There are a few situations, however, where someone might need to limit their dietary oxalate intake.
If you have recently been on antibiotics, or have a long history of taking antibiotics, your gut flora responsible for metabolizing oxalates has likely been temporarily wiped out or at least compromised. Juicing tubs of spinach when your gut microbiome doesn’t have the ability to deal with it could lead to a serious health problem.
If you have kidney disease, gout or rheumatoid arthritis.
There are also a couple of rare genetic medical conditions where individuals should avoid oxalates.