The relations between vitamin D2 and D3 in the diet and plasma 250HD2 and 25OHD3 in elderly women in Great Britain

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Abstract
Vitamin D2 and D3 intake and plasma 25OHD2 and 25OHD3 were measured in 70 elderly women; 13 living at home and 57 long-stay patients with no access to sunlight. Vitamin D2 intake and plasma 25OHD2 were correlated in the whole group (p < .005) and vitamin D3 intake and plasma 25OHD3 and total D intake and total 25OHD were significantly correlated (p < .005) in the patients. In the whole group the plasma 25OHD2 increased by 4.5 nmol/1 for every 1 µg increase in vitamin D2 intake. This was also the increase observed in a longitudinal study of vitamin D2 supplements in 11 patients. Vitamin D intake is a significant determinant of plasma 25OHD and the relation between them suggests that stores of vitamin D can be maintained at 20 nmol/1 in the elderly by a daily intake of 4 µg of vitamin D, even in the absence of sunlight.