There is no clinical information showing that eating bananas and hot water together will cause diarrhea.
Bananas have a laxative effect, for constipation can be appropriate to eat bananas with can assist in defecation. But there is no information showing that bananas and hot water with food will be diarrhea, nutritional dietary information also does not show that the two have a mutually exclusive role.
Diarrhea due to improper diet or unclean, acute gastroenteritis and other gastrointestinal diseases, and there is no relevant information that bananas and hot water with diarrhea causes.
As long as any food is consumed in moderation, it generally does not cause adverse reactions (except for those who are allergic or hypersensitive to certain foods). People with diarrhea should be careful not to consume spicy and stimulating foods that are too cold, and pay attention to reasonable diet and nutrition.