Eating well during her pregnant

  Isabella is expecting her first baby and is very concerned about eating well during her pregnancy. She is eating more fruits, vegetables, and whole grains than she used to and has started to drink skim milk. She is also eating fish two or three times a week. She still eats some of her favorite foods, especially cheese and chocolate. What precautions should Isabella take to make sure that the foods she is eating are safe for her and her unborn child? Why is it especially important to take precautions to avoid infection with Listeria during pregnancy?