What I find is most helpful to me is packing snacks to take with me to work. I always make sure I have at least a decent-sized piece of speed fruit and a low-syn snack with me.
Something that helps is finding a snack that TASTES naughty but is low-syn, like the Ryvita ferrero rocher (only take 2-3 into work with you). You could make yourself up a chocolate mousse using quark and choc shot/options (I think there's a recipe on the SW website).
Or even make some syn-free hummus (I have a recipe if you want) and take it in with some carrot sticks. I've always found that if I'm eating something that SHOULD be bad for me but is low-syn, it does the trick--particularly sweet things, as it satisfies the craving.
Of course, today, I've had my orange AND a very small sliver of the millionaire's cheesecake that some idiot brought in, but 9 times out of 10, it works.