The present research work aimed to study the effects of 3 nutritional food industry by-products (orange peels, peanut skin peels and pomegranate peel) on regulating blood glucose level. 66 male adult Sprague-Dawely rats weighing 125 ± 5 g each were used. These rats were injected with alloxan for inducing diabetes. The negative control group consisted of rats fed on basal diet, while the positive control group consisted of (3 -11) sub-groups fed on basal diet in addition to 5%, 7.5% and 10% of nutritional food industry by-products. After 4 weeks the effect of the different experimental diets on body weight gain, organs relative weight, blood glucose level, liver functions and kidney functions was recorded for the negative group and all the positive sub-groups. The results revealed that there was non-significant difference between all relative organ weights of liver, kidney and pancreas compared to control negative. Blood glucose level significantly decreased in all sub-groups compared to the control positive group.