Banana Puree
Bananas contain fibre, which aids digestion and prevents constipation. Smooth bowels can be helped by drinking banana smoothies regularly. It also helps to stimulate the cells that line the stomach and help to eliminate bacteria that cause stomach ulcers.
While there's no blanket rule, sticking to one to two bananas per day shouldn't cause issues for most people. With that said, remember that they are relatively high in carbohydrates, so eating them along with protein or fat is also advisable to support stable energy levels.