Key result
Oat-based diet lowers LDL cholesterol by ~16 mg/dL in metabolic syndrome.
RCT (n=68)
Parallel-design
Randomized controlled trial demonstrates cholesterol-lowering effects of oats in metabolic syndrome, suggesting beneficial interactions.
Oats have various positive effects on human health, but the underlying mechanisms are not fully understood. To identify oat-microbiome-host interactions contributing to metabolic improvements, we conducted two randomized controlled dietary interventions in parallel-design in individuals with metabolic syndrome, comparing a short-term, high-dose and a six-week, moderate oat intake with respective controls (DRKS00022169). Both oat diets lead to an increase in plasma ferulic acid (0.64 [0.26, 1.02], P = 0.002; 0.55 [0.21, 0.89], P = 0.003), while the high-dose oat-diet also increased dihydroferulic acid (1.23 [0.44, 2.01], P = 0.003). Here we show that microbial phenolic metabolites are driving factors for the cholesterol-lowering effect of oats, which might be of relevance since short-term, high-dose oat-diet is a suitable approach to alleviate obesity-related lipid disorders.
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Klümpen et al. (2026) conducted an RCT in Metabolic syndrome (n=68). Oat diet vs. Macronutrient-adapted control diet or habitual Western diet was evaluated on Plasma ferulic acid levels (β estimate 0.64, 95% CI 0.26, 1.02, p=0.002). Dietary intervention with oats significantly increased plasma ferulic acid levels (MD 0.64) and the short-term high-dose diet reduced LDL cholesterol by 16.26 mg/dL compared to control diets in patients with metabolic syndrome.
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