Intermittent fasting has gained relevance in recent years because it allows for significant weight loss with improvement in cardiovascular risk factors similar to calorie-restricted diets without people having to track calories every day, or prohibiting people from eating certain food groups. However, there is no data about its usefulness in patients with weight gain after bariatric surgery, or its long-term effects(9). Research question: In patients with weight gain, being followed up in the obesity clinic, is intermittent fasting for 12 weeks, compared to calorie restriction, effective in terms of weight reduction? H0: Change in weight from baseline to 12 weeks less than 5% H1: Change in weight from baseline to 12 weeks greater than or equal to 5% Patients meeting the inclusion criteria will be identified. Once identified, they will be asked to participate in the study and, if they accept, they will be asked to complete and sign the informed consent form. The study will consist of three phases: a selection phase, an adaptation phase (1 to 2 weeks), a weight loss phase (12 weeks) and a maintenance phase (12 weeks). At the first visit, patients will be randomized to two types of nutritional interventions: intermittent fasting or caloric restriction. During the weight loss phase, biweekly follow-up will be performed to ensure adherence to the assigned dietary intervention. At the end of the 12 weeks, patients can decide whether to continue the assigned dietary intervention or move to a maintenance plan. Anthropometric measurements and body composition will be measured at baseline, 12 and 24 weeks.
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Weight loss (Kg)
Timeframe: 12 weeks