For me, it is neither.
The best depiction of how I feel is from a show in the US called "Naked and Afraid". Two people are dropped in extreme environments, such as the Amazon, without food, water, or clothing. They have 21 days to survive until they are rescued.
After several days without food, water, or shelter, all the while working hard to try to obtain these things, their bodies literally shut down. Many of them are left lying on the ground, unable to perform the simplest of tasks or converse coherently. When they try to walk, they are shaky, uncoordinated, and collapse easily. They complain of severe headaches and confusion. Once fed or hydrated, they spring back to life quickly.
The first time I saw that show, it was an "Aha" moment. My body seems incapable of processing food into energy or water into hydration.