 Finally, foods require a minimum of energy expenditure throughout their use; they must store well, open easily, and leave little waste behind.Carbonated drinks have been tried in space, but are not favored due to changes in belching caused by microgravity; without gravity to separate the liquid and gas in the stomach, burping results in a kind of vomiting called "wet burping".Coca-Cola and Pepsi were first carried on STS-51-F in 1985.