October 14

What Are Oxalates And Should You Be Avoiding Them?

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Oxalates are compounds that naturally occur in a variety of foods, including very healthy foods like berries, leafy greens, and beans. Like lectins, oxalates are present in plants to help protect them from insects and disease. When it comes to humans, they are considered anti-nutrients because when they are eaten, they can interfere with the absorption of other important vitamins and minerals, including iron, which is one of the most common nutrient deficiencies, and calcium, which is critical for strong bones. 

Oxalate’s antinutrient qualities can create issues that go beyond just nutrient deficiencies too. When oxalates bind to calcium, they can form calcium oxalate crystals. These crystals prevent calcium from being absorbed and utilized and can contribute to diseases such as osteomalacia and rickets. They can also travel through the body, causing muscle pain. And if they make it to the kidney they can cause kidney stones. That’s why, if you Google oxalates, the first search results have to do with low-oxalates diets to prevent kidney stones. 

For most people, oxalates in food aren’t a big deal and we simply excrete them through waste. That said, for those who are sensitive to oxalates, high-oxalate foods can cause abdominal pain, nausea, muscle weakness, and burning and tingling in the mouth and throat. If you are prone to kidney stones or oxalate issues, you may also want to try and avoid high-oxalate foods. Some common high-oxalate foods include: 

  • Beans
  • Beets
  • Berries
  • Black pepper 
  • Broccoli
  • Cauliflower
  • Chocolate
  • Chard
  • Oranges
  • Kale
  • Nuts
  • Spinach
  • Radishes
  • Rhubarb 
  • Tofu

These are the foods highest in oxalates but the truth is, oxalates are present to some degree in basically every healthy plant food, which means they are impossible to avoid entirely. And you wouldn’t want to, either! If you gave up all oxalate-rich foods, you’d be giving up all the best high-fiber, phytonutrient-rich foods in the world. The good news is that many of these foods, which are high in oxalates, are also high in calcium, which means even if the oxalates do block some of the calcium, you are still getting some calcium with them. Two in particular that you can increase your intake of are kale and broccoli, which at 41% have a better calcium absorption rate than traditional milk (32%). (1) 

The other good news is that by cooking your food in a certain way, you can reduce the oxalate content and eliminate the negative effects of oxalates. 

There are quite a few different methods for reducing oxalates in foods. The first one applies to most oxalate-rich foods, including leafy greens and cruciferous vegetables, and that is simply to cook them. You can do this by sautéing them, steaming them, baking them, or slow cooking them. Heat helps break down oxalates and makes them less irritating to your digestive system and less likely to act as antinutrients. 

For nuts, beans, and seeds, soaking is the best method to remove oxalates. You can sometimes buy these foods pre-soaked from the store, but soak them in water for 12 hours, drain them, then roast them yourself at a low-to-medium temperature for 10 to 20 minutes (or dehydrate them, if you have a food dehydrator).

Oxalates are compounds that we should all be aware of, especially if we have kidney stones in our family or in our health history, but they’re nothing to panic about, either. For most of us, we can simply make an effort to eat high-oxalate foods cooked.

If you want to learn more about your own health case please check out our free health evaluation. We offer in person as well as phone and webcam consultations for people across the country and around the world.

You might also like . . .  All About The Blood Type Diet: A Functional Medicine Perspective

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