Eli5: Why do we still feel hungry even if we’ve had enough calories for the day?

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For example, if I was to drink my daily calorie intake in like smoothies or coffee, why does my stomach still rumble with hunger and feel empty?

What’s the difference between feeling full and calorie requirements?

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4 Answers

Anonymous 0 Comments

Your hunger-signal is not based on the calorie density of the food in your stomach. We have changed our diet to foodsources with a lot of calories that are taken up more easily. That means to fill our stomach we need more of the food for us to feel full. We then take up the calories but they might not be needed because all of them enter our system at the same time. The excess of nutrients are stored for worse times. Then when we get hungry again because we are low in energy our instinct isn’t to use those reserves if there are foodsources available, they are stored in case there aren’t any sources available.

Burning fuel in your body happens all day at different rates and you cannot really easily anticipate when you’ll need more or less. This is why we have a built in mechanism to always make sure there is enough energy to go around in order to prevent certain organs that use a lot (like the brain) from getting too little

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