Fiber Affects Gut and Metabolic Health

Of the many environmental variables that affect the phenotype of an animal, diet is one that can be easily controlled. Laboratory rodent diets are classified into 2 main types: grain-based diets (GBDs) or purified diets (PDs). GBDs (or cereal-based diets or natural ingredient diets) are typically closed formulas and made with grain-based ingredients and animal byproducts.