Effect of nopal consumption on blood lipids. (A) Fasting serum triglycerides, (C) total cholesterol and (E) LDL cholesterol of rats fed control diet (C) or high fat diet +5% sucrose in drinking water (HFS) during 7 months (pretreatment period). After this period, obese rats were switched to one of the experimental diets for 1 month (treatment period): HFS, HFS + N, HFS-C, HFS-C + N; (B), (D and F). Values are shown as means ± SEM, n = 5. Statistical analysis of the pretreatment period was assessed by student t-test. Comparisons among groups after the treatment period were analyzed by two-way ANOVA followed by Fisher´s post-hoc test. Different letters indicate significant differences among groups, a > b > c > d, P < 0.05. Comparisons between 2 groups were analyzed by student t test.