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 |
---|---|---|
Hypovitaminosis D in acutely injured pediatric burn patients
MM Gottschlich, T Mayes, J Khoury, GD Warden |
Journal of the American Dietetic Association | 2004 |
Vitamin D status of middle-aged women at 65–71°N in relation to dietary intake and exposure to ultraviolet radiation
M Brustad, E Alsaker, O Engelsen, L Aksnes, E Lund |
Public Health Nutrition | 2004 |
Effect of clothing varieties on solar photosynthesis of previtamin D3: an in vitro study
FM Salih |
Photodermatology, Photoimmunology and Photomedicine | 2004 |
Vitamin D Insufficiency and Deficiency in Chronic Kidney Disease
EA González, A Sachdeva, DA Oliver, KJ Martin |
American Journal of Nephrology | 2004 |
Synthesis of vitamin D in skin after burns
GL Klein, TC Chen, MF Holick, CB Langman, H Price, MM Celis, DN Herndon |
The Lancet | 2004 |
Functional foods, ageing and degenerative disease
L Ovesen |
Functional foods, ageing and degenerative disease | 2004 |
Nutritional Aspects of Osteoporosis
R Rizzoli, P Ammann, T Chevalley, JP Bonjour |
Nutritional Aspects of Osteoporosis | 2004 |
Nutritional considerations for the older athlete
WW Campbell, RA Geik |
Nutrition | 2004 |
Does Routine Blood Bone Biochemistry Predict Vitamin D Insufficiency in Elderly Patients with Low-Velocity Fractures?
SK Singh, S Manjure, P Stott, A Shetty, SA Iversen, CR Williams |
Journal of Orthopaedic Surgery | 2004 |
Sunlight and vitamin D for bone health and prevention of autoimmune diseases, cancers, and cardiovascular disease
MF Holick |
The American journal of clinical nutrition | 2004 |
Vitamin D: importance in the prevention of cancers, type 1 diabetes, heart disease, and osteoporosis
MF Holick |
The American journal of clinical nutrition | 2004 |
Functional indices of vitamin D status and ramifications of vitamin D deficiency
RP Heaney |
The American journal of clinical nutrition | 2004 |
Molekularmedizinische Grundlagen von altersspezifischen Erkrankungen
D Ganten, K Ruckpaul, A Ruiz-Torres |
2004 | |
Nutrition and Bone Health
MF Holick, B Dawson-Hughes |
2004 |