Health and Fitness Balance Tips Toward Environment as Heritability Ebbs in Autism by Gary Kopycinski on July 5, 2011 Gary Kopycinski Author More in Health and Fitness: On Hantavirus, Park Forest Officials Urge Caution May 18, 2026 Rep. Kelly Condemns FDA Approval of Flavored E-Cigarettes May 6, 2026 Park Forest Aligns With Illinois Guidance on Childhood Vaccines Amid Federal Changes January 11, 2026 Bethesda, Maryland–(ENEWSPF)–July 5, 2011. The largest and most rigorous twin study of its kind to date has found that shared environment influences susceptibility to autism more than previously thought.