Originally Posted by pangolina

This is reminiscent of the "don't eat fat and carbohydrates together" rule, which can be also be confusing at first reading. It's intended as a general principle about how we should provide fuel for our bodies, and he's already put it into effect when he created the diet. If we're following ON, then our fat:carbohydrate ratio is high enough that our bodies won't see it as mixing the two.