you can also use the body mass index calculator to calculate your body mass index (or BMI - google it) to recheck my results.
Person 2: No! You have a normal weight!
Girl: My height is 164cm. and my weight is 65 kilos. Feel its rising! Is it ok?
Girl's BFF: It's ok, but you really should lose at least 10 kilos to reach your normal weight. Or you are going to look like shit in a couple years! Look at Jessica Simpson! Do you wanna look like that???
Girl: Oh gosh, of course I don't! I'll do my fucking best to avoid it!