And in case you were wondering, spinach is the winner in the superfood faceoff with kale.
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Kmareka.com 
Spinach is great,but if you have kidney problems,the lower potassium level in kale is probably healthier-same if you are on high dose ACE inhibitors-i almost rolled a 7 from ACE inhibitor induced hyperkalemia-nowadays I take another med and can have spinach
The iron in spinach is actually less bioavailable because of spinach’s high oxalic acid content. One of the best sources of iron is blackstrap molasses.