Chrono-ALIGN: A Chronotype-Based Chrono-Nutrition Intervention in Post-Bariatric Patients

Inclusion Criteria: * Adults aged 18-50 years who underwent Sleeve Gastrectomy (SG) 6 Months prior to enrollment. * Have achieved ≥50% of excess weight loss post-surgery (to ensure initial success). * Current BMI between 25-40 kg/m². * No major postoperative complications and cleared for a regular diet by their healthcare provider. * Participants must be able to align their eating schedule within a daytime window (morning to evening), ensuring that the first meal is consumed in the early part of the day and the last meal is completed before late evening, in accordance with chrono-nutrition guidelines. Exclusion Criteria: * • Pregnancy or planned pregnancy during the study period, and post menopaused females * Current diagnosis of severe psychiatric illness that may interfere with adherence (e.g., untreated major depression, psychosis, severe eating disorders). * Active malignancy or serious chronic disease unrelated to obesity that may confound outcomes (e.g., advanced renal failure, uncontrolled liver disease). * Use of medications known to significantly alter circadian rhythm or metabolism (e.g., corticosteroids, melatonin therapy) within the last 3 months. * Inability to comply with study requirements (dietary interventions, sample collection, or follow-up visits).Participants who have previously undergone revision bariatric surgery. * Individuals following intermittent fasting regimens prior to the study.