What are the three lines of evidence that challenge fundamental aspects of many set-point theories of body-weight regulation?
What will be an ideal response?
(1) variability of body weight:
> a set-point mechanism should make it virtually impossibly for an adult to gain or lose large amounts of weight, yet many adults do!
> many people only avoid obesity by resisting those urges to eat
(2) set points and health:
> one implication of set-point theories is that each person's set point is optimal for that person's health, obviously not true
> free feeding levels of consumption are unhealthy
> all levels of dietary restriction substantially improved health and increased longevity, but the benefits were greatest in the mice whose caloric intake was reduced most
(3) regulation of body weight by changes in the efficiency of energy utilization:
> as a person's level of body fat declines, that person starts to use energy resources more efficiently, which limits further weight loss; conversely, weight gain is limited by a progressive decrease in the efficiency of energy utilization
You might also like to view...
Traditionally the animal(s) associated with hosting Brucella is/are
A. cattle. B. dogs. C. goats. D. pigs. E. All of the choices are correct.
List 4 of the most common seabird feeding methods and give examples of birds that utilize each method
What will be an ideal response?
How does a heterotrophic animal obtain energy?
a. by ingesting living or dead organic matter b. by digesting food externally c. by making its own nutrients d. by engaging in photosynthesis
The structure of the cartilaginous and bony fishes that detects vibrations in the water is the
a. anal fin. b. operculum. c. nostrils. d. lateral line.