食品专业英语.docVIP

PAGE / NUMPAGES Lesson 1 Nutrition 1.Food might be defined as any edible substance that provides nourishment when consumed. 食物可定义为食后起滋养作用的任何可食用的物质。 We need them for energy, for building and maintaining body tissue; and for regulating body processes the three essential functions of foods in the body. 我们需要这些营养素来提供能量，构成和修补机体组织，调节机体生理过程。这是食物在人体内的三种基本功能。 Nutrition might be defined as the process whereby we obtain the essential nutrients and use them to make many other substances our bodies need. 营养可定义为人们赖以获得的必须营养素，并利用这些营养素来制造人体所需的其他物质的过程。 The term good nutrition implies that we are obtaining from our food all of the essential nutrients in the amounts needed to keep our bodies functioning and to maintain optimum health. A very simplified definition of good nutrition might be eating the right foods in the right amounts.” 由此可见，唯有营养素才是真正必需的，而正常提供营养素的则是食物。食物是维持生命所必不可少的，因此我们必须懂得各种食物的营养素含量，必须懂得哪些食物是各种各样营养素最丰富的来源，懂得怎样把它们配成有益健康的膳食。营养良好这一术语是指我们处在从食物中获取为保持机体正常活动和维持最佳健康状况所需的全部营养素。营养良好最简明的说法是：“适量食用恰当的食物”。 Nutrients might be divided into two genial categories based on the amount that we need. These are the macronutrients (carbohydrates, fats, proteins, and water), which we need in relatively large amounts and the micronutrients) mineral elements and vitamins), which we need in relatively small amounts. 根据人体需要量的不同，营养素可分为量大类：需要量大的称为常量营养素（碳水化合物、脂肪、蛋白质和水）；需要量少的称为微量营养素（矿物质和维生素） Recommended Dietary Allowances 推荐膳食标准,简写“RDA” National Academy of Sciences, National Research Council, And Food and Nutrition Board. 美国科学院全国科学研究委员会食品营养研究会 8.To allow for individual difference, the usually are set with a generous margin of safety. 考虑到个别的种种差异，RDA中通常规定了充裕的安全余量。 9.On the other side of the coin, receiving too much of certain nutrients, amounts significantly above the RDA, can be just harmful as not obtaining enough certain vitamins (such as A and D) and minerals can be highly toxic if high for optimal nutrient intake from the standpoint of both maximum and minimum levels. 另一方面，摄取某些营养素过多（大大超过 RDA），也有可能