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Hunger Causes Lethargy

 Hunger Causes Lethargy
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Hunger Causes Lethargy
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Being hungry is no fun. You're salivating all the time (perhaps excessively), you can't concentrate, and you may also become "hangry" and start lashing out at people and things. And if you're a fictional character, it's worse, because you might become tired or even fall asleep.note It doesn't help that both calories and stamina from a good night's sleep get referred to as "energy".
This is the trope for when a character is hungry, and it makes them lethargic. While it is true that malnutrition can cause lethargy, as can being hungry when you have a problem such as hypoglycemia (and going without food for a few days can have the same effect because it'd lower your blood sugar), in these cases the character has no medical problems, it hasn't been long enough to lower the blood sugar significantly, and it obviously isn't malnutrition, yet they become weak or sleepy anyway.
A common usage of this trope is in stories, particularly those aimed at children, that aim to teach a lesson about not skipping a meal. After all, they want the kiddies to pay attention and no kid wants to be tired. Also, concepts such as nutrition and being able to pay attention may be hard for kids to understand, but all kids know what it means to be tired. In extreme cases, this may be an example of Scare 'Em Straight.
Another common place it's seen is in video games, where being hungry might make your character seem groggy and/or move more slowly. This, which is similar to the Hyperactive Metabolism, is often put in to make a game more challenging, especially if the player character doesn't actually need sleep.
In works other than kids' stories and video games, expect any character who Forgets to Eat to appear groggy or even fall asleep at their desk (see Asleep in Class if this happens at school). This usually prompts another character to ask, "How long has it been since your last meal?", "Did you eat breakfast?" or similar.
As a side note, the "falling asleep" part is a bit inaccurate, since sometimes people can even have trouble falling asleep when they're hungry.Why? Because when we're hungry, our body produces a hormone called ghrelin, which is designed to keep you alert so you can find food.
Contrast Food Coma, where eating too much makes you lethargic. If seen in food ads, the food will often not only get rid of the fatigue but give Cereal-Induced Superpowers. Can lead to Worf Had the Flu if they were defeated by someone who wouldn't have been able to otherwise. If portrayed as a moral, it might lead to Can't Get Away with Nuthin' and, if played unrealistically, it's a Space Whale Aesop. Sometimes, if played as an Aesop, never eating breakfast (it's always breakfast, due to the piece of "conventional wisdom" that cites it as most important) could be the reason behind a Sleepyhead or a weakling. Can involve Tempting Fate if they previously think they didn't need to eat right then. Note that this does not include Fainting, as that's different from normal falling asleep. In video games, it could cause sleepy-looking Idle Animations, which could be part of an Expressive Health Bar. Due to the tropes Appetite Equals Health and Dangerous Drowsiness, if this trope is subverted, it's often a very bad sign.
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 Hunger Causes Lethargy
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Artistic License – Biology
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