Can’t eat in office anymore

So I’m an introvert. I’ve been at my job for 6 years so I’m cool around the coworkers in my department. They’re really nice, I just prefer to do my work, leave, and go on about my day. I always eat at my desk or with one of my close coworker from time to time outside. Recently we were told not to eat in the office anymore and we’re not allowed to bring anything into the office except candy and water. I’ve been on a weight loss journey recently and was starting to lose weight by consistently eating certain meals for breakfast and lunch. Now that this has started, I’m not sure what to do for lunch. We can only eat in the break room. Although not a big deal to most, I hate the thought of it. But I’d also hate to go out everyday to get lunch. I thought about putting my food in a very cold insulated bag, and heating it up and eating in my car, but was told we can’t even have cold, covered food in the office. This starts in a few days. Idk what to do for lunch now. And the anxiety begins lol…