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Abstract
The effects of different levels of nitrogen, phosphorus, and caffeine intake on calcium
balance and on certain of its components were assessed in 170 studies in normal middle-aged,
but still premenopausal women. Statistically significant negative associations with
calcium balance were found for nitrogen and for caffeine, but no effect could be found
for phosphorus. Higher nitrogen intakes were associated with proportionately higher
levels of urinary calcium; higher phosphorus intake was associated with slightly lower
levels of urinary calcium but also with slightly more intestinal secretion of calcium.
Since these two effects were opposite in direction, there was no net association of
different phosphorus intakes with calcium balance. Caffeine intake was associated
with higher levels of both urinary calcium and intestinal calcium secretion. None
of the three intake variables was associated with differences in calcium absorption
efficiency. Both the nitrogen and the caffeine effects were proportional to intake.
The magnitude of the effects observed was such that a 50% increase in intake of nitrogen
above the group mean intake value would be predicted to result in calcium balance
shift of −0.032 gm/day. For caffeine, the corresponding calcium balance shift would
be predicted to be −0.006 gm/day.
Abbreviations:
total intestinal calcium secretion (TIC) ()To read this article in full you will need to make a payment
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Article info
Publication history
Accepted:
July 25,
1981
Received:
February 16,
1981
Footnotes
☆Supported by U.S.P.H.S. grant AM-07912.
Identification
Copyright
© 1982 Published by Elsevier Inc.
