When allocated to the control arm patients will receive the standard of care combined with the foreseen questionnaires and bio-electric impedance analysis for body composition and ergospirometry. When the patient is allocated to the interventional arm she will receive a 12-week lifestyle modification program prior to her fertility treatment. The lifestyle modification program will consist of dietary advice, advice for physical activity and emotional support. After the 12-week program the fertilty treatment will start as per routine practice. Questionnaires, ergospirometry and bio-electric impedance analysis will also be performed at the foreseen moments.
Patients will be randomly assigned to a group where they undergo a 12-week lifestyle modification program prior to their fertility treatment, or a group where they are entitled to start their fertility treatment without prior lifestyle modification program.