A woman (C) walks through Sydney's Circular Quay precinct, in September 2006. Australian researchers have found a fatty diet damages eggs in the ovaries and prevents them from becoming healthy embryos, a finding they say may explain why obese women are often infertile.(AFP/File/Greg Wood)AFP - Australian researchers have found a fatty diet damages eggs in the ovaries and prevents them from becoming healthy embryos, a finding they say may explain why obese women are often infertile.