Fig. 2
The forest plot of whole grains intake and digestive tract cancers risk. As shown in Fig. 2, thirty-five studies were included in the analysis of whole grains intake and digestive tract cancer risk. The result showed that whole grains consumption can reduce the risk of digestive tract cancer by 22% (RR = 0.78, 95% CI: 0.73–0.84, P < 0.001), with a significant heterogeneity (I2 = 69.4%, P < 0.001)