Tofu (Japanese: 豆腐, Hepburn: Tōfu, Korean: 두부; RR: dubu, Chinese: 豆腐; pinyin: dòufu) is a food prepared by coagulating soy milk and then pressing the resulting curds into solid white blocks of varying softness: silken, soft, firm, extra (or super) firm. Tofu is also known as bean curd in English. It is a traditional component of East Asian and Southeast Asian cuisines that has also been consumed in China for over 2,000 years. In modern Western cooking, it is most often treated as a meat substitute. Nutritionally, tofu is low in calories, while containing a relatively large amount of protein. It is high in iron, and can have a high calcium or magnesium content depending on the coagulants (e.g. calcium chloride, calcium sulphate, magnesium sulphate) used in manufacturing.