Feeding astronauts requires science, engineering, and a deft hand with spices. The difficulties 
of eating in micro gravity include problems of stray crumbs or drops of fluid floating around and lodging in equipment. That means, for instance, that salt and pepper have to be in liquid form. Physiological changes in low gravity include constantly blocked sinuses, which adversely affect human senses of taste and smell. The problems of cooking in very small spaces, with limited access to water, or refrigeration, or even power, and of disposing of packaging materials are also substantial. In space, everyone cleans their plates.
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