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How do oxalates affect the absorption of calcium in spinach?

In every peer-reviewed research study we've seen, the ability of oxalates to lower calcium absorption definitely exists, but is relatively small, and definitely does not outweigh the ability of oxalate-containing foods to contribute calcium to the meal plan. This relationship seems particularly true in the case of spinach. So while it's true that spinach is a relatively high oxalate food, and equally true that oxalates can bind with calcium and lower its absorption, the research does not seem to support the position that spinach is a poor choice for increasing calcium in a meal plan.