Kaempferol: This antioxidant is associated with a decreased risk of cancer and chronic disease ( 5 ). Nitrates: Spinach contains high levels of nitrates, which can promote heart health ( 6 , 7 ). Quercetin: This antioxidant can fend off infection and inflammation. Spinach is one of the richest sources of quercetin food ( 8 , 9 , 10 ).

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