Is Banana Good for Weight Loss or Weight Gain ? Is Banana fattening ? Can Banana Help me Lose Weight? These are some common questions that I have been encountering very often. Hence, I decided to make a video on this topic to clear the air. Their is no second thought to this, that Banana is highly nutritious, it’s the most commonly available and easily affordable fruit. But whether it will help you lose weight or gain weight will depend upon how and when you eat it. And that is what we have tried to explain.