The deficiency of iron by exercise relates to the decrease of iron absorption, deficiency of iron intake, increase of iron lose, hemolysis, and stress of the body.

运动导致缺铁的原因可能在于吸收下降、摄入不足、丢失增加、溶血以及机体应激等方面。

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Osteoporosis is closely related to deficiency, excess or imbalance of some minerals in dietary intake.

骨质疏松与某些矿物质的饮食摄取不足、过量或不平衡有关。

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The main pathological factor is zinc deficiency, which may result from insufficient intake, disfunction in absorption or overdue discharge(of the element)from the body.

锌摄入不足、吸收不良或排泄过多、需要量增加是主要病因。

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Living in a zero-gravity environment poses risk of nutrient deficiency and bone loss, so keeping close tabs on food intake in space is crucial.

FORBES: NASA Asks The 'Crowd' To Help Track What Astronauts Eat