Robert M. Gary writes:

That's why I never eat or drink anything other than water before the
test. After a meal your blood suger will read higher.

Your blood glucose will be higher, but normally there will be no glucose in
your urine unless you ate a truly massive or very sweet meal. Fasting
shouldn't be necessary if you are not diabetic. However, it certainly doesn't
hurt to fast.

Additionally, drinking water is a good idea, since very concentrated urine may
have more of a trace of protein in it, especially under some circumstances
(such as if you've been recently exercising a lot). Protein will raise
questions, too, if there's more than a trace.

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