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Let the detailed answer with links to serious research be left here by specialists in the relevant fields. I'll tell you about my individual experience.�
Light hunger really significantly improves the reaction time and increases the speed of decision-making. But there are costs – the level of aggression increases (within the normal range). But the degree of exhaustion, when the head splits from lack of food and general weakness occurs, does not carry anything productive in itself. And I will specifically describe what a slight degree of hunger means-a missed lunch (if we talk about three meals a day). And a palpable hunger is 1-2 days without food.
After eating, if in a simple way, the blood rushes to the stomach, thereby washing the brain less, and therefore slightly stupefies. After a full meal, according to Archimedes ' law, you should sleep.