If a consumer increases their consumption of apples and experiences a decrease in their marginal utility from apples, what is the most likely underlying cause of this effect?

When a consumer eats more apples, each additional apple they consume gives them less satisfaction, which is known as diminishing marginal utility. This happens because, after eating a few apples, they start to feel full or lose interest in the taste of apples. For example, if someone eats one apple and enjoys it a lot, the second apple may still be good, but it won't be as exciting as the first. As they continue to eat more, the pleasure they get from each new apple decreases. This pattern shows how our enjoyment can change based on how much of something we have already consumed.