Is star fruit high in oxalate?
Yes. Very high, 208 mg per 1 medium fruit
Range 146 to 269 mg across 2 studies, 91 g serving
Lower-oxalate swap: Apple, grade A, about 1.8 mg per 1 medium apple.
Star fruit is high in oxalate: about 208 mg per 1 medium fruit, which is 416% of the 50 mg a day many stone clinics aim for, or 208% of the 100 mg others allow.
If your doctor has put you on a low-oxalate diet, eat it with something high in calcium, like milk, yogurt or cheese. Calcium in the same meal binds oxalate in the gut, so less of it reaches your urine. How much calcium, and what if you don't eat dairy.
50 or 100 mg a day: which target is yours
Why sources disagree on star fruit
The 2 studies here run from 146 to 269 mg per 1 medium fruit, measured between 1982 and 2002. Variety, growing conditions and lab method all move the number. Every one of them lands in grade E.
Where this number comes from
Each row is one published measurement, converted to a 91 g serving (1 medium fruit). The grade and the range use the rows prepared the way the serving is eaten, and take the middle. How the grades work.
| Per serving | Per 100 g | Preparation | Source |
|---|---|---|---|
| 146 mg | 160 mg | Raw | Wilson C.W., Shaw P.E., Knight R.J, 1982via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
| 269 mg | 295.4 mg | Raw (n=4) | Hönow R., Hesse A, 2002via Foods 2023;12:3201, Table 5 (CC BY 4.0) |
By Oliver Silen · Data checked November 2, 2026 · Not medical advice