Since we are using "just in time" food to manage blood glucose, some people are worried that they can't pull this off at work. Nonsense.
When we eat five times per day, we are taking advantage of the fact that the body uses calories each time it digests food. So, the more often we eat (up to your target amounts for fat, protein, and carbs) the more our metabolism revs up.
The simple answer is to take your midmorning and midafternoon breaks to eat a balanced protein and carb snack. For me, that is a protein bar. And even if you don't take breaks at work, most people usually have time to eat a protein bar on the run.
But don't get stuck in the protein bar rut. You can have any protein source with any carb source, as long as the protein and carbs are equal. That could be a piece of chicken and an apple, a piece of ham and a peach, and so on. Use your imagination!
If you are eating a lot of protein bars, though, you are most likely not getting your 5 servings of fruit and veggies daily. So, at least half the time, use real food for your breaks, including fruit and veggies. But remember, you need protein to go along with any carbs to balance blood sugar.