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Your weight and your fertility

Your weight can affect your fertility: Princeton IVF blog
Being overweight can make it take longer to get pregnant in both men and women.

If either partner is overweight, it can harm your fertility

It has been know for for years that women who are overweight have a lower chance for success for IVF, and most fertility specialists encourage their patients who are overweight, to lose weight if possible, before treatment. So, the next logical questions is this: Does being overweight affect your chances of getting pregnant on your own even if you do not have infertility?

A study by National Institutes of Health (NIH) addressed that particular issue. The study was called the Longitudinal Investigation of Fertility and the Environment (LIFE) Study and they looked at couples who were both normal and with various degrees of being overweight to see how long it took them to conceive, commonly referred to as TTC. They looked about 500 couples from Texas and Michigan  and broke them down into 4 groups, normal weight (BMI 18-25), overweight (BMI 25-25), class I (BMI 30-34.9) and class II (BMI 35 and higher).  

The researchers found that in couples with class II obesity ( BMI > 35), it took 55% more time to conceive, than in normal weight couples.

It means that being significantly overweight not only affects your chances for pregnancy with fertility treatments such as IVF, it also makes it more difficult to conceive on your own.