Oxalate <25 mg/serving
Oxalate 25-99 mg/serving
Oxalate ≥100 mg/serving
📊 Nutrition at a Glance
How the form changes the number: preparation is the real variable across this family. Boiling leaches a meaningful share of soluble oxalate into the cooking water — commonly 30-50% for plant foods — while raw and dry-heat forms keep essentially all of it, so the same base food can land in different brackets depending on how it is cooked. This page tracks Shredded or chopped Lettuce at 3 mg per serving, at the high end of the family. Related forms in this family: Romaine Lettuce (1 mg), Iceberg Lettuce (1 mg).
📏 Oxalate by Serving Size
| Serving | Weight | Oxalate | Verdict |
|---|---|---|---|
| 1 cup, shredded | 56 g | 3 mg | Low Oxalate |
| 2 x 1 cup, shredded | 112 g | 6 mg | Low Oxalate |
| ½ x 1 cup, shredded | 28 g | 1.5 mg | Low Oxalate |
🏷️ Tags
🟢 See all Vegetables rated Safe for kidney stones →
🔗 Related Foods
🟢 Safe alternatives (recommended)
⚠️ Other foods in this category to watch
❓ Frequently Asked Questions
Is Lettuce safe for kidney stones?
No red flags here. Just 3 mg per 1 cup, shredded — well below the 25 mg danger line. You can keep Lettuce in your regular rotation. Data comes from Harvard (2024).
How much oxalate is in Lettuce?
One 1 cup, shredded of Lettuce = 3 mg oxalate. Scale it up to 100g and you're at 5 mg. Direct measurement from Harvard, 2024. About as reliable as food data gets.
Is Lettuce low or high oxalate?
It's low. 3 mg per 1 cup, shredded is well under the 25 mg danger line. Lettuce is not the food you need to worry about.
What can I eat instead of Lettuce?
Don't give up the whole category — just pick a safer member of it. The green foods in the related section all work as substitutes for Lettuce with a fraction of the oxalate.
How much sodium does Lettuce have?
Low sodium: 16 mg/100g. That's a non-issue for kidney stones. Just don't undo it by drowning it in salt during cooking.