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Hunger
You probably know malnutrition can be physically harmful, but even skipping a meal can have nasty effects on your mental acuity. Painful rumblings in your stomach are distracting, low blood sugar leads directly to fatigue, and a lack of nutrients will slow down brain function. All of this works against your concentration.
You can ward off hunger by eating something every few hours, but choose your menu carefully: poor or incomplete nutrition can be almost as bad for brain power as no food at all. Protein is crucial to produce important brain chemicals, while iron and vitamins B and D will bolster your cognitive function.
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