"When I was just starting out, a close family member chatted me up about the difficulties she was having getting pregnant.  After a few off-color jokes, we made some assessments.  I felt that one of her main challenges was that she was a devout tri-athlete with less than 8% percent body fat. Although primed for the race, I didn’t think she was primed for motherhood.
For health and longevity most doctors I have encountered recommend women be between 12 and 18 percent body fat, although your personal doctor will know best. The bottom line: her doctor agreed, she was too 'fit' to conceive.
Pregnancy Nutrition: The story of the Too-Fit Client.
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Helped by minor dietary changes and healthy weight gain, she was able to conceive less than six months later, is on her third child, at her own perfect weight and ever
a true athlete."