one thing i could do, though, if i'm worried specifically about oxalates in the salad bowl, is to add kale instead of spinach. kale is actually much higher in lutein, much lower in oxalates and a little higher in k. if i end up keeping a smaller amount of beet for potassium and tooth function, i could recover some betaine that way.
for now, i have some spinach to eat up...
let me add up the potassium numbers first and see where i'm at.