Inclusion Criteria: Study participants :  must be 12-17 years old to ensure proper compliance with the study protocol and similar daily routines (i.e. attend high school); have normal weight or obesity according to World Health Organisation criteria  Exclusion Criteria: Individuals will be excluded if they :  follow a specific diet or have food allergies; have an eating disorder (e.g. anorexia or bulimia); have a metabolic disease, are taking supplements or use medication that could influence the study results (e.g. insulin, lipid lowering drugs, corticosteroids); are vegetarian or vegan, who cannot eat our validated meals which contain protein from animal sources; have any intestinal disorders; have physical limitations that restrict them from participating in our EX program; are involved in competitive sports; are not able to read or speak either French or English; currently has COVID-19 or do not agree to respect sanitary measures during the visits; or, smoke or use drugs.