Which of the following produces a substantial increase in the caloric intake of laboratory rats and a significant increase in their body weight?
A) removing thiamine from their usual laboratory chow
B) adding thiamine to their usual laboratory chow
C) offering them a cafeteria diet, rather than their usual single-chow laboratory diet
D) sham feeding them
E) both C and D

Question

Quizplus · Accepted Answer

Offering laboratory rats a cafeteria diet, rather than their usual single-chow laboratory diet, produces a substantial increase in their caloric intake and a significant increase in their body weight. Adding thiamine to their usual laboratory chow or removing it does not have a significant effect on their caloric intake or body weight. Sham feeding involves tricking an animal into thinking they are eating, but not actually providing any nutrients, so it would not lead to an increase in caloric intake or body weight. Option E, both C and D, is incorrect because sham feeding alone does not lead to an increase in caloric intake or body weight.

Which of the Following Produces a Substantial Increase in the Caloric