Probiotics are useful for controlling weight gain, preventing obesity, reducing fat deposition, improving energy metabolism, enhancing insulin sensitivity, treating obesity and treating insulin insensitivity. The purpose of this study is to compare the effects of the traditional low fat probiotic yogurt (containing of Lactobacillus acidophillus and bifidobacters) versus low fat yogurt on body weight, abdominal adiposity and other body measures in obese adults that receiving a low calorie diet, according to the protocol of Novin diet Clinic. 80 healthy subjects with BMI 25-45 kg/m2 and waist circumference > 88 cm, non smoking, no-menopause, good general health, normal lipid level (healthy obese), no-diabetes were participated. Participants that intake antibiotic or any drugs with purpose decrease blood glocuse or blood pressure or with abnormal thyroids hormons or become peregnant Will be excluded. Participants received diet according to Novin diet Clinic program for weight loss. Before the inclusion, patients were answered about amount and type of yogurt consumption. A 2 weeks probiotic dairy products washout period prior to intervention initiation was used. People who consumed 200-400 gram yogurt per day allowed to participate to the study. We randomly assigned participants to consume 400 g per day of conventional (n=40) or the probiotic group (n=40) for 12 weeks. Compliance was assessed by 3 days food record in the initiation, medium and end of study. Body weight is the main outcome of the study.