Are you on MDI or mixed insulin?
(MDI is where you have 2 insulin types having one before bed/in the morning (long acting), and then the other with each meal(rapid acting)
If the former, then skipping the occasional meal should not cause too many problems, just be sure to check your blood to be on the safe side. If you're on Mixed insulin however, then you will definitely need to eat, as you will have too much rapid acting insulin in your system so your BG will not remain stable.
Hope this helps