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A healthy diet with proper nutrition is essential for maintaining good overall health.(1)it was discovered earlier in this century, people have routinely (2)taking supplements for this purpose. The Recommended Dietary Allowance (RDA) is a used nutritional (3) for maintaining optimal health. The RDA specifies the recommended (4)of a number of nutrients for people (5)many different age and sex groups. The National Research Council’s Committee on Diet and Health(6)proposed a definition of the RDA to be that amount of a nutrient (7)meets the needs of 98 percent of the population. The RDA approach has a number of shortcomings. First, it is (8) on the assumption that (9)is possible to accurately define nutritional requirements for a given group. (10)，individual nutritional(11)can vary widely within each group. The efficiency with which a person converts food intake (12)nutrients can also vary widely. Certain foods when eaten in combination actually (13)the absorption of nutrients. For example, spinach combined with milk reduces the amount of calcium available to the body(14) the milk. Also, the RDA approach specifies a different dietary requirement for each age and (15).
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试题答案：
(1)since
(2)been
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