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The Effects of the Dietary Supply of Carbohydrate Upon the Response of the Human Respiratory Quotient After Glucose Administration

The George F. Baker Clinic, New England Deaconess Hospital and the Nutrition Laboratory, Carnegie Institution of Washington,¹ Boston

Two medical students were placed on diets for several days at three levels of intake of carbohydrates, namely approximately 350, 75 and 0 – 11 gm. per day, respectively. The respiratory exchange was measured on alternate days in the basal condition and for 3 hours after the ingestion of 50 gm. of glucose. The combustion of carbohydrates was calculated in the usual empirical manner from the respiratory exchange and the protein level of the day's diet preceding the determinations of the respiratory exchange.

The basal combustion of carbohydrates calculated to 3 hours averaged 12.0, 6.1, and 0 gm. for one subject, and 13.4, 7.1, and 2.1 gm. for the other subject for the three dietary levels.

The increase in combustion of carbohydrates after the ingestion of 50 gm. of glucose with one subject was 14.0, 8.7 and 7.9 gm. and for the other subject, 8.7, 5.9 and 4.8 at the three dietary carbohydrate levels.

Thus the level of carbohydrates in the preceding diet affected the basal combustion of carbohydrates noticeably, and to some extent the increases in carbohydrate combustion after ingestion of glucose, but not so much as one would expect when the demand for replacement of glycogen supply is considered.

The respiratory exchange measurements were made by Mr. Basil James and the diets were under the supervision of Miss Rosina Vance.

Manuscript received 5 July 1944.