I weigh 127 pounds should I go on a diet
It all depends on how tall you are compared to how much you weigh. If you are five feet four inches and medium fame then not you shouldnt. There is a chart on it at http://www.healthchecksystems.com/heightweightchart.htm.
Check your BMI online. It should tell u roughly.
It depends how tall are you, your age, and gender. Go on www.google.com and type bmi test , it should show you if you are under-weight, normal, overweight and obese.
How old are you?