Workshop No. 1 will provide information on the goals of weight gain during pregnancy, and will target the implementation of recommendations in terms of diet during pregnancy. The messages will be specifically adapted to the population of obese women including dietary advices, work on erroneous beliefs and representations, work on the motivation to change eating habits and reduction of the harmful link between emotions and eating. Thus, beyond the information, this workshop will have the primary role to develop a diet suitable for pregnancy in obese women. This workshop will be led by a dietician and psychologist. It will take place between the 1st and 4th week of the program.