How Much Sodium Is in Flour?
mg oxalate
per serving
Serving: 1/4 cup (21 g)
Verdict: 🟢 Safe
Per 100g: 49 mg
Data: Harvard T.H. Chan SPH (2024)
What this means: Flour is rated Safe (🟢). At 10 mg oxalate per serving, it's well under the 25 mg safety threshold. You can include it regularly in a kidney stone diet. Pair it with calcium-rich foods (dairy, fortified plant milks) for additional protection, and drink plenty of water throughout the day.
Among nuts & seeds, Flour sits well below the category average of 36 mg. For context, 29 out of 51 nuts & seeds (56%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average nuts & seeds in our database has 36 mg oxalate per serving — which means Flour is 72% below the category norm. Within its specific category, Flour ranks among the lower-oxalate options. This context matters because two 'Safe' foods can have very different oxalate levels — one might have 5 mg while another has 24 mg. Both are Safe, but the first gives you more dietary flexibility. Browse all nuts & seeds rated Safe to compare within the same verdict level.
How does sodium affect kidney stones?
High sodium intake increases calcium in urine (hypercalciuria), which raises the risk of calcium-based kidney stones. The general recommendation is under 2,300 mg/day — lower if you're actively preventing stones.
What's a safe daily sodium target?
Aim for under 2,000-2,300 mg per day. Check labels on packaged foods — sodium adds up quickly. Cooking at home with fresh ingredients gives you the most control over sodium intake.
How do I reduce sodium when eating out?
Ask for sauces and dressings on the side. Choose grilled/steamed over fried. Skip the soup (often very high sodium). Request no added salt. These small changes make a measurable difference.