An overweight adult who has been overweight all of his life, experiences easy weight gain after successful weight-loss attempts, and feels his genes are resisting his efforts at weight loss is illustrating a belief in .

set point theory                                                                        

Explanation:

Set point theory: The term "set point theory" is described as a phenomenon that suggests that an individual's body weight is being regulated at a preferred or predetermined level through a "feedback control mechanism". However, in an adult, body weight is being maintained at some "relatively stable level" for quite a long period in time. In other words, it refers that an individual's body will fight to "maintain" a specific body weight.

In the question above, the given statement illustrates the set point theory.

the anti federalists was a movement that was opposed to the creation of a us federal government. although they were not as organized as the federalists, they also had a large group of leaders, especially in state politics.

the statement "now, in a large extended country, it is impossible to have a representation, possessing the sentiments, and of integrity, to declare the minds of the people” represents the concerns of the anti federalists.

they strongly believed that the federalists were representing the interests of aristocratic elements of society at the expense of the majority of ordinary people, who lived in a rural society.

their fear for the creation of a strong federal government and the president’s power of veto in their opinion would create a tyrannical rule that would dominate the people. they defended the importance of restraining the government’s power towards people at any cost.