Is Fiber One Cereal Safe for Kidney Stones? (Caution)
mg oxalate
per serving
Serving: 1 serving (100 g)
Verdict: 🟡 Caution
Per 100g: 63 mg
Data: Harvard T.H. Chan SPH (2024)
In practical terms, Fiber One Cereal sits in the 25-99 mg range with 34 mg per serving, so treat it as a sometimes-food. Keep servings modest, don't stack it with other moderate-oxalate items in one day, and pair it with calcium to blunt absorption.
Among grains & pasta, Fiber One Cereal sits well above the category average of 14 mg. For context, 170 out of 201 grains & pasta (84%) are rated 🟢 Safe (under 25 mg oxalate/serving). The average grains & pasta in our database has 14 mg oxalate per serving — which means Fiber One Cereal is 144% above the category norm. Within its specific category, Fiber One Cereal ranks on the higher end for oxalate. 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 grains & pasta rated Caution to compare within the same verdict level.
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, Fiber One Cereal measures 34 mg per 1 serving, rated Caution.
Can I eat this food every day?
For Safe foods (under 25 mg/serving), daily use is generally fine. Caution and Avoid foods work better as occasional items — rotate them with safer options so no single high-oxalate food becomes a habit. Fiber One Cereal comes in at 34 mg oxalate per 1 serving (Caution) in the measured database.
Where does the oxalate data come from?
The numbers come from Harvard T.H. Chan SPH's 2024 laboratory measurements, published through the OHF database. Direct lab analysis, which is why they're treated as the reference values for food oxalate. For Fiber One Cereal, the measured oxalate value is 34 mg per 1 serving (Caution).
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. For context, Fiber One Cereal measures 34 mg per 1 serving, rated Caution.