Complete Book of Vitamins pdf epub mobi txt 電子書 下載 2024


Complete Book of Vitamins

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发表于2024-11-23

Complete Book of Vitamins epub 下載 mobi 下載 pdf 下載 txt 電子書 下載 2024

Complete Book of Vitamins epub 下載 mobi 下載 pdf 下載 txt 電子書 下載 2024

Complete Book of Vitamins pdf epub mobi txt 電子書 下載 2024



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CHAPTER 1<br >Vitamins: What They Are<br >and What They Do<br > Despite all the talk about vitamins today, few people actually<br >know what they are and why they are so important. Vitamin re-<br >search goes on constantly, new discoveries are reported from<br >time to time, but scientists are all too aware that they don t know<br > all of the facts about all of the vitamins. Today 15 vitamins have<br > been recognized and analyzed. Scientists believe that again as<br > many probably exist and are essential for our health.<br > Vitamins are organic food substances--that is, substances<br > that occur naturally only in living things, plant or animal. They<br > exist in foods in minute quantities; they are absolutely necessary<br > for proper growth and the maintenance of health. Plants manu-<br > facture their own vitamins. Animals obtain theirs from plants or<br > from other animals that eat plants. Some animals manufacture in<br > their own bodies some of the vitamins they need.<br > It was around the turn of the century that someone first<br > suspected there might be more in foodstuffs than fats, proteins,<br > carbohydrates, and minerals. Laboratory experiments showed<br > that even when all those elements were present in the diet, labo-<br > ratory animals could still die of malnutrition. Scientists began to<br > search for this important missing link. They discovered vi-<br > tamins. The name comes from vita (life) plus amine (the<br > chemical compounds that were originally thought to be vi-<br > tamins). 3<br >

Complete Book of Vitamins 下載 mobi epub pdf txt 電子書

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