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:  Eligible for bariatric surgery (BMI > 35 kg/m2 and clinically indicated bariatric surgery operation in agreement with the IFSO criteria) 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