The Dr. may be suggesting this due to
the relatively high oxalate content of beets, although I do nt know of any research suggesting that oxalates are unhealthy or should be monitored when eaten in the form of whole plant foods.
Not exact matches
This tuber is
relatively high in protein and provides generous amounts of iron, potassium and vitamin C. Although highly nutritious, oca does contain
oxalates, which can be hard on the kidneys if consumed in large amounts.
The nightshade family includes tomatoes, white potatoes, peppers, and other toxic plants like tobacco and belladonna, all of which contain
relatively high amounts of
oxalates and alkaloids.