(1)Objectives: Effects of whey protein isolate long term consumption in comparison with soy protein isolate on appetite and calorie intake، anthropometric and metabolic indices, inflammatory and oxidative stress factors in healthy overweight and obese men. (2) Design: Randomized, double blind, control without placebo, clinical trial phase 3 (3) Setting and Conduct: After the completing the written consent, the participants are randomized in to either the WPI (to intake 60 grams whey protein isolate) or SPI (to intake 60 grams soy protein isolate).In this study participants of each group intake the supplements solved in 500 ml water 30 minutes before lunch .Before and after the study demographic questionnaire, IPAC and 24 recall are filled out. Appetite, Calorie intake, blood pressure, anthropometric measurement, body composition and plasma Glucose ,TC, VLDL,TG, LDL, HDL, Apolipoproteins a and b, HsCRP, MDA are measured. (4) Participants: 52 healthy overweight and obese men 30 to 65 years old. Inclusion Criteria: Healthy interested men between ages 30 to 65; BMI=25-40kg/m2; No usage of cigarette or drugs or alcohol; No usage of antioxidants; No usage of decreasing blood pressure drugs, decreasing blood lipids or decreasing blood glucose drugs; No usage of antioxidants, gain or lose weight supplements; No lose weight diets; No intake of high doses of caffeine during the last 3 months; No records of diabetes, high blood pressure, acute heart diseases or thyroid/kidney/liver diseases, blood disorders, infarction or other clinical problems increasing oxidative stress like injuries or sever burnings; No allergy to cow milk or soy; No sever weight change during the last month; No usage of drugs affecting body weight ( Hormones or antidepression drugs) Exclusion Criteria; Altering the activity levels or diets in comparison with the ones before the study; Compliance less than 70%
(5) Interventions: Intake of 60 grams of whey protein isolate or soy protein isolate
(6)Main outcome measures: appetite, body weight, body composition