There is another interesting difference between green and very ripe bananas.
Less-ripe bananas contain more resistant starch, while ripening converts some of that starch into simpler sugars. This means a greenish banana and a very ripe banana can have somewhat different effects on digestion and blood glucose.
That does not make one universally “good” and the other “bad.”
It simply demonstrates why the overall dietary pattern matters more than sensational claims about individual foods.
Chapter 3: The Potassium Question Doctors Pay Attention To
The most important issue with a high-banana diet is not that bananas are inherently dangerous.
It is potassium and individual medical circumstances.
Healthy kidneys play a major role in maintaining the body's potassium balance. They remove excess potassium through urine and help keep blood levels within a safe range.
People with impaired kidney function may not be able to eliminate potassium as effectively.
In such cases, eating large quantities of high-potassium foods can potentially contribute to hyperkalemia, a condition in which potassium levels in the blood become abnormally high.
Severe hyperkalemia can interfere with normal heart electrical activity and can become a medical emergency.
However, this does not mean that everyone with kidney disease must automatically avoid bananas.
Dietary recommendations vary according to kidney function, blood potassium levels, medications, and the individual's medical plan.
Certain medications can also affect potassium levels.
This is why someone taking medications that influence potassium should not independently make major dietary changes without discussing them with their healthcare professional.