with Falls of Gait Imbalance : An Under-Recognized Problem in the Inner City
TS Dharmarajan, M Akula, S Kuppachi, EP Norkus |
Journal of Nutrition For the Elderly | 2005 |
Handbook of the Biology of Aging
PM Wise |
Handbook of the Biology of Aging | 2005 |
Skin Barrier: Basis for Functional Abnormalities
C Barland, R Ghadially |
Skin Barrier | 2005 |
Osteoporosis and Periodontal Disease:
EA Krall |
Topics in clinical nutrition | 2005 |
Déficit de vitamina D en el adulto: clínica, diagnóstico y tratamiento
M Marazuela |
Endocrinología y Nutrición | 2005 |
The Vitamin D requirement in health and disease
RP Heaney |
The Journal of Steroid Biochemistry and Molecular Biology | 2005 |
The Vitamin D Epidemic and its Health Consequences
MF Holick |
The Journal of nutrition | 2005 |
Circulating 25-Hydroxyvitamin D Levels Indicative of Vitamin D Sufficiency: Implications for Establishing a New Effective Dietary Intake Recommendation for Vitamin D
BW Hollis |
The Journal of nutrition | 2005 |
Vitamin D Intakes by Children and Adults in the United States Differ among Ethnic Groups
CE Moore, MM Murphy, MF Holick |
The Journal of nutrition | 2005 |
Dermatologie und Venerologie
O Braun-Falco, G Plewig, HH Wolff, WH Burgdorf, M Landthaler |
2005 | |
Prevalence of Vitamin D Inadequacy among Postmenopausal North American Women Receiving Osteoporosis Therapy
MF Holick, ES Siris, N Binkley, MK Beard, A Khan, JT Katzer, RA Petruschke, E Chen, AE de Papp |
The Journal of clinical endocrinology and metabolism | 2005 |
Body Fat and Vitamin D Status in Black Versus White Women
AC Looker |
The Journal of clinical endocrinology and metabolism | 2005 |
25-Hydroxyvitamin D in Peritoneal Dialysis Patients: A Substrate for Investigation
AR Morton |
Peritoneal dialysis international : journal of the International Society for Peritoneal Dialysis | 2005 |