"Fasciola hepatica, the liver fluke, has a complex life cycle, requiring water snails as intermediate hosts. Humans and other mammals acquire the organism by eating cyst-contaminated water plants. Watercress is a common source of the parasite for humans. The cysts release immature flukes that migrate to the liver and gallbladder. A high load of the parasite may obstruct the biliary tract."

Enjoy your catercress sandwich.

I'd rather have a Pizza or a Big Mac anytime.