Derek, a neuropsychology graduate student, works in a behavioral eating research lab. derek suggests to the lead investigator that injecting people with leptin will them lose weight.
his idea is quickly shot down by a classmate, who states, "not so fast, derek; "

a. as leptin increases, glucose absorption decreases
b. high levels of leptin inhibit insulin synthesis
c. leptin is metabolized by fat cells quicker than it is produced
d. obese humans already have high levels of circulating leptin

D

Explanation:

Obese humans already have high levels of circulating leptin

Leptin is a hormone secreted from fat cells that helps to regulate body weight. But in obese people they have unusually high levels of leptin. This is because in some obese people, the brain does not respond to leptin, so they keep eating despite adequate (or excessive) fat stores, a concept known as ‘leptin resistance’. This causes the fat cells to produce even more leptin.

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