Final answer:
The primary reason people fail to self-regulate their bodily appetites that is not among the three listed is Lack of Genetic Variation. Instead, factors like Lack of Awareness, Lack of Motivation, and Lack of Executive Functioning are responsible for difficulties with self-regulation in eating.
Step-by-step explanation:
When discussing reasons for the failure to self-regulate bodily appetites, including eating, people generally fail for reasons like Lack of Awareness, Lack of Motivation, and Lack of Executive Functioning. These factors can affect how individuals regulate their hunger and eating behaviors. Lack of Genetic Variation, on the other hand, is not one of the primary reasons people fail to self-regulate their appetites. Thus, the correct answer to which one of the following is not a reason people fail to self-regulate their bodily appetites is D. Lack of Genetic Variation.
Studies indicate that while genetic factors may contribute to obesity and certain eating disorders, they are not typically cited among the immediate reasons for a lack of self-regulation in eating. Instead, issues such as a failure to recognize hunger cues (lack of awareness), not having the drive to adhere to healthy eating (lack of motivation), or being unable to plan and execute dietary choices (lack of executive functioning) are more directly responsible for difficulties with self-regulation.