Putting lemon juice on bananas does change the taste of the bananas.
When you put lemon juice on bananas the lemon juice adds a subtle, bright tang or zesty and acidic counterpoint enhances the banana flavor.
The lemon juice on the bananas also prevents the bananas from turning brown by slowing down oxidation.
Although the lemon juice on the bananas should be used sparingly for a light touch or more generously for a distinct citrusy flavor, especially in fruit salads or even baked goods.
The citric acid from the lemon juice on the bananas provides the bananas with a bit of sourness that cuts through the sweetness of the bananas, which makes the flavor of the bananas more vibrant and less one dimensional.
The acidity of the lemon juice also makes the bananas taste fresher and more pronounced.
Adding a light spritz of lemon juice to the bananas adds a hint of different flavor and soaking the bananas in lemon juice can create a noticeably different flavor profile, which is similar to other citrus juices.