This can't be done, your body will be overwhelmed, and I can understand your mood too well, but if you only eat fruit and water every day, your blood sugar will be too high, and even you will get diabetes. Your obesity may be inherited or acquired. My advice to you is to pay attention to your diet, eat as little protein as possible, eat as little as possible or not eat dinner, and then you must exercise more. You must persist in exercising, and you can't stop exercising after exercising for a while. Just try and lose weight successfully. Focus on persistence,