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Abstract
The importance of maternal diet on fetal substrate provision has been reviewed. There
is significant variation in the energy requirements for pregnancy between populations
and individuals. This is particularly noticeable when contrasting and comparing studies
from the developed world with those from developing countries. The effects of energy
deficit have been illustrated with reference to famine. The somewhat paradoxical situation
relating to excess requirements has been demonstrated by reference to excess protein
intake and the consequential decrease in birthweight. Further evidence of adverse
effects of excess substrate provision is provided by studies of pregnancy complicated
by diabetes.
Qualitative as well as quantitative aspects of maternal diet have been discussed.
Current evidence suggests that altering the maternal nutrition influences the substrate
mix. In the second half of pregnancy insulin resistance occurs. Insulin's actions
on maternal metabolism affect the provision of the main fetal substrate, glucose,
but also influence the availability of other substrates. Dietary modifications can
result in a state of decreased insulin resistance and this could have important clinical
consequences in the obese gravida and in diabetic pregnancy. There have also been
suggestions that dietary manipulation may also influence the occurrence of certain
adult diseases if Barker's hypothesis is maintained.
Despite recent additions to the literature controversy still exists with regard to
most aspects of fetal substrate provision and further research is needed to address
some of these uncertainties.
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© 1999 Published by Elsevier Inc.