Another epidemiological (population-based) study misinterpreted as
attributing causality (increased serum vitamin C levels reduce mortality
rates).  Epidemiological studies can only suggest cause and effect.

The possible problem is that the cohorts with the highest levels of serum
vitamin C may also be the same group with the best triglyceride/HDL ratio,
best intake of fruits and vegetables (phytonutrients protecting against
cancer), best exercise patterns, best intake of other supplements, highest
socioeconomic status, lowest stress index, lowest exposure to environmental
toxins, and on and on.  Who's to say which one, or all of these, are
responsible for lower rates of morbidity?

In order to improve cause and effect interpretation, some of these other
variables must be adjusted in terms of total mortality figures.  After you
take out reductions in mortality from some of the above factors
(phytonutrients, income, exercise...) you may find that vitamin C has little
to no effect.

Rob
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WESTPORT, CT (Reuters Health) Mar 01 - Results of a prospective population
study, published in the March 3rd issue of The Lancet, show that even a
small increase in vitamin C intake can significantly reduce all-cause
mortality.