Creature where it lives by parasitism in something

Everyone　rely　on somethings in the world, basically.
The parasitic worm will need it most among us.
The parasitic worm in the picture is a famous for them.
It　is called a tapeworm.
It is sometimes discovered in the human body.
It　become about 10meters at the maximum.
This picture tapeworm that came out from the bowels of the person is 8.8meters.
Some people drank this tapeworm to get thinner.
I think want to exercise rather than do that.