This clinical trial aims to recruit a core cohort of adults with normal weight, overweight, and obesity, but without other metabolic alterations, to undergo a six-month nutritional intervention. The main objective is to compare a genotype- and phenotype-based nutrition approach with a traditional nutrition plan adjusted only to phenotype. To evaluate the effectiveness of each type of intervention, anthropometric measurements and nutritional assessments will be collected at baseline, three months, and six months. In addition, plasma samples will be obtained to analyze clinical and non-clinical biomarkers, providing a more comprehensive evaluation of health status at baseline and after six months of intervention.