Is Chestnut Flour Safe for Kidney Stones? (Safe)
mg oxalate
per serving
Serving: 1/4 cup (21 g)
Verdict: 🟢 Safe
Per 100g: 49 mg
Data: Harvard T.H. Chan SPH (2024)
Here's the takeaway: Chestnut Flour earns a Safe rating (🟢) at 10 mg oxalate per serving. Being under 25 mg means it fits comfortably in everyday eating. Keep your usual habits — adequate fluids and calcium in meals — and Chestnut Flour poses no special concern.
Putting Chestnut Flour in context: it lands well below the category average of 34 mg. In the database, 56% of nuts & seeds (29 of 51) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical nuts & seeds here averages 34 mg oxalate per serving, so Chestnut Flour runs 71% below that baseline. That places it among the lower-oxalate options in its category. Why this matters: the gap between two Safe foods can be wide — one may hold 5 mg oxalate while another sits at 24 mg. The lower one leaves more room in your day. See all nuts & seeds rated Safe for a full side-by-side.
Why does the safe threshold matter?
The 25 mg line is the reference point clinicians use to separate everyday foods from ones that need caution. Every value on this page traces back to Harvard's 2024 lab analysis, so the threshold is applied to measured data rather than estimates. Chestnut Flour comes in at 10 mg oxalate per 1/4 cup (Safe) in the measured database.
Can I eat this food every day?
If it's in the Safe zone (under 25 mg/serving), yes — it can be a regular part of your diet. For Caution or Avoid foods, frequency matters. Rotate them with lower-oxalate options throughout the week. For context, Chestnut Flour measures 10 mg per 1/4 cup, rated Safe.
Where does the oxalate data come from?
Every oxalate figure is sourced from Harvard T.H. Chan SPH (2024), distributed via the OHF database. The values come from actual lab measurements of the foods — not from database averages or estimates. Chestnut Flour comes in at 10 mg oxalate per 1/4 cup (Safe) in the measured database.
Should I also check sodium and calcium?
Yes — kidney stone risk isn't just about oxalate. High sodium increases urinary calcium (a stone promoter). Adequate dietary calcium (from food, not supplements) actually binds oxalate in your gut. Check the food's full nutrition page for the complete picture. Applied to Chestnut Flour: 10 mg oxalate per 1/4 cup — Safe per Harvard (2024).