The scientists noted that even after the decline in number of transfer of embryos by in vitro fertilization during mid-90s, the proportion of twin births rose.
In new research, physician Gary Steinman and his colleagues used data obtained from mothers by way of questionnaire and compared that the number of twin births from moms who consumed meat and/or milk were five times more than those who consumed no animal products at all.
Studies show that the protein increases ovulation which persists in the body after entering via digested food, particularly milk.
Drinking a glass of milk a day over a 12-week period raised levels of the protein in the body by 10 percent. Vegan women, it turns out, have 13 percent lower concentrations of protein in their blood than omnivores.
According to Scientific American report, in the study published in the current issue of the Journal of Reproductive Medicine, Steinman holds bovine growth hormone, a protein released by the liver as the probable reason.
