Are you considering it not healthy because of sugars or something else?
Yup, it's not even close to being low calorie at all -- especially if you use apple juice or vanilla bean paste. Depending on OPs sugar tolerance, it may be too bitter if the banana isn't super ripe or large enough, thus requiring more. Sure, it's better than a Coke or a store-bought juice, but unless your goal is to just eat more fruits or less processed things, it's not going to help a lot. It is, however, quite tasty!