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Defining the genetic architecture of the predisposition to obesity: a challenging but not insurmountable task.

Obesogenic environment and behavior are fueling the rise in the prevalence of overweight and obesity. However, one should not omit biology from the discussion. Several lines of evidence support the contention that there are individual differences in the predisposition to gain weight and that genetic variation has much to do with the risk of becoming obese, particularly the risk of severe obesity.