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The potassium deficiency issues on the Apollo missions were at least to some degree due to exertion during the lunar EVAs. Despite the low gravity, the stiffness of pressurized spacesuits made what would otherwise be moderate activity more strenuous; the astronauts sweated off several pounds each according to Biomedical Results of Apollo: All Apollo ...


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In theory cosmic rays are more than capable of producing harmful by-products after colliding with food. They are high energy and on impact can cause all sorts of exotic (and unhealthy) of of matter. These are called "cosmogenic nuclides" https://en.wikipedia.org/wiki/Cosmogenic_nuclide and include some pretty nasty things. However its worth noting cosmic ...


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