Life sciences · Journal article
Revista Fisio&terapia. · September 23, 2026
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Obesity is one of the major public health problems, characterized by excessive accumulation of body fat and its direct association with the onset of chronic diseases. As a multifactorial disease, its treatment is considered a complex process, requiring individualized approaches involving behavioral changes and clinical and nutritional follow-up. Among alternative therapeutic strategies, intermittent fasting (IF) has gained prominence due to its potential effects on weight loss and metabolic control. Therefore, this study aimed to evaluate the effects of IF, applied as an isolated intervention, on the anthropometric and biochemical parameters of an individual with obesity. This was an intervention-based case study with a descriptive design and a qualitative-quantitative approach. The participant was a 25-year-old male diagnosed with obesity. Clinical and anthropometric data, dietary intake data, and laboratory test results were collected before and after the nutritional intervention. The protocol consisted of a 16-hour fasting period followed by an 8-hour period of unrestricted food intake, without additional nutritional guidance, while maintaining the participant’s usual dietary pattern. The study revealed slight but consistent reductions in the participant’s anthropometric measurements; however, dietary intake remained inadequate, characterized by a high intake of simple carbohydrates, low variety of fruits and vegetables, and frequent consumption of sugars and saturated fats, which limited the metabolic benefits of the protocol. Partial improvement in insulin sensitivity was observed, but the lipid profile worsened. Inflammatory markers also increased, indicating persistence of the inflammatory state characteristic of obesity. Renal and thyroid parameters remained within normal ranges. The participant reported improvements in sleep, well-being, and energy levels, despite experiencing initial episodes of weakness and headache. Thus, it is concluded that isolated IF promoted improvements in anthropometric and glycemic profiles but did not result in broad metabolic improvements due to poor dietary quality. Therefore, multidisciplinary follow-up combined with nutritional education is essential to optimize the effects of IF and reduce cardiovascular and hepatic risks.