Obesity is defined as an abnormal or excessive accumulation of body fat and currently is one of the most public health problems. The objective of the study is to determine the relation between human obesity and several related parameters that may affect fertility in both sexes, two hundred adult(100)males and (100) females aged 21 to 25 years were volunteers for the study.  A questionnaire was completed on eating habits, focusing on the number of daily meals, meal composition, and sedentary lifestyle habits. An anthropometric assessment was also performed, including weight, height, BMI, skin-fold thickness, waist and arm circumference.  Also, some sexual male and female hormones were determined. The results revealed that the mean age of males were 23± 1.45 y and for females were 23±2.05y. Calories,total fat, carbohydrate, phosphorus,potassium, vitaminA,B2 and niacin together with cholesterol intake by obese volunteers were higher than the recommended dietary allowances. Both genders had BMI more than 40; BMI of females was higher than males.The mean value of cholesterol, triglycerides and VLDL-c for obese males and females were higher than normal range. Obese male showed an increase in serum levels of leptin, prolactin PRL estrogen and E2, accompanied with marked reduction in serum testosterone (T),dehydroepiandrosterone (DHEA) and T/ Estrogen E2 ratio. Obesity in  females showed reduction in the levels of progesterone and estrogen while it caused an increase in luteinizing hormone,follicle-stimulating hormone, leptin and prolactin. Therefore, it was important to keep attention to obesity as an etiology of male and female fertility and change the lifestyle of young obese female and male.