This study was designed to investigate the effect of kefir consumption as a common dairy fermented product on keep the bodyweight balanced on high fat-fed streptozotocin-induced diabetic wistar rats which fed with a daily kefir gavage dose, also to examine any effects regards the abdominal circumference (AC) and body fat mass; observed results compared to normal male rats; Experiments were carried out on 60 albino male rats, with age 8 weeks, weighing about 220-250 g, after the adaptation period, male rats were divided randomly into two experiments by six groups: experiment Ⅰ included 3 non-diabetic ones and experiment ⅠⅠ included three STZ induced diabetes groups. The groups were fed as follows: group 1 received a standard diet and served as control. Group 2 was fed on a standard diet and kefir (0.7 ml/animal/day by gavage). Group 3 received a high-fat diet and kefir (0.7 ml/animal/day by gavage). The diabetic males of groups A, B and C were fed on a high-fat diet. Group B received in addition kefir (0.7 ml/animal/day by gavage), while group C was injected additionally with insulin (0.76 UI/200 mg BW/day); all the groups have the access to the drinking water all the time.; the bodyweight of normal and diabetic rat males was determined on 1^sttreatment day,and every week until the end the experiment plan (5 weeks) then all the groups were sacrificed with measuring the AC and weighting the fat mass; Summarizing it could be said; through all the work plan (5 weeks), all the six animal groups showed a significant increase in the mean body weight with a normal level in experiment Ⅰ unless in group 3 which fed on HFD and kefir, while in experiment ⅠⅠ kefir helps the diabetic treated group to not losing weight compared to the untreated one; similarity kefir neither affect AC nor relative fat weight.