December 21, 2013

Dietary and Metabolic changes during pregnancy

Total metabolism is increased due to the needs of growing uterus and fetus. There is increased food intake during pregnancy. Gastrointestinal changes lead to characteristic alteration in the metabolism of carbohydrate, protein and fat. These changes which are brought about by human placental lactogen ensure that glucose is readily available for body and brain growth in the developing fetus and protect against nutritional deficiency. A continuous supply of glucose must be available to transfer to the fetus.

As the nutritional demand of fetus increases in 2nd half of pregnancy, and insulin resistance increases metabolisation of fat stores laid down in 1st half of pregnancy which provide extra energy to mother, However because of increase concentration of fatty acid resulting from this process , the mother is more prone to ketosis. Even and overnight fast of 12 hr will result in hypoglycemia and increased production of keton bodies. Restriction of carbohydrate in any diet may be avoided and mother may be encouraged to take bed time snacks.

Iron is very important mineral in pregnancy. Iron is absorbed in ferrous form by duodenum and jejunum. Iron is transported actively across the placenta to fetus. Total iron requirement during pregnancy is estimated approximately 1000 mg. In second half, daily requirement actually becomes very much increased to the extend of about 6-7 mg


Que.-  Why the continuous supply of glucose is necessary in pregnancy ?
           Why should pregnant woman not be skip meals ?

Ans.-  Pregnant woman should not keep fast and skip meals meals for 
following reasons -
          1. Maternal blood glucose level is critically important for the fetal well being.
          2. Fasting in pregnancy produce more intense ketosis known as accelerated starvation,
              that may be dangerous to fetal health.



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