Ripe banana
Allowed — On the allowed list of the leaflet this book follows and of every hospital compared.
Stoma note: Tends to thicken stoma output.
Banana is one of the few fruits allowed outright by every source compared for this book. There is no skin to remove once it is peeled, no seed worth the name, and no core. It is also the fruit most likely to be in the house already and the one that needs no cooking, which counts for a great deal on a day when standing up is an effort.
Ripeness matters
A green-tinged banana is firmer and its starch has not yet turned to sugar, which makes it both harder work to digest and less pleasant to eat. What you want is properly ripe, soft, with plenty of brown freckling on the skin. If it is still firm, leave it in a paper bag on the windowsill for a day.
Overripe is not a problem here. A banana that has gone too far for eating out of hand is exactly right mashed into custard or blended into a shake.
For a stoma
Ripe banana is one of the named foods that thicken loose stoma output, alongside white rice, white bread and mashed potato, and it appears in the high-output guidance for that reason. It is a useful thing to reach for on a day when things have been loose. See thickening stoma output.
Where hospitals differ
They do not. Banana is allowed by the leaflet this book follows and by every other list compared for it.
Worth knowing
Dried banana chips are a different food and are out, along with all dried fruit.