Latest Medical Research:
Male Testosterone Levels
Dropping Sharply
A recent study published
in the Journal
of Clinical
Endocrinology and
Metabolism reported
that testosterone levels
among American males has
fallen sharply the past
two decades. Lead study
author Dr. Thomas G.
Travison, of the New
England Research
Institutes, stated that
average total
testosterone levels in
men aged 65 to 69 fell
16% from 503 nanograms/decileter
(ng/dL) in 1988 to 423
ng/dL in 2003.
"In 1988, men who were
50 years and older had
higher serum
testosterone
concentrations than did
comparable 50-year-old
men in 1996.”
Testosterone is the
primary male sex hormone
and plays an important
role in maintaining bone
and muscle mass. Low
testosterone levels have
been linked to health
problems, including
lowered libido and
diabetes.
It's normal for men's
testosterone levels to
peak in their late 20s
and then start to
gradually decline,
experts say. But the New
England Research
Institutes study found
that overall
testosterone levels are
lower than they were 20
years ago. The reasons
for this trend are
unclear. They noted that
neither aging nor
certain other health
factors, such as smoking
or obesity, can fully
explain the decline.
One theory is that
phytoestrogens and other
common chemicals in the
environment may be a
factor in explaining
declining testosterone
levels among American
males. A common source
of these phytoesterogens
and harmful chemicals
comes from the dry
cleaning process and
also from the plastic
bags used by cleaners.
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