As above, hard boiled eggs. How about roast chicken thighs although you'd need to wipe your fingers. Beef jerky or even pre cooked bacon would suit me too. Snack at work could be a tin of mackerel/salmon/herring. Although many here would poopoo the idea, a hunk of cheese can be tasty.
Originally Posted by Tally
I suggest you think about primal foods you like that can be finger food. You're the one who knows you best after all.
Mind you, you specified low calorie, and we're into celery country there. I hope you get many useful replies.
Why use a sledge hammer to crack a nut when a steam roller is even more effective, and, is fun to drive.