Switching from a low-fat, plant-based diet to one high in fat and sugar alters the collection of microbes living in the gut in less than a day, with obesity-linked microbes suddenly thriving, according to new School of Medicine research.
The study was based on transplants of human intestinal microbes into germ-free mice.
Over time, mice that received the transplants, or humanized mice, on the junk-food diet became obese. Their weight gain was in lock step with dramatic shifts in the types of intestinal bacteria present compared to mice on a low-fat diet.
Using the latest DNA sequencing technology, the researchers found that mice on the high-fat, high-sugar diet had more microbes and microbial genes devoted to extracting calories from their "western" diet. These microbial genes were turned on when the mice were switched to the diet high in fat and sugar.
The study, published in Science Translational Medicine, documents the intimate relationship between diet and the dynamic variations in the community of intestinal microbes that can influence metabolism and weight.
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