Inclusion Criteria:  Children from the first year of primary school in Lille City Overweight or obese children as defined by the IOTF and/or with at least one of the following risk factors: 1) early adiposity rebound (before 6 years old), 2) an upward crossing of major percentiles on the BMI curve (after 6 years old). Children whose legal tutor(s) is(are) able to understand the enlightened information. Children whose legal tutor(s) has(ve) signed the free and informed consent.  Exclusion Criteria:  Refusal from children or their tutors to participate in the study. Impossibility to participate in the study in its totality. Pathology known to impact the BMI: follow-up care for eating behaviour problems, endocrine disorders (hypercorticism, hypothyroidism, growth factor deficiency, hypothalamic-hypophysis lesions), genetic disorders (Prader Willi syndrome, Bardet-Biedl syndrome), drugs that affect body weight (antidepressant, neuroleptics, corticoids). Previous participation in a similar educational program.