This may be a far-reaching example, but think about last Tribal Council when everybody lost their minds.
So as Julie is causing chaos at one end of tribal, Julia is using her brain to look at options for how to stay clear of the madness and avoid being voted out.
Part of that was due to the inability to think clearly due to lack of food.
Imagine that Julia, who was completely depleted at that point, had just spent the afternoon devouring pizza.