Congenital malformations are worldwide occurrences striking in
every condition of society. These severe physical abnormalities
which are present at birth and affecting every part of the body
happen more often than usually realized, once in every 33 births.
The most common, after heart defects, are those of the neural tube
(the brain and spinal cord) which happen in as many as one in every
350 births. They have been noted as curiousities in man and beast
throughout recorded history and received great attention in our
time by various fields of study, for example, their faulty prenatal
development by embryologists, familial patterns by geneticists,
causation by environmentalists and variability by population
scientists.
Attention turned much in recent years to the relation of these
malformations to deficiency of a particular dietary ingredient,
folic acid, a subject this book analyzes in depth. The greatest
conundrum of all, which this latest matter like so much else hinges
on, is the amazing fact of the tremendous, almost universal
decrease in the frequency of these anomalies since early in the
20th century. The puzzle is 'What can this downward trend possibly
mean?' and at bottom 'Whether it is part of a long-term cyclical
pattern'. This fascinating biological phenomenon is explored in the
book together with various other topics.
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