caffeine in tea negatively affects bone mineral density?
not according to:

http://www.***.com/ :80/entrez/query.fcgi?cmd=Retrieve&db=PubMed&
list_uids=10731510&dopt=Abstract

full text available etc...

1: Am J Clin Nutr 2000 Apr;71(4):1003-7
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                       Tea drinking and bone mineral density in older
women.

                       Hegarty VM, May HM, Khaw KT

                       Clinical Gerontology Unit, University of
Cambridge School of Medicine,
                       Addenbrooke's Hospital, Cambridge, United
Kingdom.

                       BACKGROUND: High caffeine intake is reportedly a
risk factor for reduced
                       bone mineral density (BMD) in women. Most
studies, however, are from
                       populations in which coffee drinking predominates
and is the major caffeine
                       source. Tea contains caffeine but also has other
nutrients, such as flavonoids,
                       that may influence bone mass in different ways.
OBJECTIVE: We examined the
                       relation between tea drinking and BMD in older
women in Britain, where tea
                       drinking is common. METHODS: We measured BMD at
the lumbar spine,
                       fem{*filter*}neck, greater trochanter, and Ward's
triangle in 1256 free-living women
                       aged 65-76 y in Cambridge, United Kingdom. Tea
drinking was assessed by
                       self-completed questionnaire and women were
categorized as tea drinkers or
                       non-tea drinkers. RESULTS: There were 1134 tea
drinkers (90.3%) and 122
                       non-tea drinkers (9.7%). Compared with non-tea
drinkers, tea drinkers had
                       significantly greater ( approximately 5%) mean
BMD measurements, adjusted
                       for age and body mass index, at the lumbar spine
(0.033 g/cm(2); P = 0.03),
                       greater trochanter (0.028 g/cm(2); P = 0.004),
and Ward's triangle (0.025 g/cm(2);
                       P = 0.02). Differences at the fem{*filter*}neck (0.013
g/cm(2)) were not significant.
                       These findings were independent of smoking
status, use of hormone
                       replacement therapy, coffee drinking, and whether
milk was added to tea.
                       CONCLUSIONS: Older women who drank tea had higher
BMD measurements
                       than did those who did not drink tea. Nutrients
found in tea, such as
                       flavonoids, may influence BMD. Tea drinking may
protect against osteoporosis
                       in older women.

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