questions about pre-op liquid diet

ok have been told i have to do 2-3 weeks of partial liquid diet prior to surgery for the liver but the nutritionist there told me to do the boost glucose to lose the weight. why would she want me to do the one with so many sugars? wouldnt i be better off drinking the ones without sugars to lose the weight? so scared i wont get to where they need me to have surgery done in 5 weeks. any help is appreciated. thanks =)

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