On Body Fat and Body Water in Rats

Abstract

Under our experimental conditions, water represented 72% of the fat-free body mass. This constant was found to be completely independent of the magnitude of the fat depots. Consideration of the composition of various samples of adipose tissue suggests that the water to fat-free dry matter ratio is the same as in the body as a whole or that any "excess" water contributed by adipose tissue is so small in absolute amounts as to leave the global ratio essentially undisturbed. Rats exposed to cold had to draw on their fat stores during the first month of exposure but later replenished their energy reserves. The water to fat-free dry matter ratio was not affected.

Correlative Studies in Obese Children and Adolescents Concerning Body Composition and Plasma Insulin and Growth Hormone Levels

“…Wood specimens were obtained al -15, 0, 30, 00, 90, 120, 210, and 300 min during the oral glucose tolerance test and at -15, 0 1 , 0-, 30, 00, 90, 120, 180, 240, and 300 min during the protein-glucose meal. Time 0 1 indicates the time at which the meal was begun and time 0-when the meal was completed. The time required for ingestion of the test meal varied between 15 and 20 min in all of the subjects.…”

“…Lean body mass (L15M) and total body fat (TBF) were determined by the use of the Pace constant (0.72) [1,10]. Thus LBM and TBF may be determined from the following equation:…”

“…Expected body fat was also predicted from height according to the following equations [30] For the obese individual it is possible to assess body fat from body water [1,10] and subtract "expected fat" to obtain "excess fat." The identifying code numbers are the same as those employed in a previous communication [10] which describes in detail the body composition of these subjects.…”

Changes in lipid content of the montane vole

“…In others, changes have been most pro- 1 To whom requests for reprints should be directed. However, information regarding the immediate effects of cold and starvation on voles is scarce.…”

Effects of Semi-Starvation on the Total Body Composition and Absorptive Function of the Small Intestine of the Young Adult Female Rat

“…With the progressive loss of body weight, hair could therefore have been providing an increasing proportion of the measured body protein and, together with the ash component (which maintained its original weight), would have contributed to the steady decrease found in the percentage water in fat-free body matter. The constancy of the ratio of water to fat-free dry matter is emphasized in a number of reports (Pace and Rathbun 1945;Babineau and Page 1955).…”