前言维生素是维护身体健康、促进生长发育和调节生理机能所必需的一类有机化合物。它们不参加机体组织的构造,也不供给热能,但能帮助机体的新陈代谢,起到酶、激素一样的作用。例如,维生素A 可形成视紫质(Visual Purple),帮助眼睛保持良好的视力;维生素D 可帮助肠道钙质的吸收,分解合成磷质来形成骨头;维生素B_1能帮助食物进行同化和消化,促进食欲。当 Preface Vitamins are a class of organic compounds necessary for the maintenance of health, growth and development and the regulation of physiological functions. They do not participate in the structure of the body tissue, nor does it provide heat, but can help the body’s metabolism, play the same role as enzymes, hormones. For example, vitamin A can form Visual Purple to help the eyes maintain good eyesight; vitamin D can help intestinal absorption of calcium, the decomposition of synthetic phosphorus to form bones; vitamin B_1 can help food assimilation and digestion, Promote appetite when