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).