The reason why macaroni is called cramp cabbage is because water spinach contains a large amount of oxalic acid substances. These oxalic acid substances will affect the absorption of calcium ions. When reaching a certain level, twitching of the limbs will occur, so It's called cramp dish.

Ipomoea aquatica (Latin name: Ipomoea aquatica Forsk), also known as water spinach, water spinach, spinach, rattan, and spinach, is a plant of the Ipomoea genus Photocalyx group.

This species is native to East Asia and is now widely cultivated as a vegetable, or sometimes grows wild. It is commonly cultivated in Fujian, Guangxi, Guizhou, Sichuan, Fujian, Jiangsu, Sichuan, Guangdong and other provinces in central and southern China. It is less common in the north. It should be grown in a warm and humid climate with fertile and humid soil. It is not cold-tolerant and will freeze stems and leaves when exposed to frost. Withered.