Boys or Girls by the Flick of the Fork???: The Questionable Basis of the Preconception Gender Diet.PALMER, CAROLE A. Ed.D., R.D.; DWYER, JOHANNA T. D.Sc., R.D.Nutrition Today: May/June 1992 Article: PDF Only Abstract An examination of the claim that manipulation of the maternal diet prior to conception influences sex selection suggests that this claim is psuedoscientific. (C) Williams & Wilkins 1992. All Rights Reserved.