During World War II, when combat rations were tinned, meat hashes were a common entrée because they worked well with the filling machines. “But the men wanted something they could chew, something into which they could ‘sink their teeth, ’” wrote food scientist Samuel Lepkovsky in a 1964 paper making the case against a liquid diet for the Gemini astronauts. He summed up the soldiers’ take on potted meat: “We could undoubtedly survive on these rations a lot longer than we’d care to live.” (NASA went ahead and tested an all-milkshake meal plan on groups of college students living in a simulated space capsule at Wright-Patterson Air Force Base in 1964. A significant portion of it ended up beneath the floorboards.). Mary Roach
About This Quote

When you are confined inside an area like a space shuttle or the Gemini capsule it is important to have something that you can chew on or something that can be chewed on. You will need to eat daily if you don't want to get eathly. So, people who are confined in space like astronauts can choose to eat food like potted meat because it is easy to chew and doesn't require any tools.

Source: Gulp: Adventures On The Alimentary Canal

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