It is low in calories, in 100 g it contains only 11 kcal. It also has a low glycemic index.

An excerpt from the article 20 facts about watercress

It helps with constipation, has anti-cancer effects, boosts immunity, helps with liver disorders, and coughs, and modern phytotherapy recommends it to soothe nerves. It also lowers triglycerides and LDL cholesterol. It has a beneficial effect on blood clotting and helps with heavy menstruation.