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Effects of the Dietary Carbohydrate-Fat Combination on Changes in Lipid Metabolism Induced in Rats by Amino Acid Imbalance1,2,

Louise Williams and Catherine Carroll

Home Economics Department, Agricultural Experiment Station, University of Arkansas, Fayetteville, Arkansas 72701

A study was conducted to evaluate interrelated effects of type of carbohydrate and fatty acid content of fat in the diet on lipid accumulation in liver of rats fed imbalanced protein diets, deficient in threonine. Regular and high oleic safflower oils were each combined with fructose and with glucose in both balanced and imbalanced protein diets. Rats were fed for 3 weeks. Rats fed fructose-imbalanced rations accumulated more liver lipid than rats fed glucose-imbalanced rations. The only significant differences attributable to the type of safflower oil fed were in fatty acid content of liver and adipose lipids. Liver fatty acids from all rats fed imbalanced rations had a pattern of reduced 18:0, increased 16:1 and 18:1, and a higher 18:2/20:4 ratio as compared with those from rats fed a balanced ration. These differences were accentuated by fructose. This pattern existed with either oil, although the absolute percentage of each fatty acid was a reflection of the dietary oil.

KEY WORDS: • carbohydrate • fatty acids • threonine deficient • fatty liver

1 Published with the approval of the Director of the Arkansas Agricultural Experiment Station.

2 Supported in part by Public Health Service Research Grant no. AM-04854 from the Institute of Arthritis and Metabolic Diseases.

Manuscript received 26 December 1972.




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