I work at home, so I do not have a "standard" work day where you get in car or transit to go to work. But one thing I am a proponent of is taking an actual lunch.
This means either going out somewhere to grab a bite once in a while with my wife or friends, or walking away from the desk sitting down at the table and watching a show for 30 minutes while I'm eating something prepared or picked up.
It's important to have a proper meal of course, but also take that time away in the middle 'ish of your day to break it up.
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