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You get tired after eating because you burn calories when you eat. If you eat celery you will lose more calories than you eat from the celery. After 30 min. or an hour you will feel refueled.

Some foods that are high in carbohydrates, such as pasta or potatoes, are turned into a chemical called "glucose" when they're digested. If your body has too much glucose, it releases a chemical called "insulin" to balance it out. Insulin reacts with a protein in your brain called "tryptophan" to create a chemical called "serotonin," which is the chemical that tells your brain when you should go to sleep! All of these chemicals work with each other, but sometimes your brain gets confused and releases too much serotonin as a result - it's harmless, you might just need a nap!

Some foods are also high in tryptophan, which has the same result. Turkey and milk are common examples, which is why you may have heard that drinking a glass of milk before bed is supposed to help you get to sleep!

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Q: Why do you get tired after eating a big meal?
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