Dr. welch disagrees with the idea that our weight has a set point; instead, he prefers the term settling point. which of the following observations seems to support the idea of a settling point? a. the prevalence of obesity is just as great in developing countries as in north america. b. although laboratory mice and rats will overeat if given a variety of foods to eat, animals in the wild will eat only enough to maintain a normal body weight. c. sustained changes in body weight can alter one's set point, and psychological factors also sometimes drive our feelings of hunger. d. even when people are given medications that boost brain levels of serotonin, their weight will gradually decrease with age.