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A recent epidemiological study showed that eating ‘fast food’ items such as potato chips increased likelihood of obesity, whereas eating yogurt prevented age-associated weight gain in humans. It was demonstrated previously in animal models of obesity that the immune system plays a critical role in this process. Here we examined human subjects and mouse models consuming Westernized ‘fast food’ diet, and found CD4 +  T helper (Th)17-biased immunity and changes in microbial communities and abdominal fat with obesity after eating the Western chow. In striking contrast, eating probiotic yogurt together with Western chow inhibited age-associated weight gain. We went on to test whether a bacteria found in yogurt may serve to lessen fat pathology by using purified  Lactobacillus reuteri  ATCC 6475 in drinking water. Surprisingly, we discovered that oral  L. reuteri  therapy alone was sufficient to change the pro-inflammatory immune cell profile and prevent abdominal fat pathology and age-associated weight gain in mice regardless of their baseline diet. These beneficial microbe effects were transferable into naïve recipient animals by purified CD4 +  T cells alone. Specifically, bacterial effects depended upon active immune tolerance by induction of Foxp3 +  regulatory T cells (Treg) and interleukin (Il)-10, without significantly changing the gut microbial ecology or reducing  ad libitum  caloric intake. Our finding that microbial targeting restored CD4 +  T cell balance and yielded significantly leaner animals regardless of their dietary ‘fast food’ indiscretions suggests population-based approaches for weight management and enhancing public health in industrialized societies.

Microbial Reprogramming Inhibits Western Diet-Associated Obesity