Only if you cannot take excess potassium you can eat banana . Unless you describe the article why it was mentioned it is not possible to comment Like Most Fruit, Bananas Are Very Healthy. They contain fiber, potassium, vitamin C, vitamin B6 and several other beneficial plant compounds. ... Although bananas are unsuitable on a low-carb diet and may cause problems for some diabetics, overall they are an incredibly healthy food.Adults should consume about 3,500mg of potassium per day, according to the UK's National Health Service. The average banana, weighing 125g, contains 450mg of potassium, meaning a healthy person can consume at least seven-and-half bananas before reaching the recommended level.