I actually got in trouble in one of my jobs for not telling anyone. I was scared they'd make too much of a big deal about it. Now I make sure at least the boss knows, but I never let it interfere with my work. I work in an office setting though, so it makes it easier. I can check my sugars during a bathroom break, and eat my snack while I'm at my desk. They type of insulin I use is also more forgiving with what time I take my lunch, so it doesn't matter if I have lunch at 12 or 1.