evidence: Fears about soy products feminizing men have existed for quite a while. The Impossible Burger fear mongering, however, is a bit more recent. It stems from a 2019 story published by Tri-State Livestock News, a trade publication covering livestock agriculture. Written by James Stangle, who specializes in veterinary medicine, the story claims that four Impossible Whoppers a day contain "enough estrogen to grow boobs on a male." That story was then picked up by conversative pundits such as Michael Savage, according to The Washington Post. It seems silly to point out that few people, if any, are buying and consuming four Impossible Whoppers daily. But even if a man did decide to eat Impossible Whoppers for breakfast, lunch, dinner, and a snack between, he needn’t worry about developing feminine secondary sex characteristics. For starters, the compound contained in Impossible Burgers isn’t human estrogen at all—it’s phytoestrogen, a plant isoflavone that acts similarly to human estrogen, but doesn’t have nearly the same strength, according to Insider. Phytoestrogen, which is often found in soy, can promote the effects of naturally occurring estrogen, which exists in all humans. But it can also suppress it, since it has both estrogenic and anti-estrogenic effects. How phytoestrogen affects you depends on what your existing estrogen levels are as well as other individual biological factors. Regardless of whether it promotes or decreases the effects of naturally occurring estrogen, however, it still doesn’t have the strength to grow breasts in men.