Extracts of broccoli and banana could help fight stomach problems. Studies show that fibers from the foods may boost your natural defenses against stomach infections.
Scientists looked at how roughage influenced the passage of harmful bacteria through gut cells. They found that certain fibers were particularly beneficial.
On the other hand, according to BBC News:
“... [A] common stabilizer added to processed foods during the manufacturing process had the opposite effect ... This research shows that different dietary components can have powerful effects on the movement of bacteria through the bowel.”