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SentryS 13 points ago +14 / -1

"The bacterial enzyme that binds the nitrogen is damaged by the presence of oxygen so the bacterium makes the leghemoglobin to bind oxygen to keep it out of the way. To make enough leghemoglobin to add to the impossible whopper, scientists spliced the gene for leghemoglobin into yeast. They can grow the yeast easily and separate the leghemoglobin and add it to the impossible whopper. So the impossible whopper is technically a genetically modified organism (GMO).

He went on to compare the level of estrogen in the Impossible Burger to soy milk, writing that eating four of the vegetable burgers daily would result in a human male growing breasts:

Just six glasses of soy milk per day has enough estrogen to grow boobs on a male. That’s the equivalent of eating four impossible whoppers per day. You would have to eat 880 pounds of beef from an implanted steer to equal the amount of estrogen in one birth control pill."