🥬 Leafy Greens — 🔴 Oxalate Avoid Foods

Leafy greens hold the widest oxalate spread of any subgroup in the database — a shredded lettuce salad can measure under 2 mg while a half-cup of boiled spinach approaches 500 mg, a difference of more than two hundredfold inside one visually similar food family. The pattern behind the spread: both beet greens and chard carry oxalate at spinach-level concentrations, kale and collards sit in the moderate middle, and the loose-leaf lettuces plus arugula stay near zero. For a stone patient the subgroup rule is simple — the soft, dark, deeply-cooked greens are the portioned ones; the crisp, pale, and raw leaves are the free ones. Boiling and draining the high end changes the math more here than in any other subgroup, because these leaves release soluble oxalate into the water readily.

Vegetables are the widest-oxalate-spread food group in the database: a cucumber measures around 1 mg of oxalate per serving while a half-cup of cooked spinach approaches 493 mg. That spread is why blanket advice like 'eat more vegetables' does not work for stone patients. What matters is the specific leaf, the serving, and the preparation. Boiling and draining can remove a meaningful share of soluble oxalate from many greens, and pairing any higher-oxalate vegetable with a calcium-rich food at the same meal reduces absorption. Low-oxalate anchors in this group include cucumber, lettuce, and most squash varieties; the leafy dark greens are the ones to portion carefully.

This page isolates one slice of a food category: a single verdict within a single subgroup. That granularity matters because categories are rarely uniform — leafy greens, for example, contain both near-zero-oxalate lettuces and very-high-oxalate spinach. Knowing which foods earned the safe, caution, or avoid label within a subgroup lets a stone patient shop with precision instead of avoiding whole food families.

["The avoid label marks foods whose oxalate per standard serving overwhelms a conservative daily budget in one sitting. Two things it does not mean: it is not a statement about the food's general healthfulness, and it is not a permanent ban. It is a price tag. The foods here cost more milligrams than most meals should spend, so the working pattern prices them in deliberately — a small, measured, occasional portion — rather than letting them walk onto the plate by habit.", "For patients who eat here regularly, three checks matter. One: confirm the prepared form — boiling and draining moves many plant foods down a tier or more, and the label can lag behind the method. Two: check the substitute list on each food's page; the database usually contains a near-taste low-oxalate swap. Three: use the 24-hour urine test as the arbiter — urinary oxalate that stays in range despite occasional use of these foods means the current discipline is working, and that conversation belongs with the care team, not with a label."]

This view isolates the Oxalate Avoid slice of Leafy Greens: 6 foods share both the subgroup and the rating, so the oxalate values here are directly comparable for meal planning — no need to mentally adjust for different food families.