Fermented foods like kombucha and sourdough bread are having a moment. They enjoy a constant presence in the news, among the budding health trends to watch in 2025. Even the United States Secretary of Health and Human Services, Robert F. Kennedy, Jr., has climbed onto the pro-fermentation bandwagon.

Kennedy has gone on record as saying he fills his plate with fermented dishes, as well as meats and meat byproducts. And it's hard to argue that — at least for him — his food choices have produced results. (Videos from 2024 show he has a surprisingly cut physique for a man in his 70s, which some attribute to a "dirty carnivore" style diet .)

But before you reach for another bowl of sauerkraut, you may want to hear about the hidden issues of eating fermented foods. Although it's generally a

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