Why does blood sugar spike after a meal if food is digested in the stomach for several hours before it starts getting absorbed in the small intestine?
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For the same reason medications can be used in sublingual or per rectum. These ends of the digestive tract do have absorption. So does the stomach. This is why foods can be classified by glycemic index – it’s basically a measurement of how much simple sugars and easily digestable sugars a food have and thus how fast it will spike blood sugar.
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