Findings from microbiologists at Stanford University revealed that low-fiber diet considerably reduces the diversity of the gut microbiome.
The researchers fed human fecal samples to germ-free mice to colonize their gastrointestinal tract with a human gut microbiome. Over a period of seven weeks, some of the mice received low-fiber diet and others received a diet rich in fiber. For mice that received a low-fiber diet, the researchers observed a dramatic decline in bacterial diversity. The abundance of about 60% of the bacterial species were considerably decreased. The bacterial diversity of the gut microbiome of mice that received high-fiber, however, was largely unaffected.
These findings underpin the close relationship between diet and the bacterial composition of the gut microbiome.