Comment: I'm betting sugar beets.

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In reply to comment: Are we talking "sugar" (see in situ)

I'm betting sugar beets.

When you see "sugar" listed among the ingredients on American products, it is almost certainly from sugar beets. (And those sugar beets are almost certainly GMOs.) If it were cane sugar, it would say so.

Recommended reading: The Most Dangerous Superstition by Larken Rose