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Tweelingen? Twins? Hoe vergroot ik de kans?

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Reported May 22, 2006
Want Twins? Don't Go Vegan!

(Ivanhoe Newswire) -- Women who consume animal products -- specifically dairy -- are five-times more likely to have twins than vegan woman, according to study findings of Gary Steinman, M.D., Ph.D., of Long Island Jewish Medical Center in New Hyde Park, New York.

The reason for this may be the role of insulin-like growth factor (IGF), a protein that is released from the liver of animals and leads to increased ovulation.

The rate of twin births has increased significantly in the last 30 years, attributed to assisted reproductive technologies and more older women having babies, as they are more likely to have twins. However, Dr. Steinman says the reason for this may also be "a consequence of the introduction of growth-hormone treatment of cows to enhance their milk and beef production."

In this new study, Dr. Steinman compared the twinning rates of women who ate a regular diet, a vegetarian diet with dairy and a vegan diet.

He concludes, "This study shows for the first time that the chance of having twins is affected by both heredity and environment or, in other words, by both nature and nurture." Dr. Steinman adds his findings are similar to those observed in cows by other researchers, in that a woman's chance of having twins correlates with her level of IGF.

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SOURCE: The Journal of Reproductive Medicine, 2006;51:405-410