Is Sweet Potato Soup Safe for Kidney Stones? (Caution)
mg oxalate
per serving
Serving: 1 cup (245 g)
Verdict: 🟡 Caution
Per 100g: 16 mg
Data: Harvard T.H. Chan SPH (2024)
Here's the takeaway: Sweet Potato Soup falls in the Caution band (🟡) at 40 mg oxalate per serving. Not off-limits, but not free — moderate portions, a few times a week at most, and preferably with dairy or another calcium source at the same meal.
Putting Sweet Potato Soup in context: it lands close to the category average of 27 mg. In the database, 80% of vegetables (219 of 271) fall in the 🟢 Safe group (under 25 mg oxalate/serving). The typical vegetables here averages 27 mg oxalate per serving, so Sweet Potato Soup runs 48% above that baseline. That places it on the higher end for oxalate 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 vegetables rated Caution for a full side-by-side.
Why does the safe threshold matter?
The 25 mg cutoff comes from clinical guidance for stone formers. Below it, a food's oxalate contribution is small enough not to move the needle for most patients. Harvard's 2024 lab data sits behind these figures — direct measurements, not estimates. For context, Sweet Potato Soup measures 40 mg per 1 cup, rated Caution.
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 Sweet Potato Soup, the measured oxalate value is 40 mg per 1 cup (Caution).
Where does the oxalate data come from?
Harvard T.H. Chan School of Public Health (2024) via the OHF database. These are direct laboratory measurements — the most reliable oxalate data available for food. Applied to Sweet Potato Soup: 40 mg oxalate per 1 cup — Caution per Harvard (2024).
Should I also check sodium and calcium?
Definitely. Oxalate is only part of the story — high sodium raises calcium in urine, and dietary calcium (from food, not pills) binds oxalate in the gut. The food's main page lists both, so it's worth checking before you plan around it. Sweet Potato Soup comes in at 40 mg oxalate per 1 cup (Caution) in the measured database.