Emmy, you are right about the tape worms, they are little pigs:
They do eat all the food. In my History class, I learned about the tape worms being used to treat obesity, or to control weight. A women would be given the eggs; The tape worm would grow in her while eating all her food. She would drop the pounds and then a pill would kill the tape worm. After a while, this practice was stopped. It was due to spreading the eggs to family members who were oblivious, and never took the pill to kill the tape worms.
SisterBran is very thin. She is not too thin however. I would say she is perfectly thin. I remember a few months ago, she dropped a few pounds suddenly. She may have more to say about this.