Rhubarb is rich in oxalates....the overabundance of oxalic acid in the leaves make them poisonous to most critters.
Another kidney stone source is calcium phosphate. The calcium is a "good guy" and comes from a variety of foods, especially dark green veggies (NOT including iceberg lettuce,which is free of most nutrients). But if you use a lot of dairy products and a lot of carbonated soft drinks, the phosphoric acid from the carbonated beverage combines with the excess calcium to form the nearly-insoluble calcium phosphate (looks like boiler scale) and it can precipitate out in your urine as a stone.
It happened to a close friend (he consumed a lot of milk and Pepsi colas). He had symptoms that match those of acute appendicitis and I rushed him to a hospital emergency room where they discovered and treated his passing kidney stone.
This was in the 60's and the they used to remove it gives me chills. Any male who's ever had a urinal catheter inserted would know.
Thanks for that info.
that was my answer - too much soda pop and too little water. Iced tea being a diuretic can’t substitute for hydrating with plain ‘ole water. Greens as a contributor make sense, too, since greens are a big part of a traditional southern diet.