Air, water and food from a sanitary standpoint / by Ellen H. Richards and Alpheus G. Woodman.

  • Richards, Ellen H. (Ellen Henrietta), 1842-1911.
Date:
[1904], [©1904]
Catalogue details

Licence: Public Domain Mark

Credit: Air, water and food from a sanitary standpoint / by Ellen H. Richards and Alpheus G. Woodman. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    and of fatness or leanness in animals, of method of prepara- tion or of combination in cooked foods. Therefore examinations of materials are imperative if there is to be any basis of calculation. In an institution where, for instance, flour forms two-thirds of the daily ration, if it contains the lowest per cent, of nitrogen it may not furnish sufficient proteid for a well-balanced ration, or if the meat used is very lean there may not be fat enough for the best nu- trition. The great variation in the proportion of water leads to many surprises, and the amount of unedible material is to be considered. The uneducated provider buys oysters under the impression that he is furnishing food of high value, and does not distinguish between potatoes and rice. In the present state of our knowledge, the best use to which we can put such tables and analyses is as a check against gross errors of diet, which are found with alarming frequency especially among children and students, those who can least afford to make them. References will be found in the Bibliography to works for further study along these lines. Dietaries.—A dietary is simply a known amount of food of known composition per person per day, week, or month. What is called a standard dietary is such a combination of food-materials as shall furnish the amounts held to be neces- sary. The following are examples of such standard dietaries: Approximate Amounts required daily by Nitrogenous, grams. Fats, grams. Carbohydrates, grams. Calories. Child of 6-9 62 78 IOO IOO 125 45 45 75 90 125 200 28l 380 450 500 1593 1890 2665 3092 3725 Adult at moderate work Adult at hard work... (In feeding experiments from 10 to 20 per cent, more must be allowed for waste and indigestibility.)