Nutrition a Major Factor In Rise In Twin Pregnancies
Twin Pregnancy and Nutrition
The commonly held view that IVF is the only culprit in the steady increase in the numbers of twins born over the past thirty years was challenged by a scientist speaking at the 22nd annual conference of the European Society of Human Reproduction and Embryology in Prague, Czech Republic, Wednesday 21 June 2006. Professor Robert Jansen, Medical Director of Sydney IVF, Sydney, Australia, said that his research had shown that improved nutrition, both maternal and in the lab in the case of IVF, had produced better and stronger embryos.
"Over the last 100 years, both in the UK and Australia, there has been an increase in identical twinning through the division of the embryo into two, even without IVF", he said, "and with the move to single embryo transfer with IVF this trend is obviously set to continue." Professor Jansen went on to say that the present rate of identical twinning with IVF is between one-in-a-hundred and one-in-fifty, a little over twice the rate involved when getting pregnant naturally.
Professor Jansen and his team reviewed Australian national birth statistics from 1920 to 2003 to determine the sex of babies at birth among multiple pregnancies. They found that the rate of dizygotic (DZ) twinning