________ refers to a genetically influenced weight range for an individual that is maintained by biological mechanisms that regulate food intake, fat reserves, and metabolism.

The term you're looking for is "Set Point Theory." Set point theory suggests that each person's body has a genetically determined range of weight and temperature that their body will try to maintain to stay at optimal health. This set point varies from person to person and is a sort of 'thermostat' for body weight.

According to this theory, the body will resist weight change when a person attempts to alter their body weight intentionally, such as through dieting or overeating. The theory posits that individuals have a certain amount of body fat that their bodies strive to maintain. When people lose weight, their bodies may respond by lowering their metabolic rate — the rate at which they burn calories — to conserve energy and restore the lost body fat. Conversely, if someone gains weight beyond their set point, the body might speed up metabolism to return to the previous level.

The set point is maintained through various feedback mechanisms in the body, involving hormones such as insulin and leptin, that influence hunger, satiety, and energy expenditure. While the set point can theoretically change, it is thought to require significant and sustained lifestyle changes, such as long-term changes in diet, exercise habits, and environmental factors.