菠菜常生长在秋、冬、春等寒冷季节,它肥嫩的叶片以及叶柄、根均可食用。它含多种营养物质,是人们喜爱的绿叶蔬菜之一,但是它含有一种具有涩味的物质———草酸,吃起来令人感到不舒服;有的菠菜草酸含量高达1郾23%(以干物计)。草酸,吃进人体里会引起血钙(血液中的钙质)降低;若经 Spinach often grows in autumn, winter, spring and other cold seasons. Its fatty leaves and petioles and roots can be eaten. It contains a variety of nutrients and is one of the people’s favorite green leafy vegetables, but it contains a substance with astringent taste --- oxalic acid, which is unpleasant to eat; some spinach oxalates contain up to 1 23% ( Based on dry matter). Oxalic acid, which is eaten into the body, causes blood calcium (calcium in the blood) to decrease;