Intestinal calcium absorption decreases with aging, but it is unclear whether this is
attributable to an age-related intestinal resistance to 1, 25-dihydroxyvitamin D [1, 25 (OH) …

We studied the mechanism of impaired calcium absorption with aging in 51 healthy women
whose ages ranged from 26 to 88 years. Serum concentrations of 1, 25‐dihydroxyvitamin D …

We investigated the role of circulating 1, 25-dihydroxycholecalciferol (1, 25 (OH) 2D) and
intestinal resistance to 1, 25 (OH) 2D in the diminished intestinal calcium absorption …

The exact mechanism for the decrease in intestinal calcium absorption with age is not yet
understood. A decrease with age in serum 1, 25‐dihydroxyvitamin D (1, 25 (OH) 2D) or a …

Although aged rats reportedly have reduced intestinal vitamin D receptor (VDR)
concentrations, it is unclear whether an analogous age-related defect occurs in man. Thus …

Age-related decline in intestinal calcium (Ca) absorption often occur in postmenopausal
osteoporotic women. The impaired Ca absorption can be corrected by estrogen (E2) …

To examine putative sources of interindividual variation in calcium absorption efficiency, we
studied 41 healthy premenopausal women (mean age, 36.4 yr). About half were randomized …

Estrogen treatment improves calcium malabsorption induced by surgical or natural
menopause, but the mechanisms involved are still under debate, with both increased …

Background: Vitamin D sufficiency may be determined by the serum concentration of 25-
hydroxyvitamin D [25 (OH) D] that results in maximal intestinal calcium absorption efficiency …

Background: The relative importance of vitamin D metabolites in the regulation of gut
calcium absorption has not been well studied in elderly women living in an environment with …