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Studies on the Comparative Nutritive Value of Fats

XII. The Digestibility of Rapeseed and Cottonseed Oils in Human Subjects¹

Departments of Biochemistry and Nutrition, and of Medicine, University of Southern California School of Medicine and The Rancho Los Amigos, Los Angeles County Department of Institutions, ³ Los Angeles

1. The digestibility of rapeseed oil has been found to be 99% in normal men, while that of cottonseed oil was found to be 96.7% when the excretion of soap is also considered.

2. While the differences in values between these fats are only slight, they are apparently significant. They result from the somewhat greater excretion of soap in the cottonseed oil tests.

3. The results using rapeseed oil prove that a species difference obtains in respect to digestibility between man and the rat.

4. A basic diet containing a minimum quantity of fat was employed which avoids monotony and provides an appetizing and varied menu.

This paper reports research undertaken in cooperation with the Quartermaster Food and Container Institute for the Armed Forces, and has been assigned number 247 in the series of papers approved for publication. The views or conclusions contained in this report are those of the authors. They are not to be construed as necessarily reflecting the views or indorsement of the Department of the Army.

Contribution no. 209 from the Department of Biochemistry and Nutrition, University of Southern California.

² Address: Harriman-Jones Clinic, Long Beach, California.

³ We wish to thank Mr. W. R. Harriman, Director, and Dr. Douglas W. Ritchie, Medical Director, Rancho Los Amigos, for making arrangements for this study.

Manuscript received 9 March 1949.