Reactive hypoglycaemia. Basically, with some people, when they eat, their body produces a little more insulin than they actually need. So they get low blood sugar. Not low blood sugar like a T1 diabetic can get, but enough to make you super hangry and irritable.
The way to deal with it is to eat several small meals a day instead of just three. Breakfast, snack, lunch, snack, dinner, snack. A snack like apple slices with peanut butter or the like. Carbs/fat/protein mix.
When you are hungry, your blood sugar is low. This is because your body is prioritising its resources to the parts of your body that can best survive a famine, namely your brain and your heart.
When your blood sugar is low, your hunger hormones (Ghrelin and Leptin) increase, but your satiety hormones (Peptide YY and Cortisol) decrease. This makes you feel hungry.
When you are hungry, and you smell food, your hunger hormones increase, and your satiety hormones decrease. This makes you feel even hungrier.
On top of that, your blood sugar is low, so your mood is lowered, and your body can’t make good decisions, so you become angry.
According to this [page](https://health.clevelandclinic.org/is-being-hangry-really-a-thing-or-just-an-excuse/), it is because of the cascade of release of stress hormones, such as cortisol and adrenaline, by the state of low blood sugar levels, caused by the ´´lack of food in the body´´ (hunger is basically your brain perceiving through hormone and other signals that the body needs food , nutrition). And as everyone should know, cortisol is the famous stress hormone, so it can cause more aggressive and stressed behavior, especially in a hungry situation.
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