Your body’s main source of energy is carbohydrates (AKA sugar). Your brain runs on sugar and cannot survive long without sugar. Low blood sugar (hypoglycaemia) can lead to coma or death if not treated quickly because your brain needs a constant level of sugar. Calorie dense food yields to more energy through cellular respiration (a reaction where your food gets broken down to energy). Therefore, your brain will send you cues such as cravings to eat a certain thing that is usually calorie dense (usually high in carbs). More calories > more energy. Some extra energy such as sugar gets stored in the liver for future use. It’s an evolutionary survival mechanism.
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