A.V. Galchenko
Federal Research Centre of Nutrition,
Biotechnology and Food Safety,
Ustinsky proezd, 2/14, Moscow, 109204,
Russian Federation
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ABSTRACT. This manuscript contains no answers to any of the
questions posed in the title. Instead, the reader is invited to a discussion
about what is a physiological need and an adequate intake level of a nutrient,
and how to determine them; why an understanding of the signs of clinical
deficiency is necessary to recommend a nutrient consumption rate; how to draw
the boundary of the metabolic influence of a chemical element; and why, with
regard to sulphur, reasoning of all these things inevitably leads to a dead
end.
KEYWORDS:
thiol, mercaptan, thioether, methionine, cysteine, thiamine, biotin, thioctic
(lipoic) acid, recommended dietary intake, adequate intake level.