By Emma Mackenzie You might not think it’s possible to keep bananas fresh this long, but it’s well worth a try. There are few fruits that pack as much of a nutritional punch as the banana – and ensuring you eat them regularly can help improve your mood and heart health, all while giving you an energy boost that really lasts, with no sudden crash afterward. With so many reasons to include bananas in your diet, it can be frustrating when any fruit or vegetable you have bought at the supermarket goes off before you have had time to eat it. But this hack could help keep your bananas fresh for an i…