Why does the mother have to eat sensibly when during pregnancy?

Answer 1

Because you have to remember,that when you are pregnant, you have a rapidly, and I mean rapidly growing baby inside your uterus, and they need very good nutrition. Also, if a fetus does not have proper nutrition, nutrition will be taken from the mother to accomodate the fetus. Obviously, this is not good for the mother.

That is not to say a mother cannot have sweets during pregnancy, she just has to remember that healthy foods help make a healthy baby!