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OBJECTIVES: We investigated the amount and sources of vitamin D in the Japanese diet by analyzing diet records collected over a 4-mo period.METHODS: Dietary data for this study were provided by a nursing home in Niigata, Japan. Diet records, written by the nursing home's dietitian, for 122 consecutive days between September and December 1999, were used. The amount of food for an individual was weighed...
Low energy intake, low calcium intake, low plasma 25-hydroxy-vitamin D or low calcitriol levels, and high salt intake might support the development of space osteoporosis. Therefore, my colleagues and I monitored the daily energy and calcium intakes in eight astronauts during their respective space missions (Spacelab D2, Euromir 94, Euromir 95). In most of these astronauts, energy intake was reduced...
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