Lead researcher Dr. Neal Barnard, president of the Physicians Committee for Responsible Medicine and adjunct professor at the George Washington University School of Medicine, said in a news release:“We do not fully understand yet why this combination works but it seems that these three elements are key— avoiding animal products, reducing fat, and adding a serving of soybeans. Our results mirror the diets of places in the world, like pre-Westernized Japan and modern-day Yucatán Peninsula, where a low fat, plant-based diet including soybeans is more prevalent and where postmenopausal women experience fewer symptoms.”

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Interesting. PCRM is a PETA-funded group. I wonder if avoiding animal products was really necessary, and it didn't have more to do with reduction of highly oxidizible vegetable oils.