Full resolution (JPEG) - On this page / på denna sida - XVII. Metabolism - III. Metabolism with various Foods
<< prev. page << föreg. sida << >> nästa sida >> next page >>
Below is the raw OCR text
from the above scanned image.
Do you see an error? Proofread the page now!
Här nedan syns maskintolkade texten från faksimilbilden ovan.
Ser du något fel? Korrekturläs sidan nu!
This page has never been proofread. / Denna sida har aldrig korrekturlästs.
914 METABOLISM.
of weight in the body may with the addition of carbohydrates produce
a deposit of proteins. This is apparent from the following table:*
Food. peer sh
Meat. Fat. Sugar. Starch. Metabolized. On the Body.
500 250 xg mit 558 — 58
500 a 300 eds 466 + 34
500 ds 200 cre 505 — 5
800 vee we 250 745 + 55
800 200 ae me 773 + 27
2000 ae ee 200-300 1792 +208
2000 250 ase yen 1883 +117
The sparing of protein by carbohydrates is greater, as shown by the
table, than by fats. According to Voir the first is on an average 9 per
cent and the other 7 per cent of the administration protein without a
previous addition of non-nitrogenous bodies. Increasing quantities of
carbohydrates in the food decrease the protein metabolism more regularly
and constantly than increasing quantities of fat. ATwaTER and BENE-
pict” also found that the carbohydrates had a somewhat greater sparing
action upon proteins than fats.
Because of this great protein-sparing action of carbohydrates the her-
bivora, which as a rule partake of considerable quantities of carbohydrates,
assimilate proteins readily (Voir).
The greater protein-sparing action of carbohydrates as compared with
that of the fats occurs, as shown by LANDERGREN,? to a sti!l higher degree
with food poor in nitrogen or in nitrogen starvation, in which cases the
carbohydrates have double the protein-sparing action as compared with
an isodynamic quantity of fat. This different behavior of the fats
and the carbohydrates is also shown in the experiments of RuBNER and
Tuomas * that on the exclusive feeding of sugar the nitrogen elimination
is reduced to the wear and tear quota while on the exclusive feeding of
fats the nitrogen requirement was about two to three times as great as
the wear and tear quota. |
The protein-sparing action of the carbohydrates and fats has generally
been studied through the one-sided feeding with one or the other of these
two groups of foodstuffs. The question may be raised whether the differ-
ence observed between the fats and carbohydrates could not also be
brought about by the simultaneous supply of carbohydrates and fat in
varying proportions, TaLLquist® made a series of experiments on this
1 Voit, in Hermann’s Handb., 6, page 143.
2 See Ergebnisse der Physiologie, 3.
2]. ¢., Inaug.-Diss., and Skand. Arch. f. Physiol., 14. Wimmer, Zeitschr. f. Biol.,
57, has given further proofs of the strong protein-sparing action of carbohydrates in
nitrogen starvation.
4See Thomas, Arch. f. (Anat. u.) Physiol. Suppl. Bd., 1910.
’ Finska Lakaresiillskapets Handl., 1901. See also Arch. f. Hygiene, 41.
<< prev. page << föreg. sida << >> nästa sida >> next page >>
