Characters
Why do you eat that stuff? There's no food in your food.
— Constance · Say Anything...
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
Constance distinguishes something being eaten from something she considers properly deserving the name food. Repeating the word in opposing senses makes that judgment sound paradoxical. The question challenges the choice, while the second sentence supplies a blunt explanation for why she finds it questionable.
Context reviewed