Slide show: 10 great health foods
Spinach
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Spinach is high in vitamins A and C and folate. It's also a good source of magnesium. The plant compounds in spinach may boost your immune system. The carotenoids found in spinach — beta carotene, lutein and zeaxanthin — also are protective against age-related vision diseases, such as macular degeneration and night blindness, as well as heart disease and certain cancers.

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