That headline is almost certainly clickbait.

For most healthy people—even if you’re over 50—eating one banana a day is completely safe and generally beneficial. Bananas provide potassium, fiber, vitamin B6, and natural carbohydrates that support heart and muscle function.

The “could cause…” scare usually refers to one of these misunderstood ideas:

1. Too much potassium (hyperkalemia)
Bananas do contain potassium, but a single banana won’t push a healthy person into dangerous levels. High potassium becomes a concern mainly if someone has kidney disease or is taking certain medications that affect potassium balance.

2. Blood sugar spikes (diabetes concern)
Bananas do contain natural sugar, but they also have fiber that slows absorption. For most people, one banana doesn’t cause a problem. Even for people with diabetes, it can often fit into a balanced diet.

3. “Weight gain” myths
One banana is about 90–120 calories. It doesn’t cause weight gain unless overall calorie intake is excessive.

Bottom line

For most adults over 50, one banana a day is a healthy habit, not a risk. The only people who may need to limit potassium-rich foods like bananas are those with kidney issues or specific medical guidance from a doctor.

If you want, tell me the exact headline or article you saw—I can break down what it’s actually trying to claim.