How much sugar is too much?

I am two days pre-op and am wondering about this - my surgeon requires a liquid diet (anything that goes through a strainer) for 3 weeks. Baby food (stage one) and low fat yogurt is on the list of things I can have. I looked yesterday and the sugar content was high for the baby fruits and the yogurt - 8 to 17 grams. I didn't buy any - this sounded way too high! Last thing I want to do is dump right after surgery. How much is too much?

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