I do think the "survive weeks without food" is funny.
Survive sure.
Live and function?
After 2 days without food I was pretty damn dizzy. Last thing I would want is to be alone, in the dark and cold trying to get off a mountain. No thanks. Albeit, there most likely would be something you could munch on. For whatever reason, it may not be convenient to do so.
It's good to have back-up, Mine is a bag of rice with some spices and beef bullion, and a small container of peanut butter. Something hot, something high in cal and quick. It's easy, cheap and small to pack.