大專食品英語ppt課件(編輯修改稿)
2025-02-01 09:38 本頁面
【文章內(nèi)容簡(jiǎn)介】 been identified as essential nutrients. In some instances， medical researchers seeking the cause of a particular disease found that problem was due to a single substance， and that when this substance was added to the diet， the symptoms of the disease disappeared. A number of vitamins were discovered in this way. ? 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. All of the nutrients except for mineral elements and water are classified as anic chemicals because they contain the element carbon. Mineral elements and water are inanic chemicals because they do not contain carbon. ? The vitamins are divided into two general categorizes based on their solubility in either water or fat .the fatsoluble vitamins are vitamins A， D， E， and K； the watersoluble vitamins include vitamins C （ ascorbic acid） ， niacin， thiamin， riboflavin， flacon （ also called folic acid） antithetic acid， pyridoxine， vitamin B12 and biotin. ? The mineral elements are divided into two categories based on the quantity of them that we need. Microelements are those needed in relatively large amounts， while microelements are those needed in very small amounts， some example of microelements are sodium ， calcium ， and phosphorus. Some example of microelements is iron， iodine， manganese， zinc， and fluorine. 營 養(yǎng) 素 ? 到目前為止，營養(yǎng)學(xué)家已確認(rèn) 40～ 45種物質(zhì)為必須營養(yǎng)素。然而，隨著不斷的鑒定出新的營養(yǎng)素，這個(gè)數(shù)目會(huì)進(jìn)一步增多。營養(yǎng)科學(xué)的歷史記載著多種食物怎樣被確認(rèn)為必須營養(yǎng)素的有趣的故事。在有些情況下，醫(yī)學(xué)研究者在尋找某種特殊疾病的病因時(shí)發(fā)現(xiàn)問題就由于缺乏某一種物質(zhì)上，并且發(fā)現(xiàn)當(dāng)把這種物質(zhì)加入到病人的飲食中之后，病癥便消失了。許多維生素就是這樣被發(fā)現(xiàn)的。 ? 根據(jù)人體需要量的不同，營養(yǎng)素可分為量大類：需要量大的稱為常量營養(yǎng)素（碳水化合物、脂肪、蛋白質(zhì)和水）；需要量少的稱為微量營養(yǎng)素（礦物質(zhì)和維生素）。除了礦物質(zhì)和水之外，所有其他營養(yǎng)素都屬于有機(jī)化合物，因?yàn)樗鼈兌己刑荚?。礦物質(zhì)和水都是無機(jī)化合物，因?yàn)樗鼈儾缓荚亍? ? 維生素按其可溶于水或脂肪分為兩大類：脂溶性維生素，有維生素A、 D、 E、 K；水溶性維生素，包括維生素 C（抗壞血酸）、煙酸、硫胺素、核黃素、葉酸、泛酸、吡哆醇、維生素 B12和生物素。 ? 礦物質(zhì)按人體需要量分兩類。人體需要量較大的稱為常量元素，如鈉、鉀、鈣、磷；人體需要量較小的稱為微量元素，如鐵、碘、錳、鋅、氟。 RECOMMENDED DIETARY ALLOWANCES ? Once a nutrient is identified， one of the principal research efforts of nutrition scientist is to determine how much of it is needed by people at various ages and stages of life. Initial studies usually are conducted with laboratory animals， but the information
教學(xué)課件相關(guān)推薦
鄂ICP備17016276號(hào)-1