> Edit 1: With that why do we feel so weak and tired when sick/have a fever
To answer this since people already answered the main part of the question. When your body is sick, it’s trying to kill off an invasion of foreign bodies that are very much determined to live even at your expanse. This process consumes a large part of your energy, thus leaving less energy for the rest of your bodily functions, thus making you tired.
Ofc that’s not the only parameter at play but as far as I’m aware it’s the main one 🙂
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