Correlation: The more chocolates that people consumed, the better they performed on the intelligence tests and the fewer chocolates that people consumed, the worse they performed on the intelligence tests.

What could be an alternative explanation for this correlation?
I am finding it hard to think of them :(

alternative to which explanation?

Alternative like the correlation is that the more chocolates that people consume, the better they perform on an intelligence test. Could there be another explanation for the correlation? Could there be something else that explains that relationship? Does that make sense?