TLDR
Some fermented foods may help with weight control, blood sugar, inflammation, and gut health. The benefits are promising but vary by food, person, and dose, while some products can contain harmful amounts of salt or other substances.
Summary
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1 Study Aim
The authors aim to review evidence on fermented foods and obesity. They examine possible effects on body weight, metabolism, inflammation, and the gut microbiome (the community of microorganisms living in the intestine). They also explain possible biological mechanisms, identify knowledge gaps, and discuss safety challenges. The review considers whether fermented foods could support long-term, personalized dietary treatment. The study asks how fermented foods might help manage weight and related health problems.
2 Study Design
The authors conducted a comprehensive review of recent clinical studies, animal experiments, and laboratory cell studies. They selected research examining fermented foods, body weight, body fat, food intake, metabolic pathways, immune responses, and gut microbiome changes. The review covered dairy products, grains, vegetables, fruits, beverages, and mixed foods. It compared evidence involving live probiotic microorganisms (beneficial living microbes), fermentation products, and altered food compounds. The authors also assessed differences in doses, study lengths, participants, animal models, and measured outcomes. They emphasized that the available studies were highly varied, with few long-term human trials. The researchers compared many kinds of studies to understand possible benefits, limits, and risks.
3 Findings
The authors report that fermented foods may reduce fat production, improve blood sugar handling, and lower inflammation. Short-chain fatty acids (SCFAs; small compounds made when gut microbes break down fiber) may influence appetite, gut conditions, and metabolism. Fermented foods may also increase helpful microbes and strengthen the intestinal barrier, although results are inconsistent. Human evidence remains limited, and appetite findings conflict across studies. Effects may depend on the food, dose, genetics, diet, and existing gut microbes. The authors recommend longer, better-designed human trials and personalized approaches using clinical and molecular data. They also warn that some products contain high salt, biogenic amines (substances that can cause harmful reactions), or potentially cancer-linked compounds. These foods may help some people, but stronger human evidence and safer product choices are needed.