Abstract
Rats of both sexes were fed diets containing 21% (wt) fat as beef tallow (BT), safflower oil (SO), or a 60:40 BT:SO mix (M). Some of each group were killed at 9, 12, 15, 18, and 21 months of age. Death by 15 months was significantly (P<.001) greater in SO rats than in other groups. Mortality in SO females was significantly (P<.005) greater than in SO males. A trend for longer life existed in M compared to BT rats. Platelet aggregation microscopically visible in the alveoli of SO males and thrombi in the pulmonary arteries of SO females suggest that death in these animals may have been related to dietary linoleate. Excessive production of prostaglandins may have induced platelet aggregation and possibly interfered with normal immune responses. Myocardial stellate scars were seen earlier in M males than in other groups. Areas of massive infarction and subsequent fibrosis of the heart were present in BT rats and M males at 15 months but not until 18 months in M females.
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Spindler, A.A., Dupont, J. & Mathias, M.M. Dietary fat saturation, mortality and heart and lung morphology of rats. AGE 1, 85–92 (1978). https://doi.org/10.1007/BF02432103
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DOI: https://doi.org/10.1007/BF02432103