Quick Answer. HowStuffWorks explains that food poisoning often occurs when a person eats spoiled food. Common symptoms of food poisoning are stomach pain, diarrhea, nausea, vomiting and cramping.
Confusion continues over coolant colors for cars. Of course, there is still the good old green stuff, but there is also orange, yellow (gold and amber), red, pink, blue and, if you mix the wrong things together, brown. Despite the rainbow of colors, all antifreeze starts out colorless.
Now on to the radiator. Check the color of the coolant. If it's green, it's in good shape. If you see some discoloration in it by all means have the cooling system flushed and refilled with new coolant. I check the coolant overflow tank on my vehicles for discoloration and use it for a guide as when to flush my system.