For example, consider water and protein shake – both are liquids of similar viscosity and sensation. How does my stomach feel fuller when I drink the shake?
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I answered this, then realized that I had misread the question.
Food, such as the protein shake, contains fat, carbs, and protein. These require digestion or they would just pass through the body. Your body detects that these are present and starts the digestion process, making the food able to be absorbed and its calories and nutrients utilized.
Water doesn’t trigger any of these reactions. Your body just absorbs it as it passes through the intestines. It doesn’t need to do anything special as the water requires no digestion beyond this. It has no nutrients that require breaking down, no fat, no carbs, and no protein.
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