Soldiers’ moms will no doubt be horrified. But the Pentagon is looking into ways for GIs to fight for up to five days — without eating a single meal. During a mission, soldiers in the field typically don’t have the time, or the inclination, to chow down. That lack of food can affect their battlefield performance. So Darpa, the U.S. military’s far-out research arm, wants scientists to figure out if soldiers can operate at top levels — without lunch breaks. “The question is: ‘Are there temporary biochemical approaches we can use to squeeze the last ounce of performance out of soldiers when they’re already worked to exhaustion?'” said a Darpa life sciences consultant, who asked not to be named.