After studying the birthing records of 1,000 vegan women, Dr. Gary Steinman of the Long Island Jewish Medical Center observated that women who consume dairy are five times more likely to bear twins than their vegan counterparts. Dr. Steinman believes Insulin-like Growth Factor (IGF), an ovulation inducing compound produced by animals exposed to growth hormones, may be to blame. With increased use of growth hormones in cow husbandry, IGF levels in milk drinking women is on the rise. Non-vegan women have 13 percent more IGF in their blood than vegan women. Because of the risks associated with multiple gestations, Dr. Steinman suggests that women considering pregnancy switch over to a vegan diet.

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