aids the development of the foetal nervous system. studies with mice have found that food deprivation of the male mouse prior to conception leads to the offspring displaying significantly lower blood glucose levels. physical restraint external physical shocks or constraints due to growth in a restricted space may result in unintended deformation or separation of cellular structures resulting in an abnormal final shape or damaged structures unable to function as expected. an example is potter syndrome due to oligohydramnios. this finding is important for future understanding of how genetics may predispose individuals for diseases such as obesity, diabetes, and cancer. for multicellular organisms that develop in a womb, the physical interference or presence of other similarly developing organisms such as twins can result in the two cellular masses being integrated into a larger whole, with the combined cells attempting to continue to develop in a manner that satisfies the intended growth patterns of both cell masses. the two cellular masses can compete with each other, and may either duplicate or merge various structures. this results in conditions such as conjoined twins, and the resulting merged organism may die at birth when it must leave the life-sustaining environment of the womb and must attempt to sustain its biological processes independently. genetics main article: genetic disorder