Which of the following is correct regarding leptin?
A) Ob mice lack the gene that codes for ghrelin.
B) Leptin produces a decrease in metabolic rate.
C) Leptin stimulates eating.
D) Leptin levels in the blood are proportional to the fat stores of the body.
E) leptin release is stimulated by the entry of food into the duodenum.
Answer: D
Rationale: Leptin levels in the blood are proportional to the fat stores of the body.
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