FOOD POISONING OR STOMACH BUG? Dear Heloise: So many people can’t tell the difference between food poisoning and a stomach bug. It’s important to be able to know the difference: Food poisoning: You experience diarrhea, cramps, nausea, vomiting and possibly a low-grade fever. It’s usually brought on by contaminated food, food that wasn’t kept at a proper temperature, or bacteria on a food handler’s hands. It can also be caused by a number of toxins. It’s not contagious, and over 48 million Americans report a case of food poisoning each year.Stomach bug (or flu): You experience diarrhea, nausea,…