Former NASA astronaut Chris Cassidy (IMAGE) NASA/Johnson Space Center Caption Former NASA astronaut Chris Cassidy processes biological samples in a glovebag aboard the International Space Station for the Food Physiology experiment to characterize the key effects of an enhanced spaceflight diet on immune function, the gut microbiome, and nutritional status indicators. Credit NASA 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.