We've all been there ---> trying to maintain a diet whilst working in corporate 9-to-5 environment; surrounded by a combination of unhappy, miserably-married, smelly, petty and gasbagging co-workers.
You need to keep your eye on the prize here........DO NOT succumb to their fat-like peer pressure.
Here's a simple step plan :
1. Pack your lunch for the day
2. 20 min prior to said pizza get-together, discreetly take lunch out of bag and slip outside....EAT!
3. Dispose of lunch box/plastic container, napkin, tuna can, etc into industrial bin...pour kerosene on it and light it up.
This fire will serve to catch the attention of your co-workers, who in turn will run outside to oogle over the biggest moment to happen in their mundane and souless lives in a very long time....said Pizza get-together is now dead and buried.
Just don't burn the building down.
Aren't you the same guy who suggested a similar thing to Titus?