I'm a nail biter, and have been for around 15 years now, and I like caffeine, which makes the problem worse since I do it as a "fidget", instead of as a direct result of stress.
I've been coding for a few hours today, and have already worn down my nails from when I need to stop and think about what I'm writing.
I tried chewing gum, which helped a lot, but most gum contains artificial sweeteners which upset my gut. My teeth also aren't perfect, so I'd like to avoid chewing sugared-gum.
I tried seeds, which also worked since they kind of act like gum, but if I'm home coding all day, downing a bag of seeds constantly is also pretty hard on my gut, and gets somewhat expensive.
Obviously, the simple answer would be "just focus on not chewing your nails", but like I said, I've been doing this for quite awhile now, so it's automatic. I'd rather spend my mental resources on the problem I'm trying to solve.
How can I help prevent myself from chewing my nails while thinking?
(Sorry, I don't use lifehacks that often. I really don't know how to tag this).