Not HR but my company is too small to have one, so it just falls on me. Used to have an A/R clerk who would snack at her desk all day long. We are a pretty casual, laid back company so it's not a big deal as long as she was getting her work done. But, then it escalated to having food constantly being delivered; tacos in the morning, pizza at lunch, Chinese in the afternoon. It was bizarre, and made it difficult for her to work when she's eating full meals all day. I was on the fence about saying something until she brought in an Instant Pot. She plugged it in and cooked a freaking pork roast at her desk, poured in BBQ sauce she brought and ate on it all day. I was dumbfounded, it was so strange. I pulled her aside the next day and told her how unprofessional it was. She was shocked and told me I was being unfair because I never specifically said no one was allowed to bring in an Instant Pot. She truly seemed genuinely surprised that she wasn't allowed to do that. She scaled it down after that, but I sometimes wonder how much further she would have gone if I never said anything.