You got the sniffles or upset belly, don't reach for a glass of orange juice or that fizzy stuff. That is good, but try pineapple juice instead. It has vitamin C like its orange cousin, but it also has bromelain. Studies have found it is effective in treating upper respiratory conditions and acute sinusitis. The next time you get a cold, make this recipe!contain little or no fat or cholesterol, and provide significant amounts of fiber, digestive enzymes, vitamin C, calcium, and potassium.