This study was carried out to evaluate the antioxidant (anticarcinogenic) effect of some vegetables (celery, green pepper and broccoli) to prevent the risk of precrcinogenic diets (10% oil used several times for fring) in the experimental animals. The results showed that the animals treated with vegtables exerted a positive effect on daily body weight, food conversion  ratio, triglyceride, low density  lipoprotein cholesterol (LDLc,) cholesterol, and total lipid. The inhibitory effect of vegetables on liver and renal function which was demonstrated by decreased concentrations of aspartate amino transferase  (AST), (ALT),  uric acid  and creatinine. It could be also shown from results that vegetables diet caused significant effect in some blood parameters and blood picture. Also, laboratory  analysis  had beneficial effect on relative weight of liver, spleen, kidenys and brain. The experimental rats showed different pathological changes varied from mild to sever inflammation and adenoma in different organs of spleen, brain, liver, and kidneys. From this study, it is concluded that, consumption of vegetables can lower the risk of very fried oil.