Energy intake was significantly lower in the 30En % - protein condition ( 8.73 1.93 MJ/d ) than in the 5En % - protein ( 9.48 1.67 MJ/d ) and 15En % - protein ( 9.30 1.62 MJ/d ) conditions ( P = 0.001 ) , stemming largely from lower energy intake during meals ( P = 0.001 ) .