Final answer:
The Set Point Theory posits that each individual has a genetically determined ideal body weight that is challenging to alter. Though the theory suggests a simple explanation for weight regulation, it overlooks the impact of environmental and social factors and has some empirical limitations.
Step-by-step explanation:
The theory that asserts that each individual has an ideal body weight that is resistant to change is the Set Point Theory. According to this theory, a person's ideal body weight, or set point, is seen as genetically predetermined. Efforts to shift weight significantly away from this set point are met with compensatory changes in energy intake and/or expenditure. However, it's important to note that the set point theory has its limitations. It does not fully consider the influence of environmental and social factors on body weight regulation, and some empirical evidence does not support all of its predictions.
Common factors influencing body weight include inactivity, genetics, metabolism, and the body's set point. While set-point theory offers an intuitive explanation for body weight regulation, the reality is often more complex, with factors like diet, physical activity, and societal pressures also playing significant roles.