We’ve all heard the advice, “Eat more fiber.” But the reality behind that seemingly simple recommendation is much more complex when it comes to human health. As part of a $3.7 million National Institutes of Health-funded project, UC Davis scientists are building a library of biomarkers associated with specific fiber food sources as they pass through the gut. The goal is to build a comprehensive understanding of the structural diversity of fibers and how those structures influence digestive health.