Effects of Saturated Fat in Rats Fed Rapeseed Oil

Abstract

The effects of increasing the saturated fatty acids in a dietary vegetable oil composed mostly of unsaturated fatty acids were studied in rats. A mixture of palm oil and Swedish rapeseed oil fed for 4 weeks as 20% of a purified diet promoted weight gains which exceeded those obtained with Polish rapeseed oil of a similar content of erucic acid, and altered the proportion of saturated fatty acids in the tissues to reflect that of the diet. When methyl esters of saturated fatty acids were added to Swedish rapeseed oil, similar effects on weight gain were not observed, but methyl esters of fatty acids from corn oil and rapeseed oil were shown to be of less nutritional value than the original glycerides. From fatty acids of olive oil, glycerides containing 3% palmitic acid were prepared, and produced weight gains which did not differ significantly from those of rats fed Polish rapeseed oil with a similar content of palmitic acid and 20% erucic acid. The characteristic effects of rapeseed oil are, therefore, attributed to its low content of saturated fatty acids as well as its high content of erucic acid.

The Effects of Various Fat Supplements on the Nutritional and Pathogenic Characteristics of Diets Containing Erucic acid in Ducklings

“…Skeletal muscle changes, however, were not improved, but the vacuolar changes of the heart were increased in severity. Earlier Beare et al [4] demonstrated favourable effects on growth and food intake of rats when erucic acid was supplemented with HPO.…”

“…Earlier, erucic acid was also demonstrated as the cause of growth retardation of rats fed RSO [5]. While the evidences incriminating erucic acid as the cause of the nutritional and pathological effects of RSO seemed convincing enough, the deficiency of saturated fatty acids in RSO appeared to be also contributing to its poor nutritional characteristics [4], The present study comprises 2 experiments which were concerned with the effects of oils and fats of various fatty acid compositions on the nutri tional and pathogenic characteristics of RSO in ducks.…”

Removal of phenolic compounds in the production of high-quality canola protein isolates

“…The need for these changes came as a result of the extensive studies on the nutritional aspects of rapeseed. Enicic acid contained in rapeseed oil may cause hean, adrenal and ovarian tissue lesions in rats (Carroll and Noble, 1957;Beare et al, 1963). This led to the first development of low-enicic-acid rapeseed (LEAR) varieties that reduced emcic acid content from about 40% to 5%.…”

Increasing erucic acid content through combination of endogenous low polyunsaturated fatty acids alleles with Ld-LPAAT + Bn-fae1 transgenes in rapeseed (Brassica napus L.)

“…They are the major very long chain fatty acids (VLCFAs) in the seed oil, together accounting for 45-60% of the total fatty acid mixture. High levels of erucic acid in cooking and salad oil extracted from rapeseed have been associated with health problems (Beare et al 1963). Following identiWcation of a spontaneous rapeseed mutant with low erucic acid content, genetic studies have shown that this trait is under control of two loci that act in an additive manner (Harvey and Downey 1964;Kondra and Stefansson 1965).…”