DESIGN: Randomised clinical trial.
SETTING: Primary Health Care centres (PHCCs) in Catalonia, Spain.
PARTICIPANTS: Adults aged 18 to 40 years with criteria of obesity or overweight, consulting PHCCs for any reason and who provide written informed consent to participate in the trial.
INTERVENTION GROUP will receive a 12-month weight loss programme that implements recommendations of a Clinical Practice Guideline, complemented with a smartphone app designed specifically for this programme.
CONTROL GROUP will receive the usual care. The outcome measure will be weight loss at 12 months.
EXPECTED RESULTS: The investigators expect a higher weight loss in the intervention group than in control group.
