im 27 years old, im 5'3" and i only weigh 85 lbs. i know im underweight but i think im healthy, i dont get sick or anything. my mom was 75lbs when she was my age; i think it runs in our family. i had applied for a life insurance three times in the last year and i was declined 3 times. they said its because i'm underweight. i'm going to the doctor tomorrow and i don't know what to tell him. what do i need to do? do i need some blood tests done? i need some advice please. thank you!