When all we had to eat were the soft shoots from stalks of grass we collected, we ate them. When hungry in survival mode, eat whatever you can, no matter the quantity. There are damned few people in this world that are proficient enough at foraging that they can collect enough protein or any other foodstuff that would hit the limits of what they should consume. Putting anything edible in that big cavern that was my empty stomach was better than abstaining. Besides, watching someone else eat something when you are ravenous makes it impossible to control. I wouldn't worry one whit about transitioning from carbs to proteins to nothing, not in a survival mode. You eat what you can find, and be damned glad you have something to give the beast in your belly.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)