Obesity in pregnancy is a global problem with current guidelines to combat the issue. The purpose of this quantitative, quasi-experimental project was to determine if the implementation of the Institute of Medicines (IOM) Gestational Weight Gain (GWG) guidelines would improve the rate of identification of obesity (BMI<30) in and the rate of pregnant patients receiving standardized nutritional education on healthy weight gain in an obstetrical clinic in urban California over four weeks. Pender’s health promotion model and the theoretical domains framework by Minchie guided this project. The total sample size was 833, n=464 in the comparison group and n= 369 in the intervention group. Using a Mann Whitney U for independent samples, no statistically significant difference was noted in the rates of identification of obesity (U = 92386.5, p =.946). A one-tail t-test was conducted regarding the rate of pregnant patients receiving standardized nutritional education on healthy weight gain (X² = 17.1629, p=.000) which was statistically significant. There was clinical significance noted with a 21.6% increase in patient receiving nutritional education. Even though statistical significance was not found in the rates of identification of obesity, the IOM guidelines provided a needed area for reinforcement measurement to enhance provider and patient awareness on healthy gestational weight gain. Therefore, the findings suggest that continuous utilization of the IOM GWG guidelines may improve the identification and subsequent nutritional counseling of obese pregnant women. Replication of the project is needed in larger settings and over a longer period of time.