Introduction: Fertility as a window to health.

Infertility has long-term effects beyond the inability to conceive. Infertility may be a harbinger of future disease and altered longevity. Understanding the mechanisms of how fertility is a window to health opens new avenues of important investigation addressing interdependent physiologic processes. Identification of healthy persons at risk for future cardiovascular disease, diabetes, or cancer could allow a change in reproductive medical care by altering long-term surveillance and reduction of risk.