[lvhongyu]

Factors mitigating against pre-pregnancy nutrition
It is known that good nutrition before pregnancy is important because of the amount of "resources" childbirth requires. The process of pre-pregnancy nutrition is a process of "building up" the immune system in preparation of pregnancy, and is known as being one of the major factors in determining the success rate of conceiving healthy children.

As with most situations, the most important factor in pre-pregnancy nutrition is ensuring that the mother is healthy and without any major factors which could worsen the chances of conceiving, factors such as anorexia or bulimia are thought to be direct links with infertility; the minimum body mass index for conceiving mothers being 20.8.

This is also seen to be true with obese women with a BMI above 30 which is a direct result of decrementing amounts of insulin activity and sex hormones may reduce the viability of the ovum.

The ideal range of weight for women wishing to conceive children is thought to be optimal at body mass indexes between 20 and 26. If this, again, is used in conjunction with good nutrition and diet before pregnancy in terms of a normal balanced diet, then reserves of micronutrients, providing materials for pregnancy, would also be maximised.

For more information on how BMI is calculated, please refer to the body mass index article.
Major benefactors in pre-pregnancy diets
As with most diets, there are chances of over-supplementing, however, as general advice, both state and medical recommendations are that mothers follow instructions listed on particular vitamin packaging as to the correct or recommended daily allowance (RDA).

Magnesium and zinc supplementation for the binding of hormones at their receptor sites.
Folic acid supplementation, or dietary requirement of foods containing it for the regular growth of the follicle.
Regular Vitamin D supplementation decreases the chances of deficiencies in adolescence. More importantly, it is known to reduce the likelihood of rickets with pelvic malformations which make normal delivery impossible.
Regular Vitamin B12 supplementation, again is known to reduce the chances of infertility and ill health.

[Husher]

I'm so glad you posted this because I've found in my reading as well that nutrition can be very important when it comes to TTC and having a healthy pregnancy. It's obviously not everything because lots of women don't eat very healthy and have health problems and are still able to deliver healthy babies but I think a lot of people don't even think about how their nutrition can affect their ability to get pregnant. Great information!