"Improving Health and Reducing Chronic Disease Risk in Middle-Aged Adults Through Nutrition"

Inclusion Criteria: * BMI 27-40 Kg/m2 * Metabolic syndrome according to International Diabetes Federation Task Force on Epidemiology and Prevention; National Heart, Lung, and Blood Institute; American Heart Association; World Heart Federation; International Atherosclerosis Society; and International Association for the Study of Obesity * Stable weight in the last 3 months (weight changes \< 4Kg) * Be able to give informed consent Exclusion Criteria: * Have a diagnosed illness that interferes with the recommendations proposed in the intervention. * Women with established menopause. * Pregnant or breastfeeding women. * Serious psychiatric illness/disorder. * Social, cultural or psychological factors that may affect adherence to the intervention protocol. * Inability to communicate with study staff. * Inability to follow recommended diet or inability to engage in physical activity. * Low likelihood of modifying dietary habits according to the different stages of change according to the Prochaska and DiClemente model. * Difficulty attending scheduled appointments within the intervention due to work schedule conflicts, travel plans, scheduled surgeries, among other reasons. * Therapeutic non-compliance. * Participating in a professionally-led nutritional intervention. * Being under medical treatment that affects weight, intake or energy expenditure in the 3 months preceding the start of the study. Smokers who have changed their smoking habit in the 6 months preceding the start of the study (including starting or stopping smoking). \- Participation in another trial that may interfere with this proposed study.