Final answer:
Genetic factors contribute to about 40-70% of the variance in obesity. Family studies have shown that when both parents are obese, 80% of their offspring will also be obese. Various genes controlling appetite and metabolism can predispose individuals to develop obesity.
Step-by-step explanation:
Genetic factors play a significant role in contributing to obesity. It is estimated that genetic influences account for about 40-70% of the variance in obesity. Various genes that control appetite and metabolism can predispose individuals to develop obesity. Family studies have shown that when both parents are obese, 80% of their offspring will also be obese, compared to less than 10% when both parents are of normal weight. Various genes controlling appetite and metabolism can predispose individuals to develop obesity.