Bananas are a convenient source of carbohydrates, potassium, vitamin B6, and other nutrients, but the nutritional profile changes as a banana ripens. The color of the peel can give you a useful clue about how sweet the fruit will taste, how firm it will be, and how its carbohydrates are distributed.
Green bananas are less ripe and contain more resistant starch than fully ripe bananas. Resistant starch is a type of carbohydrate that is not completely digested in the small intestine and can act somewhat like dietary fiber. Because of this, green bananas tend to be firmer, less sweet, and can be a useful option for people who prefer  foods with a lower level of sweetness. They can also be more difficult to digest for some people and may cause bloating or gas if eaten in large quantities.
As the banana changes from green to yellow, some of the starch is converted into simpler sugars. The fruit becomes softer, sweeter, and easier to eat. A yellow banana still provides potassium, vitamin B6, fiber, and other nutrients, making it a convenient choice for breakfast, a snack, or a pre-exercise meal.
A yellow banana with a few brown spots is usually even sweeter and softer because more of its starch has been converted into sugars. It remains nutritious, and the presence of brown spots does not automatically mean that the fruit has gone bad. Many people actually prefer bananas at this stage because they have a stronger flavor and creamy texture.
Very brown or heavily overripe bananas are particularly useful for cooking and baking. Their sweetness makes them excellent for banana bread, pancakes, muffins, smoothies, and oatmeal, allowing you to reduce the amount of added sugar in some recipes.
So which banana is healthiest?
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