This study investigated anthropometric, psychomotor, and hemodynamic changes in young adult men during 21 continuous days of eating only meals, ready-to-eat (MREs). The MRE diet group lost more weight and bodyfat (significant at abdominal site, total skinfolds, and total bodyfat percent), and had significantly greater gains in hand grip strength than did controls. Results support the contention that, when eaten as designed, MREs are nutritionally adequate for maintaining body weight and muscle strength without adverse effects.