to obtain the nutrition you need,

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答案:vary
vary the foods you eat为祈使句,因此用动词原形.
vary vt.使不同,使多样化
To obtain the nutrition you need,vary the foods you eat.为了获取需要的营养,你吃的食物要多样化.
======以下答案可供参考======
供参考答案1:
to vary