A new study reported by Psychology Today says that going HAM on that pizza last night might make you feel like crap the next morning but it can do way more than that. It can change your mood which you might expect, feeling like crap makes you more grumpy. Studies have also shown it has a big effect on a person’s productivity and as a result of feeling badly people tended to avoid doing tasks or socializing with co-workers which over time made them less pleasant to be around at work in general. Not to mention higher reports of headaches, stomach aches, diarrhea. So, if you have an important day at work tomorrow maybe grab a few vegetables instead of 12 cheese steaks just to be safe.