Obesity is a risk factor for many chronic diseases. Therefore, the research aimed to compare between the impact of green tea and black tea on weight loss and nutritional status of obese rats. Female rats(42) from the Wister strain were used in the study their weight ranged (150 ±2 gm). The animals were fed on high fat meal to increase the weight .Except for the negative control group which was fed on a standard meal. After the weight gaining phase, (24 weeks) the overweight animals were divided into five groups: a positive control group was fed on a standard meal and drank water , and four experimental groups were fed the standard meal and drank green or black tea instead of water. They were as follows: two groups drank green tea at concentration of 4% or 6%, and two groups drank black tea at concentration of 4% or 6%.   The experiment continued for 10 weeks .Weights, lengths, the index of obesity in animals, weights of internal organs, and food and drink intakes  and food efficiency were estimated. In addition, estimation was done for body fat (internal organs fat, muscles fat), and for leptin hormone level. The results showed that  drinking green and black tea led to a decline in weight .As will as a decrease in the level of lipten hormone resulting from weight decrease. Also the organs fat and muscles fat were decreased .Generally it was concluded that increasing of green tea showed better results than black tea and that  green tea is effective in reducing weight and body fat when compared with black tea. This is because green tea contains catchins and EGCG at higher levels than that in black tea.