Direct Measurement of Food Intake Behaviour in Obese Women Before and After Bariatric Surgery or Lifestyle Intervention

Inclusion Criteria: * Woman * Age between 18 and 67 years of age (standard for eligibility for bariatric surgery) * Patients must be able to adhere to the study visit schedule * Independently mobile * Patients must be able to give informed consent (IC) prior to any study procedures * Surgical (1) and non-surgical (2) groups: 1. Eligible for bariatric surgery (BMI \> 35 kg/m2 and clinically indicated bariatric surgery operation in agreement with the IFSO criteria) 2. Patients with a BMI of 30-40 kg/m2, who are planning to join the COOL-lifestyle program Exclusion Criteria: * Pre-operatively/lifestyle group: Factors impairing ability to consume meal such as: Significant dysphagia; Gastric outlet obstruction; Anything factor that prevents subjects from drinking or eating a meal * Post-operatively: Factors impairing ability to consume meal such as: Significant and persistent surgical complications or anything that prevents subjects from drinking or eating a meal. * Systemic or gastrointestinal condition which may affect food intake or preference (including diabetes mellitus) * Pregnancy or lactation, or planning to get pregnant during the study period * Patients who have an intolerance or allergy for one of the components of the test product (e.g. lactose) * Active and significant psychiatric illness including substance misuse * Significant cognitive or communication issues * Medications with documented effect on food intake or food preference * Participating in another scientific study at the same time, if