Fermentation boosts anti-inflammatory power in dairy alternatives

Fermentation may enhance the anti-inflammatory and cardiometabolic bioactivity of plant-based dairy alternatives, such as oat and soy beverages, according to a study published in the journal Nutrients.

Diet and inflammation

Dietary factors contribute to the chronic disease burden, including diabetes, cardiovascular disease, and cancer. These are associated with chronic low-grade systemic inflammation and oxidative stress.

Anti-inflammatory properties of plant-based diets

Plant-based diets are rich in bioactive compounds with antioxidant and anti-inflammatory activities, including phenolics, carotenoids, vitamins, and polar lipids. Many of these have been previously linked to cardioprotective and anti-clotting processes.

Effects of fermentation on oats and soy beverages

The fermentation of soy and oats by lactic acid bacteria including Lactobacillus spp. and Streptococcus thermophilus has been reported to improve the bioavailability of their bioactive molecules and may strengthen their biologic effects. However, the lipids and associated bioactive compounds in these dairy alternatives remain largely unexplored. This study explored the effects of fermentation on bioactivity in commercial soy and oat beverages and yogurt-type products.

Dominant amphiphilic layer

In unfermented oat and soy beverages, the overall total lipid content was comparable, with amphiphilic compounds predominating in both. These include phospholipids and glycolipids that have known antioxidant, anti-inflammatory, and anti-thrombotic activity.

Lipophilic layer concentrates phenolics

Carotenoids localized in amphiphilic layer

In addition to phenolics, soy and oat beverages contain carotenoids. These hydrophobic compounds are unstable and poorly soluble in nonpolar lipids. They were concentrated within the amphiphilic fraction across all beverages, likely due to stabilization by polar lipids. Fermentation increased carotenoid concentrations in both soy and oat products, particularly in yogurt-type samples.

In earlier studies, the lipophilic fraction contained high-molecular-weight carotenoids and phenolics, while the amphiphilic fraction contained phenolics and low-molecular-weight carotenoids. The authors hypothesize that these differences might reflect the food matrix, the relatively inefficient extraction process, or the presence of highly lipophilic esterified or lipid-associated phenolics.

Synergistic interactions promote cardiometabolic health

These compounds, polar lipids, carotenoids, and phenolics, may act, based on prior evidence, synergistically to enhance antioxidant efficiency and anti-inflammatory effects. For instance, phenolics scavenge free radicals and reduce oxidative stress while also activating the body’s antioxidant generative pathways.

Simultaneously, polar lipids and phenolics inhibit lipid peroxidation, thereby stabilizing biomembranes. Polar lipids form interfaces where lipophilic antioxidants and hydrophilic phenolics localize in close relation, acting together and possibly regenerating antioxidant capacity at the interface. These effects could inhibit LDL oxidation and other prothrombotic and pro-inflammatory pathways linked to atherosclerosis.

Unsaturated fatty acid ratios

In addition to bioactives, unfermented soy drinks have an anti-inflammatory unsaturated fatty acid ratio, whereas oat drinks have a more pro-inflammatory ratio. Fermentation was associated with a more favorable ratio in both, with anti-inflammatory, cardioprotective, and anti-thrombotic activity linked primarily to changes in the n-6/n-3 ratio rather than a shift in overall lipid class dominance.

Platelet activity

Structure-function relationships in phospholipids

Soy and oat beverages provide phospholipids that play important structural and metabolic roles in the human body. The authors identified the main bioactive phospholipids in these beverages.

They observed that fermentation-associated differences in activity are associated with structural changes across multiple molecules. For instance, fermentation is associated with changes in phosphatidylcholine structure, including shifts in fatty acid composition, particularly improved n-6/n-3 balance and increased presence of monounsaturated and omega-3 fatty acids in specific molecular positions, which may contribute to enhanced bioactivity.

Despite these promising findings, the authors emphasize the study's preliminary nature, based on in vitro and ex vivo assays of commercial products rather than controlled human or clinical studies. Future studies are required to confirm whether these fermentation-driven changes are associated with meaningful health benefits in humans, and to clarify the underlying mechanisms.

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Journal reference:

• Koutis, N., Liepouris, G., Moysidou, I., et al. (2026). Fermentation Enhances Antioxidant, Antiplatelet, and Anti-Inflammatory Properties of Oat- and Soy-Derived Dairy Alternatives. Nutrients. DOI: https://doi.org/10.3390/nu18081260. https://www.mdpi.com/2072-6643/18/8/1260