If you put a banana in the fridge and then take it out, a few things may occur depending on the banana's ripeness and the duration it spent in the fridge:
Temperature shock: Bananas are tropical fruits, and they are sensitive to temperature changes. Taking a cold banana out of the fridge and exposing it to room temperature might cause some condensation to form on the skin due to the temperature difference. This can make the banana feel wet on the outside.
Texture changes: The cold temperature in the fridge can cause the banana peel to darken or turn brown. Additionally, the chilling might affect the texture of the banana's flesh, making it softer or mushier than a fresh one kept at room temperature.
Slower ripening: If the banana was still green when placed in the fridge, it likely slowed down its ripening process. When you take it out, it may take some time for the banana to resume ripening and turn yellow. It's also possible that the ripening process won't continue evenly, leading to uneven ripening or browning of certain parts.
Taste: While the cold temperature doesn't significantly alter the taste of the banana, the texture change due to chilling might affect the overall eating experience.
It's worth noting that if you want to eat the banana right away and prefer it at room temperature, you can leave it outside the fridge for a while until it warms up to your desired eating temperature. Alternatively, you can use refrigerated bananas for smoothies or baking, where the texture changes won't be as noticeable.