Use the following to answer question: 
-(Table: The Utility of Macaroni and Cheese) Use Table: The Utility of Macaroni and Cheese.Carmen loves eating macaroni and cheese on Thanksgiving.Carmen's marginal utility from eating macaroni becomes negative at the _____ serving.
Definitions:
Blonde-Haired
Characterized by having light or "blonde" colored hair, a genetic trait that varies widely across different populations.
Fair-Skinned
Having a lighter shade of skin which is more susceptible to damage from ultraviolet radiation compared to darker skin tones.
Atopic Dermatitis
A common chronic skin condition characterized by itchy, inflamed skin, also known as eczema.
Pruritus
The sensation of itchiness that prompts a person to scratch.
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