Impact of Ketogenic Diets in Preventing Relapse in Obesity Management

Inclusion Criteria: * weight stable over the last three months (\<2 kg) * not currently dieting to lose weight * inactive lifestyle (less than 150 min of physical activity weekly. * Given that some of the variables of interest have been shown to be affected by the phase of menstrual cycle in normally ovulating women, namely appetite and resting metabolic rate, only women taking oral contraceptives, with regular menstrual cycles or post-menopausal will be included in the study Exclusion Criteria: * pregnancy * breast-feeding * drug or alcohol abuse within the last two years * clinically significant illness including diabetes, gastrointestinal (particularly cholelithiasis), kidney (GFR \<60) or liver disease, osteoporosis (T-score \<-2.5) and osteopenia (T-score \<-1.5) * treatment with antiosteoporotic drug * depression or other psychological disorders * eating disorders * milk intolerance * current medication known to affect appetite/metabolism or induce weight loss. * a planned surgery during the study period * participating in another research study