From Kit Up:

The Army is recruiting volunteers for a stomach-churning challenge: Eat nothing but meals-ready-to-eat for 21 straight days. For those brave enough to volunteer, military fitness expert Stew Smith has two tips: Stay active and stay hydrated.

The service announced its experiment in a Dec. 11 release. To study gut health and how bacteria in the stomach are affected by the military meals, the U.S. Army Research Institute of Environmental Medicine’s military nutrition division is recruiting volunteers to go on the all-MRE diet for three consecutive weeks.