We are all familiar with the phrase "you are what you eat". In fact, the food that you eat influences the population of microorganisms (bacteria and viruses) in your gut, collectively referred to as the gut microbiota. In humans, gut microbiota go through some characteristic changes as we move from birth into our first year of life. A recent study supported by the UC Davis Center for Equine Health, led by Dr. Michael Mienaltowski of the UC Davis Department of Animal Science, reported that this is true for horses as well. Since there are many risks to the well-being of a newborn foal’s gastrointestinal (GI) system, being able to track and assess gut health could help optimize foal care from birth through weaning.