When you’re sick, why does your appetite often go away?

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I’ve noticed that with certain sicknesses, I tend to go most of the day without eating anything; if not all day. Usually just for one day though, then I get my appetite back. Normally (when I’m not sick) if I go a few hours without eating I get “hangry”. I’m used to eating quite a lot throughout the day though because I have a fast metabolism. So (for me it happens with tonsillitis or stomach bugs) why is it that when you’re sick you don’t feel inclined to eat? Doesn’t your body need food for energy to fight the sickness? And why does it seem that only certain sicknesses suppress the appetite?

In: Biology

7 Answers

Anonymous 0 Comments

You gastrointestinal systems use a lot of energy. If you have an infection, the immune system demands that energy instead.

> I’m used to eating quite a lot throughout the day though because I have a fast metabolism.

Your metabolic rate is not a static value. Its a rate at which you metabolize energy, sleeping and its lower, running up stairs, higher. And the background rate of burn does not vary by more than 300kal at the extreme between people(half a meal).

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