Interest in gut health is increasing, leading many to include fermented foods in their diets amid rising concerns over colorectal cancer among young adults and the emergence of personalized gut microbiome treatments. The latest dietary guidelines from the federal government encourage Americans to consume more fermented foods, which have gained traction following promotion by Health Secretary Robert F. Kennedy Jr.'s Make America Healthy Again movement.
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Fermented foods, which have been part of human diets for thousands of years, include traditional items like yogurt, kimchi, sauerkraut, and South Indian idli and dosa. While health experts have scrutinized other diet trends associated with MAHA, there is scientific support for the health benefits of fermented foods.
Fermentation is the process in which naturally occurring microbes, including bacteria and yeast, break down and preserve food. Although research on their health benefits is ongoing, doctors like Dr. Lisa Ganjhu from New York University Langone Health highlight that the consumption of these foods supports gut health. However, not all fermented products are created equal; for instance, while beer and wine are fermented, they might not provide probiotics.
Experts such as Barbara Olendzki from the University of Massachusetts Chan Medical School stress the importance of choosing “whole fermented foods” like fermented vegetables alongside staples like yogurt and kefer. The microbes in these foods can help pre-digest substances, breaking them down and fostering a balanced gut ecosystem by competing with less beneficial bacteria.
Despite the clear benefits of some fermented foods, health professionals warn consumers against processed items that claim to be probiotic, as well as sugary alternatives that can exacerbate gut issues. They recommend looking for products labeled with “live cultures.”
While generally safe for most individuals, experts advise those with weakened immune systems or gastrointestinal conditions to consult healthcare providers before integrating fermented foods into their diets. Introducing these foods may lead to bloating or gas as the gut adjusts, prompting recommendations to slow down or stop consumption if discomfort arises.
Health experts suggest consuming a variety of fermented foods regularly, rather than favoring one over another. They propose including different types, such as milk-based and fiber-based options, in daily diets to improve gut health. Researchers continue to investigate the amount of fermented foods that should ideally be consumed, emphasizing the importance of a balanced diet that supports beneficial bacteria with fibrous prebiotics.