Twin and adoption studies show that the heritability of weight and body fat is high, with estimates falling between 0.40 and 0.70.

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This statement is true. Twin and adoption studies have indeed shown high heritability estimates for weight and body fat, typically falling between 0.40 and 0.70. This suggests that genetics play a significant role in determining an individual's propensity for gaining or losing weight. However, it is important to note that environmental factors, such as diet and exercise habits, also play a role in weight management.

Twin and Adoption Studies Show That the Heritability of Weight