Which of the following is used by the text author to explain why people exhibit differences in metabolic efficiency?
A) Metabolic efficiency is advantageous for surviving in an environment where calories are hard to obtain.
B) Metabolic efficiency results in obesity but does not result in health disorder.
C) The excessive accumulation of fat is a social proxy for wealth.
D) Obesity allowed hunter-gatherers to forage for long periods of time.
E) Genetic mutations involving metabolic efficiency are quite common.
Question 2
Which of the following supports the notion that heredity contributes to differences in body weight?
A) Pima Indians in the US and Mexico share the same genes, but only those persons who live in a particular environment develop obesity.
B) Several forms of human obesity involve a deficit in ghrelin production, which can be treated by ghrelin injection.
C) Twin studies indicate that genes account for 25 percent of the variability in body fat accumulated when people are fed a high-fat diet.
D) Twin studies indicate that genes account for little of the variability in body fat accumulated when people are fed a high-fat diet.
E) Adoption studies fail to show a role for heredity in obesity.
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