A Manual of physiology with practical exercises

by George Neil Stewart

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 ...these things are accomplished is very variable. Nevertheless, we may conclude that, for a man of 70 kilos, doing fairly hard, but not excessive, work, 20 grammes N and 300 grammes C are a sufficient and indeed a liberal, allowance. The 20 grammes N will be contained in 140 grammes dry proteid, which will also yield 70 grammes of the required C. The balance of 230 grammes C could theoretically be supplied either in 517 grammes starch or in 300 grammes fat. But it has been found by experiment and by experience (which is indeed a very complex and proverbially expensive form of experiment) that for civilized man a mixture of these is necessary for health, although the nomads of the Asian steppes, and the herdsmen of the Pampas, are said to subsist for long periods on flesh alone, and a dog can live very well on proteids and fat. The proportion of fat and carbo-hydrates in a diet may, however, be varied within wide limits. Probably no ' work' diet should contain much less than 50 grammes of fat, but twice this amount would be better; 100 grammes fat give about 75 grammes C, so that from proteids and fat we have now got 145 grammes of the necessary 300, leaving 155 grammes C to be taken in 350 grammes starch, or an equivalent amount of cane-sugar or glucose. Adding 30 grammes inorganic salts, we can put down as the solid portion of a good normal diet for a man of 70 140 grammes proteids = of body-weight. 100 „ fat = jis „ 350 „ carbo-hydrates= „ 30 „ salts. 620 Now, knowing the composition of the various food stuffs, we can easily construct a diet containing the proper quantities of N and C, by using a table such as the Economic and social influences--prices and habits--and not purely physiological rules, fix the di...

278 pages, Paperback

Published May 20, 2012

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1860-