Your Cool Home is supported by its readers. Please assume all links are affiliate links. If you purchase something from one of our links, we make a small commission from Amazon. Thank you!
Swiss chard does contain oxalates, and it’s actually one of the leafy greens with a notably high oxalate content.
If you’ve been wondering whether swiss chard contains oxalates and what that means for your health, you’re in the right place.
Oxalates are naturally occurring compounds found in many plant foods, and swiss chard is often singled out because its levels are higher than spinach’s in some cases.
In this post, we’ll break down exactly why swiss chard contains oxalates, how much you’re likely getting, who needs to be careful, and smart ways to reduce oxalates in swiss chard while still enjoying its nutritional perks.
Let’s dig in.
Why Swiss Chard Contains Oxalates And What That Means
Swiss chard contains oxalates because oxalates are a natural byproduct of the plant’s metabolism.
These compounds act as a defense mechanism for the plant, helping it deter pests and survive in tough soil conditions.
In human nutrition, oxalates in swiss chard can bind to calcium in your body, which means they may reduce how much calcium your body can absorb from that meal.
For most people, this is not a problem at all.
But for others, particularly those prone to kidney stones, the oxalates in swiss chard can be a real concern.
1. The Oxalate Content In Swiss Chard Is More Than Spinach
When we talk about whether swiss chard contains oxalates, the numbers really matter.
A 100-gram serving of raw swiss chard can contain anywhere from 600 to 800 milligrams of oxalates.
To put that in perspective, spinach typically has around 750 milligrams per 100 grams, though some analyses show swiss chard edging even higher.
So yes, swiss chard contains oxalates at levels that are comparable to, and sometimes greater than, the most notorious high-oxalate greens.
2. The Type Of Oxalate In Swiss Chard Matters Too
Swiss chard contains oxalates in two main forms: soluble oxalates and insoluble oxalates.
The soluble oxalates are the ones that dissolve in water and are more easily absorbed into your bloodstream.
Insoluble oxalates mostly pass through your digestive tract without being absorbed.
Because swiss chard contains oxalates that are largely soluble, this increases the risk of oxalate absorption compared to other foods with mostly insoluble forms.
That’s why the question “does swiss chard contain oxalates?” is often followed by “and should I worry?”
3. How Oxalates In Swiss Chard Affect Calcium Absorption
One of the main reasons people ask if swiss chard contains oxalates is because of calcium.
Oxalates love to bind with calcium, forming calcium oxalate crystals.
When this happens in your gut, the calcium-oxalate complex is not absorbed, so you lose that calcium from the meal.
It’s important to note that swiss chard also has its own calcium, but the oxalates in swiss chard can bind to that calcium and to calcium from other foods you eat at the same time.
If you rely heavily on swiss chard for calcium, you might not be getting as much as you think.
Who Should Limit Oxalates In Swiss Chard
Not everyone needs to worry about the fact that swiss chard contains oxalates.
But certain groups definitely should pay closer attention.
Let’s look at who is most at risk.
1. People With A History Of Kidney Stones
If you’ve ever had calcium oxalate kidney stones, knowing that swiss chard contains oxalates should change how you eat it.
Your doctor or dietitian may tell you to avoid high-oxalate foods altogether, or to limit them to very small amounts.
Swiss chard especially contains oxalates at a level that can contribute to new stone formation.
2. People With Kidney Disease Or Reduced Kidney Function
Your kidneys are responsible for filtering out excess oxalates.
If your kidneys aren’t working at full capacity, the oxalates in swiss chard can build up in your body.
This can lead to a condition called hyperoxaluria, which can further damage kidney tissue.
3. People Taking Certain Medications
Some medications, like the antibiotic tetracycline, can bind with the oxalates in swiss chard and reduce their effectiveness.
Also, if you’re on a low-oxalate diet for any medical reason, then yes, swiss chard contains oxalates that you’ll need to steer clear of.
How To Reduce Oxalates In Swiss Chard While Cooking
Here’s the good news: even though swiss chard contains oxalates, you can significantly lower them with proper cooking methods.
You don’t have to give up swiss chard completely unless your doctor says otherwise.
1. Boiling Swiss Chard Leaches Out Oxalates
Boiling is the most effective way to reduce oxalates in swiss chard.
Because oxalates are water-soluble, they leach out into the cooking water.
Studies show that boiling can remove anywhere from 30% to 50% of oxalates from leafy greens like swiss chard.
Pro tip: Don’t use the leftover cooking water in soups or sauces, as that water is now loaded with oxalates.
2. Steaming Is Less Effective But Still Helps
Steaming swiss chard still reduces oxalates, but not as much as boiling.
You might lose only around 15% to 30% of the oxalates through steaming.
If you prefer steamed greens, just know that swiss chard contains oxalates that are partly retained.
3. Pairing Swiss Chard With Calcium-Rich Foods
Even though swiss chard contains oxalates, you can eat it with calcium-rich foods like yogurt, cheese, or almonds.
The dietary calcium will bind with the oxalates in your gut before they get absorbed into your bloodstream.
This way, both the oxalates and the extra calcium are excreted through your stool instead of reaching your kidneys.
4. Fermenting Or Sautéing With Acid Reduces Impact
Sautéing swiss chard with lemon juice, vinegar, or tomatoes can also help.
The acid can break down some oxalate crystals, though the effect is not as strong as boiling.
Fermentation is another option, as the process can lower oxalate concentrations over time.
So, Does Swiss Chard Contain Oxalates And Should You Eat It?
Swiss chard does contain oxalates, and at levels that are considered high compared to many other vegetables.
That said, for a healthy person without kidney issues, eating swiss chard in moderation is perfectly safe and beneficial.
The vitamins, minerals, and antioxidants in swiss chard are fantastic for your heart, bones, and immune system.
The key is knowing your own health history and adjusting your intake accordingly.
If you have kidney stones or kidney disease, talk to your healthcare provider about whether swiss chard contains oxalates that you should avoid.
If you’re generally healthy, just remember that swiss chard contains oxalates that you can easily reduce with boiling.
So go ahead and enjoy your swiss chard, but do it smartly, and with full awareness of what’s in that beautiful leafy green.