This article presents the design of a conversational agent whose goal is to coach people who wish to improve their food lifestyle. The data gathering method is easy and especially fast in order to simplify the life of the user. The goals are defined by the user and the follow-up is done daily. Two choices are available to the user: reduce his consumption of meat or consume more fruits and vegetables. User tests were conducted with 36 people. Only 11% of the challenges were successful, but in 65% of cases, the tester has managed to improve its consumption compared to before.