Spinach and other dark, leafy greens can bomb the human body with oxalate, a major causative factor for kidney stones. Stones also predict chronic kidney disease, making them more than an inconvenient pain.
Mitchell et al, Urologists from the University of Alabama-Birmingham, have found that patients with recurrent oxalate kidney stones show impaired monocyte mitochondrial dysfunction in response to stress in vitro. The present study examined this phenomenon in healthy subjects 21 to 31 years of age with no prior history of stones. Blood for monocyte isolation and oxalate levels was drawn before and 5 hours after an oxalate load delivered as a spinach smoothie.
Blood for monocyte isolation and oxalate levels was drawn before and 5 hours after an oxalate load delivered as a spinach smoothie.
As expected, blood and urine oxalate increased after the spinach smoothie. Overall, mitochondrial function decreased after oxalate loading, with ~60% of participants showing responses similar to the stone-forming population. The remaining participants had preserved monocyte mitochondrial function.
So oxalate may impair monocyte function in people. Could the 60% with abnormal responses represent future stone-formers? Are these the ones more predisposed to chronic kidney disease after stones? Only time will tell.
In the meantime, I plan to avoid green smoothies on principle. And disgust...lots of disgust.
For abstract, click link on author names above.