Is Star Fruit High in Oxalates?

Is Star Fruit High in Oxalates?

If you’re wondering “is star fruit high in oxalates,” here’s the short answer.

Star Fruit contains about 122mg of oxalates per 1 medium fruit (91g). That is considered very high compared to other foods. Star fruit (carambola) has about 122mg of oxalates per fruit. That exceeds the entire daily budget from a single piece of fruit.

To put that in perspective, most kidney stone dietitians recommend staying under 100mg of oxalates per day. A single serving of star fruit uses 122% of that budget.

How Does This Compare?

Star fruit is one of the highest-oxalate fruits, comparable to rhubarb (541mg per half cup cooked). Most other tropical fruits are much lower: mango about 5mg, pineapple about 4mg.

Who Should Watch Their Intake?

Star fruit is particularly dangerous for people with kidney disease. Beyond oxalates, star fruit contains a neurotoxin that healthy kidneys filter out but damaged kidneys cannot. People with any kidney issues should avoid star fruit entirely.

Lower-Oxalate Alternatives

  • Mango (5mg)
  • Pineapple (4mg)
  • Kiwi (low-moderate)
  • Papaya (low)

What Are Oxalates?

Oxalates (oxalic acid) are natural compounds found in many plants. Your body also produces them as a metabolic byproduct. In small amounts, they pass through your system without issues.

The problem starts when oxalate intake is high and calcium intake is low. Oxalates bind to calcium in the kidneys and form calcium oxalate crystals, the most common type of kidney stone. About 80% of kidney stones are calcium oxalate.

How to Reduce Oxalate Absorption

  • Pair high-oxalate foods with calcium. Eating calcium-rich foods (like cheese or yogurt) at the same meal binds oxalates in the gut before they reach the kidneys.
  • Cook your vegetables. Boiling reduces oxalate content by 30-50% because oxalates leach into the water. Steaming helps less.
  • Drink plenty of water. Staying hydrated dilutes oxalate concentration in urine, reducing crystal formation.
  • Spread intake across meals. A moderate-oxalate food at each meal is better than a high-oxalate food all at once.

The Bottom Line

Star Fruit is very high in oxalates. If you have a history of kidney stones or are on a low-oxalate diet, limit or avoid it. There are good alternatives that give you similar nutrition without the oxalate load.

Want Help Building a Diet That Works for You?

Tracking oxalates is just one piece of the puzzle. A health coach can help you build a whole-food eating plan that accounts for oxalates, inflammation, gut health, and your personal goals. Book a free discovery call to get started.

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Disclaimer: Oxalate values are approximate and based on Harvard T.H. Chan School of Public Health. Values can vary by growing conditions, preparation method, and brand. This content is for informational purposes only and does not constitute medical advice. Consult a healthcare provider or registered dietitian for personalized guidance. Last verified March 2026.