Fat mouse (IMAGE) University of California - San Diego Caption In mouse models, researchers found that how much animals ate and when altered their gut microbiome, sometimes for the worse. Credit Public domain — original work of the Federal Government Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.