Background: A balanced diet is important to maintain an optimal health status and to prevent noncommunicable
chronic diseases. The principal objective of this study was to analyze the effect of diets containing high fat
levels from different sources, on serum and thymus lipid profile, in adult rats.
Methods: Experimental diets contained 50% kcal of fat, provided by butter (B) or sunflower oil (S); control diet (C) was
isocaloric, with 15 kcal of fat per 100 total kcal, provided by soy oil. Diets were otherwise complete in all nutrients and
were administered for 40 days.
Results: Group B had higher levels of total cholesterol and triglycerides than C; S serum lipid profile did not differ from
C, despite the higher fat content. Regarding serum and thymus FA profile, B showed an increase of saturated fatty acids
and lower levels of ω6 and ω3 FA, and S had lower levels of ω3 fatty acids.
Conclusions: The administration of high-fat diets, during 40 days to adult rats, provoked specific variations on serum and
thymus fatty acids, as a consequence of differences in FA profile of their lipid sources. These results reflect the impact
that eating habits have on health status. It is important to put emphasis not only on the reduction of total fat intake, but
also on choosing healthy sources of fat, replacing saturated fatty acids by polyunsaturated and including oils with higher
content of ω3 to keep a balanced ω6/ω3 ratio.