How Much Oxalate Is in Fiber One Cereal?
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 oxalate per 100g matter?
Normalizing to 100 grams removes serving-size differences, so you can judge which food is genuinely denser in oxalate. It matters most when you eat a bigger or smaller portion than the listed serving. Applied to Fiber One Cereal: 34 mg oxalate per 1 serving — Caution per Harvard (2024).
How accurate is the oxalate measurement?
Harvard's 2024 analysis used ion chromatography — the gold standard for oxalate measurement. These are direct lab values, not estimates or database calculations. Variability exists between samples, but this is the most reliable reference available. Applied to Fiber One Cereal: 34 mg oxalate per 1 serving — Caution per Harvard (2024).
How does this compare to other foods?
Anything under 25 mg per serving is Safe; 25-99 mg is Caution; 100 mg or more is Avoid. The category pages on OxalateWatch list foods side by side, so you can see where this one ranks. For context, Fiber One Cereal measures 34 mg per 1 serving, rated Caution.