Effect of different cooking methods on vegetable oxalate content

Weiwen Chai, Michael Liebman

Research output: Contribution to journalArticlepeer-review

58 Scopus citations


Approximately 75% of all kidney stones are composed primarily of calcium oxalate, and hyperoxaluria is a primary risk factor for this disorder. Nine types of raw and cooked vegetables were analyzed for oxalate using an enzymatic method. There was a high proportion of water-soluble oxalate in most of the tested raw vegetables. Boiling markedly reduced soluble oxalate content by 30-87% and was more effective than steaming (5-53%) and baking (used only for potatoes, no oxalate loss). An assessment of the oxalate content of cooking water used for boiling and steaming revealed an approximately 100% recovery of oxalate losses. The losses of insoluble oxalate during cooking varied greatly, ranging from O to 74%. Because soluble sources of oxalate appear to be better absorbed than insoluble sources, employing cooking methods that significantly reduce soluble oxalate may be an effective strategy for decreasing oxaluria in individuals predisposed to the development of kidney stones.

Original languageEnglish (US)
Pages (from-to)3027-3030
Number of pages4
JournalJournal of Agricultural and Food Chemistry
Issue number8
StatePublished - Apr 20 2005


  • Dietary oxalate
  • Insoluble oxalate
  • Soluble oxalate
  • Vegetables

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)


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