An interesting article about how fiber affects the microbiome.
when Sonnenburg fed mice plenty of fiber, microbes that specialized in breaking it down bloomed, and the ecosystem became more diverse overall. When he fed mice a fiber-poor, sugary, Western-like diet, diversity plummeted. (Fiber-starved mice were also meaner and more difficult to handle.) But the losses weren’t permanent. Even after weeks on this junk food-like diet, an animal’s microbial diversity would mostly recover if it began consuming fiber again.