After six months , compared to the control group , the intervention group showed a significant improvement on fatigue ( = -3.76 , P < 0.001 ) , sleep quality ( = -0.59 , P = 0.007 ) , strenuous physical activity ( = 0.17 , P = 0.028 ) , and snacking behavior ( = -0.81 , P < 0.001 ) .