Every March, the National Kidney Foundation asks America to pay attention to kidney health for 31 days. For the 1 in 10 Americans who've passed a kidney stone, that awareness lasts a lot longer than a month.
I know, because I'm one of them.
Two Stones, Two Surgeries, One Breaking Point
My first kidney stone sent me to the ER at 2 AM. What followed was an operation, a stent for two weeks, and a removal procedure I wouldn't wish on anyone. I thought it was a freak accident.
Three years later, it happened again. The second time was worse — five nurses, nitrous oxide, and me literally kicking and screaming during the stent removal. The PTSD that followed was real. I was afraid to eat.
When I finally saw a dietitian, she had to Google the word "oxalates."
That was the moment I decided to build OxalateGuard.
The Gap Nobody Talks About
Here's what National Kidney Month campaigns usually cover:
- Drink more water (true, but not enough)
- Get your kidneys checked (important for CKD)
- Reduce sodium (helpful, yes)
Here's what they rarely mention:
- 80% of kidney stones are calcium oxalate stones — and most people have never heard the word "oxalate"
- Oxalates hide in "healthy" foods like spinach, turmeric, sweet potatoes, almonds, and dark chocolate
- Your doctor probably won't bring it up unless you specifically ask about dietary oxalate
- 50% of stone formers will have another stone within 5-7 years without dietary changes
That gap — between "drink water" and actually understanding what's in your food — is why so many people end up back in the ER.
What I Wish I'd Known
After my second stone, I restricted my diet to chicken, rice, and lettuce out of pure fear. Then I started adding turmeric and cumin to make things taste less miserable, thinking they were healthy.
They're both high in oxalates. I passed another small stone.
Nobody told me:
- Turmeric contains 2,860 mg of oxalate per 100g — that's one of the highest-oxalate spices on the planet
- Cumin clocks in at 1,240 mg per 100g
- Spinach (1,750 mg/100g) has more oxalate than almost any food, despite being marketed as a superfood
- A "healthy smoothie" with spinach, almond butter, and dark chocolate could blow past a full day's oxalate budget in one glass
The information exists in academic papers and scattered spreadsheets, but it's practically inaccessible to the average patient standing in a grocery aisle trying to figure out what's safe.
What You Can Actually Do This Month
National Kidney Month isn't just about awareness ribbons. If you're a stone former — or you love someone who is — here are concrete steps that actually help:
1. Learn Your Numbers
Start tracking your oxalate intake, even roughly. Most nephrologists recommend staying under 40-50 mg of oxalate per day for recurrent stone formers, though individual limits vary. You can't manage what you don't measure.
2. Pair Calcium With Oxalate
This is counterintuitive, but calcium taken with meals actually binds to oxalate in your gut, preventing absorption. It's not about avoiding calcium — it's about timing it right.
Take calcium supplements (or eat calcium-rich foods) with your meals, not between them. This is one of the most evidence-backed prevention strategies we have.
3. Don't Fear Food — Fear Ignorance
A low-oxalate diet isn't restrictive. There are hundreds of low-oxalate foods. The problem is most people don't know which ones are safe and which ones are hiding danger.
- Safe: chicken, eggs, white rice, cauliflower, cabbage, apples, blueberries, butter, cheese
- Risky: spinach, beets, rhubarb, almonds, chocolate, sweet potatoes, Swiss chard, star fruit
The full picture is more nuanced than a two-line list — which is exactly why we built a database of 2,500+ foods with oxalate measurements sourced from peer-reviewed research.
4. Watch the "Health Halo" Foods
Some of the biggest oxalate offenders are marketed as superfoods:
| Food | Oxalate (mg/100g) | The "health" claim |
|---|---|---|
| Spinach | ~1,750 | "Nutrient-dense green" |
| Turmeric | ~2,860 | "Anti-inflammatory" |
| Dark chocolate (70%+) | ~300-500 | "Heart-healthy antioxidants" |
| Almonds | ~469 | "Healthy fats" |
| Sweet potatoes | ~240 | "Complex carbs" |
These aren't bad foods — but if you're a recurrent stone former eating them daily without knowing, you're playing with fire.
5. Tell Someone
Half the battle is knowing you're not alone. If you've had a kidney stone, tell someone this month. Share what you've learned. You might save them from their own 2 AM ER visit.
A Gift for Kidney Month
Because March is National Kidney Month, we're offering a free month of OxalateGuard Premium to anyone who wants to take control of their diet.
Use code KIDNEYMONTH at checkout — no credit card tricks, no gotchas. The code is valid through March 31, 2026.
Premium includes:
- Unlimited barcode scanning — check any packaged food instantly
- Recipe converter — paste any recipe URL and get an oxalate breakdown
- Menu check — snap a restaurant menu and know what's safe
- AI diet coaching — personalized insights based on your food log
- 2,500+ food database with cooking method reductions
The Bigger Picture
37 million Americans have chronic kidney disease. Kidney stones affect 1 in 10 people. And yet most of us only think about our kidneys when something goes catastrophically wrong.
This March, the National Kidney Foundation is asking people to check their kidney health. I'm asking something simpler:
Know what's in your food.
Because the stone you prevent is the surgery you never need, the ER visit that never happens, the PTSD you never develop.
That's worth 31 days of attention. And then some.
~ Tainer, Founder
Want to learn more? Start with our Beginner's Guide to Low-Oxalate Eating or browse the full food database.