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Intestinal microbiota may contribute to the development of inflammation and insulin resistance by two main mechanisms. First, gut microbiota might facilitate energy harvest from the gut leading via perturbation in energy homeostasis to fat deposition and increased adipokine production and plasma free fatty acid levels both contributing to insulin resistance and inflammation. Alternatively, it can initiate an inflammatory process either originating from the intestine or generated at the peripheral level via endotoxin leakage into the blood from the intestine, both leading secondarily to insulin resistance.
Bandt et al. (Tue,) studied this question.