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Alcohol and Alcoholism Vol. 36, No. 4, pp. 298-303, 2001
© 2001 Medical Council on Alcoholism

The effects of a liquid ethanol diet on nutritional status and fluid balance in the rat

Mariann R. Piano,*, James Artwohl1,, Shann Dixon Kim,2 and Gerry Gass,3

Department of Medical–Surgical Nursing, University of Illinois at Chicago, 845 S. Damen (M/C 802), Chicago, IL 60612,
1 University of Illinois at Chicago, 845 S. Damen, Chicago, IL 60612,
2 School of Kinesiology, University of Illinois at Chicago, 909 W. Roosevelt Road, Chicago, IL 60608 and
3 Baxter Laboratories, Round Lake, Illinois, USA

Received 9 August 2000; in revised form 16 January 2001; accepted 29 January 2001

The liquid ethanol diet is a widely used method of ethanol administration. The purpose of this study was to evaluate fluid balance using a multitude of physiological parameters (electrolytes, osmolality, total serum proteins, fluid intake/output and body weight), during and after the introduction of liquid ethanol diet. Animals were randomized into four different dietary protocols (two control and two ethanol groups) and were placed in metabolic cages for 16 days. Serum electrolytes, as well as the above parameters, were measured before, during and 1 week after the introduction of 9% (v/v) ethanol-containing diet (Lieber–DeCarli: LD). After the first night on 9% (v/v) ethanol LD, animals had significantly decreased diet consumption, urine output and body weight. However, a major finding of this study was that, during the habituation phase, the electrolyte values remained within the normal range for rats and, in particular, serum sodium was not altered at any time point measured in this study. Based upon the findings from this study, it is recommended that body weight be carefully monitored as a measure of the animal's equilibration and physiological adaptation during the initiation of a liquid ethanol diet, since neither the serum sodium nor calculated osmolality values were changed. Our results also highlight the need to offer water to animals during the habituation phase of ethanol consumption. This is because ethanol rats that were offered water ad libitum lost less weight than groups that did not receive water ad libitum, despite consuming the same amount of LD diet.


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