protein shakes and sugar

The protein shakes I bought for my pre op liquid diet have sugar in them is that alright? The shakes I will be taking post op have hardly no sugar in them. The ones pre op say their high protein shakes (already made up in cans) but they do have more sugar in them than the other ones for post op. I hope their alright to use since I spent all that money on them. What do you think?

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