I don't think the sugar in the Beets is much to be concerned about for most diabetics. I'm diabetic and I certainly don't worry about it. Worlds Healthiest Foods offers this warnibg though:
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Beets (notably beet greens) are among a small number of foods that contain measurable amounts of oxalates, naturally-occurring substances found in plants, animals, and human beings. When oxalates become too concentrated in body fluids, they can crystallize and cause health problems. For this reason, individuals with already existing and untreated kidney or gallbladder problems may want to avoid eating beets.
Beets don't grow well here in Florida so fresh ones are quite a delicacy when I can get them. They are also damned expensive and seldom fresh. I'll be keeping my eyes open for them later in the season though, that Borscht looks mighty good.

Good coffee, good weed, and time on my hands...