Sadie is a 37-year-old teacher in her 20th week of pregnancy. she is 68 inches tall and weighs 195 pounds. her pre-pregnancy weight was 180 pounds. she gained 50 pounds with her first pregnancy two years ago. her doctor has recommended that she limit her weight gain during this pregnancy. she likes to swim but has not been exercising regularly since she found out she was pregnant. she has had morning sickness through much of this pregnancy and says that she feels better when she eats starchy foods such as bread, potato chips, and pasta. she complains of recent problems with constipation and is seeking ways to relieve her discomfort.