Answer: Hello,For your age, you should probably weight between 91 to 119 pounds. It mostly depends on your physique. But for a healthy weight, you should weight between 91 to 119. An unhealthy weight for your height would be from 124 to 191 pounds.I hope this answered your question.
Answer: it depends upon your age, muscle mass, and your frame type, but your bmi is well within the range of normalcy. However, if you honestly think you are overweight, then you should probably see your doctor.
Answer: No they would die way before they could get that fat! No. The bones of a human being are not made to support this much body weight. Besides, it could not function as a human being. It is also absurd.
Answer: I cant say that you would loose a total of 30 lbs in a matter of 4 weeks, but low-carb diets, when done correctly provide a healthy weight loss. Typically the first week people loose 5-10 lbs from water weight and then slowly loose from there, depending on what your intake is like. If you arent sure how to do a low carb diet, Atkins is a more extreme form of it and can give you and idea of what your body is doing to loose that weight.
Answer: A BMI (body mass index) of between 18.5 and 24.9 is considered normal in the US and many other countries all though some countries might not follow the same guidelines. BMI=mass(kg)/height^2(m). A 58 inch girl would be considered normal weight if she weighs between 40kg(88lb) and 54kg(119lb). This is a very vague answer as the BMI does not consider percentage of body fat or muscles so a weightlifter might be considered obese if following the BMI, but he might be very fit and not fat at all.
The BMI is just a guideline, the most important thing is ones health and happiness :)