The observation that an animal or person exposed to an unchanging diet will eat less than if they had access to a variety of foods has been called the:

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Sensory specific satiety refers to the decrease in enjoyment and desire for a specific food that occurs after consuming that food, leading to a decrease in overall food intake. This phenomenon can be overcome by introducing new and different foods, which may lead to increased overall consumption.

The Observation That an Animal or Person Exposed to an Unchanging