Does spinach prevent calcium absorption?

Q:  Leafy greens can be a great source of calcium, but I've heard that spinach has something in it that actually works AGAINST calcium absorption.  What is that?
A:  Spinach does have oxalic acid in it, which binds with the calcium in spinach. 
Q:  Then should I avoid eating spinach?
A:  No, because spinach does not prevent absorption of calcium from other foods and  has other minerals and vitamins that aid calcium absorption, such as magnesium,  potassium and vitamin K.  So go ahead and toss a handful of spinach into your yogurt smoothie, and you will reap nutritional benefits from the spinach  and still absorb the calcium from the yogurt.

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Here are some related articles:

 On vegetables with oxalic acid

The bioavailability of calcium

What's healthy about spinach

Food and your bones

What are your favorite ways of getting spinach and other dark, leafy greens into your diet?  Comments welcome!