I used to snack on salted unshelled sunflower seeds. The process of sucking the salt off the shell, breaking the shell open in my mouth, separating the two, spitting out the shell and swallowing the sunflower seed was just the right level of physical distraction to block out most other external stimuli while not breaking my coding concentration. These days I don't snack but if I did, I'd probably go back to sunflower seeds. The pile of chewed up shells is a bit unsightly, even if you have a paper towel to sit them on before dumping them into the trash, so that's something to keep in mind if you share your workspace with others.
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I used to snack on salted unshelled sunflower seeds. The process of sucking the salt off the shell, breaking the shell open in my mouth, separating the two, spitting out the shell and swallowing the sunflower seed was just the right level of physical distraction to block out most other external stimuli while not breaking my coding concentration. These days I don't snack but if I did, I'd probably go back to sunflower seeds. The pile of chewed up shells is a bit unsightly, even if you have a paper towel to sit them on before dumping them into the trash, so that's something to keep in mind if you share your workspace with others.