Most of us are fortunate enough to not just eat/drink for survival, but also for enjoyment. We taste food and beverages the moment they enter our mouths, and we can taste/chew/feel texture/etc.. but still we dont quite feel satisfied until we actually swallow.
For example: no matter how much you enjoy your favorite drink, you cant just take one sip and keep it in your mouth forever.
In: Biology
Much of our sensory apparatus is tuned to care about changes and new stimuli. This is why things like white noise can be tuned out, or persistent smells can be eventually not be noticed, or the pressure on your body from where you’re sitting or lying comfortably isn’t constantly in the front of your mind. Even our sight does this. Our eyes make lots of constant small movements called saccades. If you force yourself to hold your gaze steady on a single point with a static scene, you’ll find your vision loses definition and color, and it can actually start to hurt.
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