If you consume the small germs that thrive and reproduce in rotten orange juice, they can make you sick. According to the Ohio State University NetWellness website, consuming bad expired orange juice can cause nausea, vomiting, diarrhea, and stomach irritation. The site also reports that eating food that has been exposed to sewage or garbage can spread bacteria that can cause diarrhea, urinary tract infections, and pneumonia. In addition to being an eye-appealing color, fresh-squeezed orange juice is healthy for you. It contains vitamin C, potassium, folate, and fiber. It also provides some calcium, but not enough to be considered beneficial. Orange juice is a good source of antioxidant enzymes that protect cells from damage caused by free radicals. These enzymes are lost during processing and can not be recovered. The American Cancer Society recommends that you drink at least four cups of fruit or vegetable juice daily. This should include one cup of freshly squeezed orange juice. However, if you are already getting enough vitamin C from other sources, such as vegetables, then drinking more juice is not going to benefit you health-wise. Of course, if you have symptoms related to consuming bad juice, then it's best to stop drinking it and seek medical help.