Obesity, a widespread health concern, presents a clinical paradox: not everyone carrying excess weight develops the same metabolic complications. Some individuals remain metabolically healthy (MHO), while others progress to metabolically unhealthy obesity (MUO), facing severe risks like diabetes and heart disease. This critical review assesses the genetic underpinnings of this crucial distinction, focusing on the leptin receptor (LEPR), a key component in the regulation of our body's energy balance. Leptin, a hormone from fat cells, signals satiety through the LEPR. When genetic variations (polymorphisms) in LEPR disrupt this delicate signalling, it can lead to leptin resistance, a state contributing to weight gain and metabolic dysfunction. This review critically evaluates the evidence for how specific LEPR polymorphisms may influence the phenotypic divergence between MHO and MUO, highlighting the complex and population-specific nature of these associations. While variants like Q223R show inconsistent associations, others, such as K656N (rs8179183) and rs3790435, appear to directly contribute to the MUO phenotype by affecting fat distribution and inflammatory pathways. Understanding these genetic influences is paramount, as it shifts our view of obesity from a monolithic condition to a spectrum, revealing how individual genetic predispositions can dictate metabolic resilience or vulnerability. This work is crucial for developing more precise risk assessments and personalized interventions, ultimately paving the way for more effective strategies to promote metabolic health and mitigate the diverse impacts of obesity.
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