sentences:  This alteration in sex steroid levels due to obesogens can vary enormously according to both the sex of the exposed individual as well as the timing of the exposure.If the chemicals are introduced at critical windows of development, the vulnerability of an individual to their effects is much higher than if exposure occurs later in adulthood.It has been shown that obesogenic effects are apparent in female mice exposed to both phytoestrogens and DES during their neonatal periods of development, as they, though born with a lower birth weight, almost always developed obesity, high leptin levels, and altered glucose response pathways.