Thus it is said that the craving is
the expression of a natural instinct, the system of the pregnant woman
really requiring the food she longs for. It is quite probable that this is
so in many cases, but it is obviously not so in the majority of cases,
even when we confine ourselves to the longings for fairly natural foods,
while we know so little of the special needs of the organism during
pregnancy that the theory in any case is insusceptible of clear
demonstration.
Allied to this theory is the explanation that the longings are for things
that counteract the tendency to nausea and sickness. Giles, however, in
his valuable statistical study of the longings of a series of 300 pregnant
women, has shown that the percentage of women with longings is exactly the
same (33 per cent.) among women who had suffered at some time during
pregnancy from sickness as among the women who had not so suffered.
Moreover, Giles found that the period of sickness frequently bore no
relation to the time when there were cravings, and the patient often had
cravings after the sickness had ceased.
According to another theory these longings are mainly a matter of
auto-suggestion. The pregnant woman has received the tradition of such
longings, persuades herself that she has such a longing, and then becomes
convinced that, according to a popular belief, it will be bad for the
child if the longing is not gratified.
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